What is Baclofen Injection and how is it used?
Baclofen Injection is a prescription medicine used to treat the symptoms of Spasticity, Muscle Pain, and Stiffness. Baclofen Injection may be used alone or with other medications.
Baclofen Injection belongs to a class of drugs called Skeletal Muscle Relaxants.
It is not known if Baclofen Injection is safe and effective in children younger than 12 years of age.
What are the possible side effects of Baclofen Injection?
Baclofen Injection may cause serious side effects including:
- difficulty breathing,
- swelling of your face, lips, tongue, or throat,
- severe drowsiness,
- weak or shallow breathing,
- itching, tingling, or twitching in your hands, arms, feet, or legs,
- fever, and
Get medical help right away, if you have any of the symptoms listed above.
The most common side effects of Baclofen Injection include:
- sleep problems (insomnia),
- constipation, and
- urinating more often than usual
Tell the doctor if you have any side effect that bothers you or that does not go away.
These are not all the possible side effects of Baclofen Injection. For more information, ask your doctor or pharmacist.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Abrupt discontinuation of intrathecal baclofen, regardless of the cause, has resulted in sequelae that include high fever, altered mental status, exaggerated rebound spasticity, and muscle rigidity, that in rare cases has advanced to rhabdomyolysis, multiple organ-system failure and death.
Prevention of abrupt discontinuation of intrathecal baclofen requires careful attention to programming and monitoring of the infusion system, refill scheduling and procedures, and pump alarms. Patients and caregivers should be advised of the importance of keeping scheduled refill visits and should be educated on the early symptoms of baclofen withdrawal. Special attention should be given to patients at apparent risk (e.g. spinal cord injuries at T-6 or above, communication difficulties, history of withdrawal symptoms from oral or intrathecal baclofen). Consult the technical manual of the implantable infusion system for additional postimplant clinician and patient information (see WARNINGS).
Baclofen Injection (Intrathecal) is a muscle relaxant and antispastic. Its chemical name is 4- amino- 3-(4- chlorophenyl) butanoic acid, and its structural formula is:
Baclofen is a white to off-white, odorless or practically odorless crystalline powder, with a molecular weight of 213.66. It is slightly soluble in water, very slightly soluble in methanol, and insoluble in chloroform.
Baclofen Injection (Intrathecal) is a sterile, pyrogen-free, isotonic solution free of antioxidants, preservatives or other potentially neurotoxic additives indicated only for intrathecal administration. The drug is stable in solution at 37° C and compatible with CSF. Each milliliter of Baclofen Injection (Intrathecal) contains baclofen 50 mcg, 500 mcg or 2000 mcg and sodium chloride 8.8 mg in Water for Injection; pH range is 5.5-6.8. Each ampule is intended for SINGLE USE ONLY. Discard any unused portion. DO NOT AUTOCLAVE.
Baclofen Injection (Intrathecal) is indicated for use in the management of severe spasticity. Patients should first respond to a screening dose of intrathecal baclofen prior to consideration for long term infusion via an implantable pump. For spasticity of spinal cord origin, chronic infusion of Baclofen Injection (Intrathecal) via an implantable pump should be reserved for patients unresponsive to oral baclofen therapy, or those who experience intolerable CNS side effects at effective doses. Patients with spasticity due to traumatic brain injury should wait at least one year after the injury before consideration of long term intrathecal baclofen therapy. Baclofen Injection (Intrathecal) is intended for use by the intrathecal route in single bolus test doses (via spinal catheter or lumbar puncture) and, for chronic use, only in implantable pumps approved by the FDA specifically for the administration of Baclofen Injection (Intrathecal) into the intrathecal space.
Spasticity of Spinal Cord Origin
Evidence supporting the efficacy of intrathecal baclofen was obtained in randomized, controlled investigations that compared the effects of either a single intrathecal dose or a three day intrathecal infusion of intrathecal baclofen to placebo in patients with severe spasticity and spasms due to either spinal cord trauma or multiple sclerosis. Intrathecal baclofen was superior to placebo on both principal outcome measures employed: change from baseline in the Ashworth rating of spasticity and the frequency of spasms.
Spasticity of Cerebral Origin
The efficacy of intrathecal baclofen was investigated in three controlled clinical trials; two enrolled patients with cerebral palsy and one enrolled patients with spasticity due to previous brain injury. The first study, a randomized controlled cross-over trial of 51 patients with cerebral palsy, provided strong, statistically significant results; intrathecal baclofen was superior to placebo in reducing spasticity as measured by the Ashworth Scale. A second cross-over study was conducted in 11 patients with spasticity arising from brain injury. Despite the small sample size, the study yielded a nearly significant test statistic (p=0.066) and provided directionally favorable results. The last study, however, did not provide data that could be reliably analyzed. Baclofen Injection (Intrathecal) therapy may be considered an alternative to destructive neurosurgical procedures. Prior to implantation of a device for chronic intrathecal infusion of Baclofen Injection (Intrathecal), patients must show a response to Baclofen Injection (Intrathecal) in a screening trial (see DOSAGE AND ADMINISTRATION).
DOSAGE AND ADMINISTRATION
Refer to the manufacturer's manual for the implantable pump approved for intrathecal infusion for specific instructions and precautions for programming the pump and/ or refilling the reservoir. There are various pumps with varying reservoir volumes and there are various refill kits available. It is important to be familiar with all of these products in order to select the appropriate refill kit for the particular pump in use.
Prior to pump implantation and initiation of chronic infusion of Baclofen Injection (Intrathecal), patients must demonstrate a positive clinical response to a Baclofen Injection (Intrathecal) bolus dose administered intrathecally in a screening trial. The screening trial employs Baclofen Injection (Intrathecal) at a concentration of 50 mcg/mL. A 1 mL ampule (50 mcg/mL) is available for use in the screening trial. The screening procedure is as follows. An initial bolus containing 50 micrograms in a volume of 1 milliliter is administered into the intrathecal space by barbotage over a period of not less than one minute. The patient is observed over the ensuing 4 to 8 hours. A positive response consists of a significant decrease in muscle tone and/or frequency and/or severity of spasms. If the initial response is less than desired, a second bolus injection may be administered 24 hours after the first. The second screening bolus dose consists of 75 micrograms in 1.5 milliliters. Again, the patient should be observed for an interval of 4 to 8 hours. If the response is still inadequate, a final bolus screening dose of 100 micrograms in 2 milliliters may be administered 24 hours later.
The starting screening dose for pediatric patients is the same as in adult patients, i.e., 50 mcg. However, for very small patients, a screening dose of 25 mcg may be tried first. Patients who do not res pond to a 100 mcg intrathecal bolus should not be considered candidates for an implanted pump for chronic infusion.
Post-Implant Dose Titration Period
To determine the initial total daily dose of Baclofen Injection (Intrathecal) following implant, the screening dose that gave a positive effect should be doubled and administered over a 24-hour period, unless the efficacy of the bolus dose was maintained for more than 8 hours, in which case the starting daily dose should be the screening dose delivered over a 24-hour period. No dose increases should be given in the first 24 hours (i.e., until the steady state is achieved).
Adult Patients With Spasticity Of Spinal Cord Origin
After the first 24 hours, for adult patients, the daily dosage should be increased slowly by 10 to 30% increments and only once every 24 hours, until the desired clinical effect is achieved.
Adult Patients With Spasticity Of Cerebral Origin
After the first 24 hours, the daily dose should be increased slowly by 5 to 15% only once every 24 hours, until the desired clinical effect is achieved.
After the first 24 hours, the daily dose should be increased slowly by 5 to 15% only once every 24 hours, until the desired clinical effect is achieved. If there is not a substantive clinical response to increases in the daily dose, check for proper pump function and catheter patency. Patients must be monitored closely in a fully equipped and staffed environment during the screening phase and dose- titration period immediately following implant. Resuscitative equipment should be immediately available for use in case of life- threatening or intolerable side effects.
Spasticity Of Spinal Cord Origin Patients
The clinical goal is to maintain muscle tone as close to normal as possible, and to minimize the frequency and severity of spasms to the extent possible, without inducing intolerable side effects. Very often, the maintenance dose needs to be adjusted during the first few months of therapy while patients adjust to changes in life style due to the alleviation of spasticity. During periodic refills of the pump, the daily dose may be increased by 10 to 40%, but no more than 40%, to maintain adequate symptom control. The daily dose may be reduced by 10 to 20% if patients experience side effects. Most patients require gradual increases in dose over time to maintain optimal response during chronic therapy. A sudden large requirement for dose escalation suggests a catheter complication (i.e., catheter kink or dislodgement). Maintenance dosage for long term continuous infusion of Baclofen Injection (Intrathecal) has ranged from 12 mcg/day to 2003 mcg/day, with most patients adequately maintained on 300 micrograms to 800 micrograms per day. There is limited experience with daily doses greater than 1000 mcg/day. Determination of the optimal Baclofen Injection (Intrathecal) dose requires individual titration. The lowest dose with an optimal response should be used.
Spasticity Of Cerebral Origin Patients
The clinical goal is to maintain muscle tone as close to normal as possible and to minimize the frequency and severity of spasms to the extent possible, without inducing intolerable side effects, or to titrate the dose to the desired degree of muscle tone for optimal functions. Very often the maintenance dose needs to be adjusted during the first few months of therapy while patients adjust to changes in life style due to the alleviation of spasticity. During periodic refills of the pump, the daily dose may be increased by 5 to 20%, but no more than 20%, to maintain adequate symptom control. The daily dose may be reduced by 10 to 20% if patients experience side effects. Many patients require gradual increases in dose over time to maintain optimal response during chronic therapy. A sudden large requirement for dose escalation suggests a catheter complication (i.e., catheter kink or dislodgement). Maintenance dosage for long term continuous infusion of Baclofen Injection (Intrathecal) has ranged from 22 mcg/day to 1400 mcg/day, with most patients adequately maintained on 90 micrograms to 703 micrograms per day. In clinical trials, only 3 of 150 patients required daily doses greater than 1000 mcg/day.
Use same dosing recommendations for patients with spasticity of cerebral origin. Pediatric patients under 12 years seemed to require a lower daily dose in clinical trials. Average daily dose for patients under 12 years was 274 mcg/day, with a range of 24 to 1199 mcg/day. Dosage requirement for pediatric patients over 12 years does not seem to be different from that of adult patients. Determination of the optimal Baclofen Injection (Intrathecal) dose requires individual titration. The lowest dose with an optimal response should be used.
Potential Need For Dose Adjustments In Chronic Use
During long term treatment, approximately 5% (28/627) of patients become refractory to increasing doses. There is not sufficient experience to make firm recommendations for tolerance treatment; however, this “tolerance” has been treated on occasion, in hospital, by a “drug holiday” consisting of the gradual reduction of Baclofen Injection (Intrathecal) over a 2 to 4 week period and switching to alternative methods of spasticity management. After the “drug holiday”, Baclofen Injection (Intrathecal) may be restarted at the initial continuous infusion dose.
Parenteral drug products should be inspected for particulate matter and discoloration prior to administration, whenever solution and container permit.
The specific concentration that should be used depends upon the total daily dose required as well as the delivery rate of the pump. Baclofen Injection (Intrathecal) may require dilution when used with certain implantable pumps. Please consult manufacturer's manual for specific recommendations.
Use the 1 mL screening ampule only (50 mcg/mL) for bolus injection into the subarachnoid space. For a 50 mcg bolus dose, use 1 mL of the screening ampule. Use 1.5 mL of 50 mcg/mL baclofen injection for a 75 mcg bolus dose. For the maximum screening dose of 100 mcg, use 2 mL of 50 mcg/mL baclofen injection (2 screening ampules).
For patients who require concentrations other than 500 mcg/mL or 2000 mcg/mL, Baclofen Injection (Intrathecal) must be diluted. Baclofen Injection (Intrathecal) must be diluted with sterile preservative free Sodium Chloride for Injection, U.S.P.
Baclofen Injection (Intrathecal) is most often administered in a continuous infusion mode immediately following implant. For those patients implanted with programmable pumps who have achieved relatively satisfactory control on continuous infusion, further benefit may be attained using more complex schedules of Baclofen Injection (Intrathecal) delivery. For example, patients who have increased spasms at night may require a 20% increase in their hourly infusion rate. Changes in flow rate should be programmed to start two hours before the time of desired clinical effect.
Baclofen Injection (Intrathecal) is packaged in single use ampules of 0.05 mg/mL (50 mcg/mL), 10 mg/20 mL (500 mcg/mL) or 40 mg/20 mL (2000 mcg/mL) supplied as follow:
Screening dose: Baclofen Injection (Intrathecal) 0.05 mg/mL (50 mcg/mL) in shelf carton of 10 ampules
Baclofen Injection (Intrathecal) 10 mg/20 mL (500 mcg/mL) in individual packaging of 1 ampule
Baclofen Injection (Intrathecal) 40 mg/20 mL (2000 mcg/mL) in individual packaging of 1 ampule
Does not require refrigeration.
Store at 20° to 25°C (68° to 77°F) [See USP controlled room temperature].
Do not freeze.
Do not heat sterilize.
Manufactured by Sintetica SA, Mendrisio, Switzerland. Revised: May 2016
Adverse Drug Events
Spasticity Of Spinal Cord Origin
Commonly Observed in Patients with Spasticity of Spinal Origin: In pre- and post-marketing clinical trials, the most commonly observed adverse events associated with use of intrathecal baclofen which were not seen at an equivalent incidence among placebo-treated patients were: somnolence, dizziness, nausea, hypotension, headache, convulsions and hypotonia.
Associated with Discontinuation of Treatment: 8/474 patients with spasticity of spinal cord origin receiving long term infusion of intrathecal baclofen in pre- and post-marketing clinical studies in the U.S. discontinued treatment due to adverse events. These include: pump pocket infections (3), meningitis (2), wound dehiscence (1), gynecological fibroids (1) and pump overpressurization (1) with unknown, if any, sequela. Eleven patients who developed coma secondary to overdose had their treatment temporarily suspended, but all were subsequently re-started and were not, therefore, considered to be true discontinuations.
Fatalities: See WARNINGS
Incidence in Controlled Trials: Experience with intrathecal baclofen obtained in parallel, placebocontrolled, randomized studies provides only a limited basis for estimating the incidence of adverse events because the studies were of very brief duration (up to three days of infusion) and involved only a total of 63 patients. The following events occurred among the 31 patients receiving intrathecal baclofen in two randomized, placebo-controlled trials: hypotension (2), dizziness (2), headache (2), dyspnea (1). No adverse events were reported among the 32 patients receiving placebo in these studies. Events Observed during the Pre- and Post- marketing Evaluation of Intrathecal Baclofen: Adverse events associated with the use of intrathecal baclofen reflect experience gained with 576 patients followed prospectively in the United States. They received intrathecal baclofen for periods of one day (screening) (N = 576) to over eight years (maintenance) (N = 10). The usual screening bolus dose administered prior to pump implantation in these studies was typically 50 mcg. The maintenance dose ranged from 12 mcg to 2003 mcg per day. Because of the open, uncontrolled nature of the experience, a causal linkage between events observed and the administration of intrathecal baclofen cannot be reliably assessed in many cases and many of the adverse events reported are known to occur in association with the underlying conditions being treated. Nonetheless, many of the more commonly reported reactions - hypotonia, somnolence, dizziness, paresthesia, nausea/vomiting and headache - appear clearly drugrelated. Adverse experiences reported during all U.S. studies (both controlled and uncontrolled) are shown in the following table. Eight of 474 patients who received chronic infusion via implanted pumps had adverse experiences which led to a discontinuation of long term treatment in the pre- and postmarketing studies.
INCIDENCE OF MOST
FREQUENT ( ≥ 1%) ADVERSE EVENTS IN PATIENTS WITH SPASTICITY OF SPINAL
ORIGIN IN PROSPECTIVELY MONITORED CLINICAL TRIALS
|Percent of Patients Reporting Events|
|N = 576
|N = 474
|N = 430
|Nausea and Vomiting||1.6||2.3||5.6|
|aFollowing administration of test bolus
bTwo month period following implant
cBeyond two months following implant
N = total number of patients entering each period
% = % of patients evaluated
In addition to the more common (1% or more) adverse events reported in the prospectively followed 576 domestic patients in pre- and post-marketing studies, experience from an additional 194 patients exposed to intrathecal baclofen from foreign studies has been reported. The following adverse events, not described in the table, and arranged in decreasing order of frequency, and classified by body system, were reported:
Nervous System: Abnormal gait, thinking abnormal, tremor, amnesia, twitching, vasodilitation, cerebrovascular accident, nystagmus, personality disorder, psychotic depression, cerebral ischemia, emotional lability, euphoria, hypertonia, ileus, drug dependence, incoordination, paranoid reaction and ptosis.
Urogenital: Hematuria and kidney failure.
Skin and Appendages : Alopecia and sweating.
Body as a Whole: Suicide, lack of drug effect, abdominal pain, hypothermia, neck rigidity, chest pain, chills, face edema, flu syndrome and overdose.
Hemic and Lymphatic System: Anemia
Spasticity Of Cerebral Origin
Commonly Observed: In pre-marketing clinical trials, the most commonly observed adverse events associated with use of intrathecal baclofen which were not seen at an equivalent incidence among placebo-treated patients included: agitation, constipation, somnolence, leukocytosis, chills, urinary retention and hypotonia.
Associated with Discontinuation of Treatment: Nine of 211 patients receiving intrathecal baclofen in premarketing clinical studies in the U.S. discontinued long term infusion due to adverse events associated with intrathecal therapy. The nine adverse events leading to discontinuation were: infection (3), CSF leaks (2), meningitis (2), drainage (1), and unmanageable trunk control (1).
Fatalities: Three deaths, none of which were attributed to intrathecal baclofen, were reported in patients in clinical trials involving patients with spasticity of cerebral origin. See WARNINGS on other deaths reported in spinal spasticity patients.
Incidence in Controlled Trials: Experience with intrathecal baclofen obtained in parallel, placebocontrolled, randomized studies provides only a limited basis for estimating the incidence of adverse events because the studies involved a total of 62 patients exposed to a single 50 mcg intrathecal bolus. The following events occurred among the 62 patients receiving intrathecal baclofen in two randomized, placebo-controlled trials involving cerebral palsy and head injury patients, respectively: agitation, constipation, somnolence, leukocytosis, nausea, vomiting, nystagmus, chills, urinary retention, and hypotonia.
Events Observed during the Pre- marketing Evaluation of Intrathecal Baclofen: Adverse events associated with the use of intrathecal baclofen reflect experience gained with a total of 211 U.S. patients with spasticity of cerebral origin, of whom 112 were pediatric patients (under age 16 at enrollment). They received intrathecal baclofen for periods of one day (screening) (N= 211) to 84 months (maintenance) (N= 1). The usual screening bolus dose administered prior to pump implantation in these studies was 50 to 75 mcg. The maintenance dose ranged from 22 mcg to 1400 mcg per day. Doses used in this patient population for long term infusion are generally lower than those required for patients with spasticity of spinal cord origin. Because of the open, uncontrolled nature of the experience, a causal linkage between events observed and the administration of intrathecal baclofen cannot be reliably assessed in many cases. Nonetheless, many of the more commonly reported reactions - somnolence, dizziness, headache, nausea, hypotension, hypotonia and coma - appear clearly drug-related. The most frequent (Ã¢â€°Â¥1%) adverse events reported during all clinical trials are shown in the following table. Nine patients discontinued long term treatment due to adverse events.
INCIDENCE OF MOST
FREQUENT ( ≥ 1%) ADVERSE EVENTS IN PATIENTS WITH SPASTICITY OF CEREBRAL
ORIGIN IN PROSPECTIVELY MONITORED CLINICAL TRIALS
|Percent of Patients Reporting Events|
|N = 211
|N = 153
|N = 150
|Nausea and Vomiting||6.6||10.5||4.0|
|aFollowing administration of test bolus
bTwo month period following implant
cBeyond two months following implant
N = total number of patients entering each period. 211 patients received drug; 1 of 212 received placebo only.
% = % of patients evaluated
The more common (1% or more) adverse events reported in the prospectively followed 211 patients exposed to intrathecal baclofen have been reported. In the total cohort, the following adverse events, not described in the table, and arranged in decreasing order of frequency, and classified by body system, were reported:
Respiratory: Apnea, dyspnea and hyperventilation.
Skin and Appendages : Rash, sweating, alopecia, contact dermatitis and skin ulcer.
Special Senses : Abnormality of accommodation.
Hemic and Lymphatic System: Leukocytosis and petechial rash.
There is inadequate systematic experience with the use of Baclofen Injection (Intrathecal) in combination with other medications to predict specific drug-drug interactions. Interactions attributed to the combined use of Baclofen Injection (Intrathecal) and epidural morphine include hypotension and dyspnea.
Baclofen Injection (Intrathecal) is for use in single bolus intrathecal injections (via a catheter placed in the lumbar intrathecal space or injection by lumbar puncture) and in implantable pumps approved by the FDA specifically for the intrathecal administration of baclofen. Because of the possibility of potentially life- threatening CNS depression, cardiovascular collapse, and/ or respiratory failure, physicians must be adequately trained and educated in chronic intrathecal infusion therapy. The pump system should not be implanted until the patient's response to bolus Baclofen Injection (Intrathecal) is adequately evaluated. Evaluation (consisting of a screening procedure: see DOSAGE AND ADMINISTRATION) requires that Baclofen Injection (Intrathecal) be administered into the intrathecal space via a catheter or lumbar puncture. Because of the risks associated with the screening procedure and the adjustment of dosage following pump implantation, these phases must be conducted in a medically supervised and adequately equipped environment following the instructions outlined in the Dosage and Administration section.
Resuscitative Equipment Should Be Available
Following surgical implantation of the pump, particularly during the initial phases of pump use, the patient should be monitored closely until it is certain that the patient's response to the infusion is acceptable and reasonably stable. On each occasion that the dosing rate of the pump and/ or the concentration of Baclofen Injection (Intrathecal) in the reservoir is adjusted, close medical monitoring is required until it is certain that the patient's response to the infusion is acceptable and reasonably stable. It is mandatory that the patient, all patient caregivers, and the physicians responsible for the patient receive adequate information regarding the risks of this mode of treatment. All medical personnel and caregivers should be instructed in 1) the signs and symptoms of overdose, 2) procedures to be followed in the event of overdose and 3) proper home care of the pump and insertion site.
Signs of overdose may appear suddenly or insidiously. Acute massive overdose may present as coma. Less sudden and/ or less severe forms of overdose may present with signs of drowsiness, lightheadedness, dizziness, somnolence, respiratory depression, seizures, rostral progression of hypotonia and loss of consciousness progressing to coma. Should overdose appear likely, the patient should be taken immediately to a hospital for assessment and emptying of the pump reservoir. In cases reported to date, overdose has generally been related to pump malfunction, inadvertent subcutaneous injection, or dosing error. (See Drug Overdose Symptoms and Treatment.) Extreme caution must be used when filling an FDA approved implantable pump. Such pumps should only be refilled through the reservoir refill septum. Inadvertent injection into the subcutaneous tissue can occur if the reservoir refill septum is not properly accessed. Some pumps are also equipped with a catheter access port that allows direct access to the intrathecal catheter. Direct injection into this catheter access port or inadvertent injection into the subcutaneous tissue may cause a life-threatening overdose.
Abrupt withdrawal of intrathecal baclofen, regardless of the cause, has resulted in sequelae that included high fever, altered mental status, exaggerated rebound spasticity and muscle rigidity that in rare cases progressed to rhabdomyolysis, multiple organ-system failure, and death. In the first 9 years of post-marketing experience, 27 cases of withdrawal temporally related to the cessation of baclofen therapy were reported; six patients died. In most cases, symptoms of withdrawal appeared within hours to a few days following interruption of baclofen therapy. Common reasons for abrupt interruption of intrathecal baclofen therapy included malfunction of the catheter (especially disconnection), low volume in the pump reservoir, and end of pump battery life; human error may have played a causal or contributing role in some cases. Cases of intrathecal mass at the tip of the implanted catheter leading to withdrawal symptoms have also been reported, most of them involving pharmacy compounded analgesic admixtures (see PRECAUTIONS). Prevention of abrupt discontinuation of intrathecal baclofen requires careful attention to programming and monitoring of the infusion system, refill scheduling and procedures, and pump alarms. Patients and caregivers should be advised of the importance of keeping scheduled refill visits and should be educated on the early symptoms of baclofen withdrawal. All patients receiving intrathecal baclofen therapy are potentially at risk for withdrawal. Early symptoms of baclofen withdrawal may include return of baseline spasticity, pruritus, hypotension, and paresthesias. Some clinical characteristics of the advanced intrathecal baclofen withdrawal syndrome may resemble autonomic dysreflexia, infection (sepsis), malignant hyperthermia, neurolepticmalignant syndrome, or other conditions associated with a hypermetabolic state or widespread rhabdomyolysis. Rapid, accurate diagnosis and treatment in an emergency-room or intensive- care setting are important in order to prevent the potentially life-threatening central nervous system and systemic effects of intrathecal baclofen withdrawal. The suggested treatment for intrathecal baclofen withdrawal is the restoration of intrathecal baclofen at or near the same dosage as before therapy was interrupted. However, if restoration of intrathecal delivery is delayed, treatment with GABA-ergic agonist drugs such as oral or enteral baclofen, or oral, enteral, or intravenous benzodiazepines may prevent potentially fatal sequelae. Oral or enteral baclofen alone should not be relied upon to halt the progression of intrathecal baclofen withdrawal. Seizures have been reported during overdose and with withdrawal from intrathecal baclofen as well as in patients maintained on therapeutic doses of intrathecal baclofen.
Spasticity Of Spinal Cord Origin
There were 16 deaths reported among the 576 U.S. patients treated with intrathecal baclofen in pre- and post- marketing studies evaluated as of December 1992. Because these patients were treated under uncontrolled clinical settings, it is impossible to determine definitively what role, if any, intrathecal baclofen played in their deaths. As a group, the patients who died were relatively young (mean age was 47 with a range from 25 to 63), but the majority suffered from severe spasticity of many years duration, were nonambulatory, had various medical complications such as pneumonia, urinary tract infections, and decubiti, and/ or had received multiple concomitant medications. A case- by- case review of the clinical course of the 16 patients who died failed to reveal any unique signs, symptoms, or laboratory results that would suggest that treatment with intrathecal baclofen caused their deaths. Two patients, however, did suffer sudden and unexpected death within 2 weeks of pump implantation and one patient died unexpectedly after screening. One patient, a 44 year-old male with MS, died in hospital on the second day following pump implantation. An autopsy demonstrated severe fibrosis of the coronary conduction system. A second patient, a 52 year-old woman with MS and a history of an inferior wall myocardial infarction, was found dead in bed 12 days after pump implantation, 2 hours after having had documented normal vital signs. An autopsy revealed pulmonary congestion and bilateral pleural effusions. It is impossible to determine whether intrathecal baclofen contributed to these deaths. The third patient underwent three baclofen screening trials. His medical history included SCI, aspiration pneumonia, septic shock, disseminated intravascular coagulopathy, severe metabolic acidosis, hepatic toxicity, and status epilepticus. Twelve days after screening (he was not implanted), he again experienced status epilepticus with subsequent significant neurological deterioration. Based upon prior instruction, extraordinary resuscitative measures were not pursued and the patient died.
Spasticity Of Cerebral Origin
There were three deaths occurring among the 211 patients treated with intrathecal baclofen in pre- marketing studies as of March 1996. These deaths were not attributed to the therapy.
Children should be of sufficient body mass to accommodate the implantable pump for chronic infusion. Please consult pump manufacturer's manual for specific recommendations. Safety and effectiveness in pediatric patients below the age of 4 have not been established.
Patients should be infection-free prior to the screening trial with Baclofen Injection (Intrathecal) because the presence of a systemic infection may interfere with an assessment of the patient's response to bolus Baclofen Injection (Intrathecal).
Patients should be infection-free prior to pump implantation because the presence of infection may increase the risk of surgical complications. Moreover, a systemic infection may complicate dosing.
Pump Dose Adjustment And Titration
In most patients, it will be necessary to increase the dose gradually over time to maintain effectiveness; a sudden requirement for substantial dose escalation typically indicates a catheter complication (i. e., catheter kink or dislodgement). Reservoir refilling must be performed by fully trained and qualified personnel following the directions provided by the pump manufacturer. Inadvertent injection into the subcutaneous tissue can occur if the reservoir refill septum is not properly accessed. Subcutaneous injection may result in symptoms of a systemic overdose or early depletion of the reservoir. Refill intervals should be carefully calculated to prevent depletion of the reservoir, as this would result in the return of severe spasticity and possibly symptoms of withdrawal. Strict aseptic technique in filling is required to avoid bacterial contamination and serious infection. A period of observation appropriate to the clinical situation should follow each refill or manipulation of the drug reservoir.
Extreme caution must be used when filling an FDA approved implantable pump equipped with an injection port that allows direct access to the intrathecal catheter. Direct injection into the catheter through the catheter access port may cause a life-threatening overdose.
Additional Considerations Pertaining To Dos Age Adjustment
It may be important to titrate the dose to maintain some degree of muscle tone and allow occasional spasms to: 1) help support circulatory function, 2) possibly prevent the formation of deep vein thrombosis, 3) optimize activities of daily living and ease of care. Except in overdose related emergencies, the dose of Baclofen Injection (Intrathecal) should ordinarily be reduced slowly if the drug is discontinued for any reason. An attempt should be made to discontinue concomitant oral antispasticity medication to avoid possible overdose or adverse drug interactions, either prior to screening or following implant and initiation of chronic Baclofen Injection (Intrathecal) infusion. Reduction and discontinuation of oral anti-spasmotics should be done slowly and with careful monitoring by the physician. Abrupt reduction or discontinuation of concomitant antispastics should be avoided.
Drowsiness has been reported in patients on intrathecal baclofen. Patients should be cautioned regarding the operation of automobiles or other dangerous machinery, and activities made hazardous by decreased alertness. Patients should also be cautioned that the central nervous system depressant effects of Baclofen Injection (Intrathecal) may be additive to those of alcohol and other CNS depressants.
Cases of intrathecal mass at the tip of the implanted catheter have been reported, most of them involving pharmacy compounded analgesic admixtures. The most frequent symptoms associated with intrathecal mass are: 1) decreased therapeutic response (worsening spasticity, return of spasticity when previously well controlled, withdrawal symptoms, poor response to escalating doses, or frequent or large dosage increases), 2) pain, 3) neurological deficit/dysfunction. Clinicians should monitor patients on intraspinal therapy carefully for any new neurological signs or symptoms. In patients with new neurological signs or symptoms suggestive of an intrathecal mass, consider a neurosurgical consultation, since many of the symptoms of inflammatory mass are not unlike the symptoms experienced by patients with severe spasticity from their disease. In some cases, performance of an imaging procedure may be appropriate to confirm or rule-out the diagnosis of an intrathecal mass.
Precautions In Special Patient Populations
Careful dose titration of Baclofen Injection (Intrathecal) is needed when spasticity is necessary to sustain upright posture and balance in locomotion or whenever spasticity is used to obtain optimal function and care. Patients suffering from psychotic disorders, schizophrenia, or confusional states should be treated cautiously with Baclofen Injection (Intrathecal) and kept under careful surveillance, because exacerbations of these conditions have been observed with oral administration. Baclofen Injection (Intrathecal) should be used with caution in patients with a history of autonomic dys- reflexia. The presence of nociceptive stimuli or abrupt withdrawal of Baclofen Injection (Intrathecal) may cause an autonomic dysreflexic episode. Because baclofen is primarily excreted unchanged by the kidneys, it should be given with caution in patients with impaired renal function and it may be necessary to reduce the dosage.
No specific laboratory tests are deemed essential for the management of patients on Baclofen Injection (Intrathecal).
Carcinogenesis, Mutagenesis, And Impairment Of Fertility
No increase in tumors was seen in rats receiving baclofen (baclofen USP) orally for two years at approximately 30 to 60 times on a mg/kg basis, or 10 to 20 times on a mg/m² basis, the maximum oral dose recommended for human use. Mutagenicity assays with baclofen have not been performed.
Pregnancy Category C
Baclofen (baclofen USP) given orally has been shown to increase the incidence of omphaloceles (ventral hernias) in fetuses of rats given approximately 13 times on a mg/kg basis, or 3 times on a mg/m² basis, the maximum oral dose recommended for human use; this dose also caused reductions in food intake and weight gain in the dams. This abnormality was not seen in mice or rabbits. There are no adequate and well-controlled studies in pregnant women. Baclofen should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
In mothers treated with oral baclofen (baclofen USP) in therapeutic doses, the active substance passes into the breast milk. It is not known whether detectable levels of drug are present in breast milk of nursing mothers receiving intrathecal baclofen. As a general rule, nursing should be undertaken while a patient is receiving intrathecal baclofen only if the potential benefit justifies the potential risks to the infant.
Children should be of sufficient body mass to accommodate the implantable pump for chronic infusion. Please consult pump manufacturer's manual for specific recommendations. Safety and effectiveness in pediatric patients below the age of 4 have not been established. Cons iderations bas ed on experience with oral baclofen (baclofen USP) A dose-related increase in incidence of ovarian cysts was observed in female rats treated chronically with oral baclofen. Ovarian cysts have been found by palpation in about 4% of the multiple sclerosis patients who were treated with oral baclofen for up to one year. In most cases these cysts disappeared spontaneously while patients continued to receive the drug. Ovarian cysts are estimated to occur spontaneously in approximately 1% to 5% of the normal female population.
Special attention must be given to recognizing the signs and symptoms of overdosage, especially during the initial screening and dos e-titration phase of treatment, but also during re-introduction of Baclofen Injection (Intrathecal) after a period of interruption in therapy.
Symptoms Of Baclofen Injection (Intrathecal) Overdose
Drowsiness, lightheadedness, dizziness, somnolence, respiratory depression, hypothermia, seizures, rostral progression of hypotonia and loss of con-sciousness progressing to coma of up to 72 hr. duration. In most cases reported, coma was reversible without sequelae after drug was discontinued. Symptoms of intrathecal baclofen overdose were reported in a sensitive adult patient after receiving a 25 mcg intrathecal bolus.
Treatment Suggestions For Overdose
There is no specific antidote for treating overdoses of Baclofen Injection (Intrathecal); however, the following steps should ordinarily be undertaken:
- Residual Baclofen Injection (Intrathecal) solution should be removed from the pump as soon as possible.
- Patients with respiratory depression should be intubated if necessary, until the drug is eliminated.
The precise mechanism of action of baclofen as a muscle relaxant and antispasticity agent is not fully understood. Baclofen inhibits both monosynaptic and polysynaptic reflexes at the spinal level, possiblyby decreasing excitatory neurotransmitter release from primary afferent terminals, although actions at supraspinal sites may also occur and contribute to its clinical effect. Baclofen is a structural analog of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA), and may exert its effects by stimulation of the GABA receptor subtype.
Baclofen Injection (Intrathecal) when introduced directly into the intrathecal space permits effective CSF concentrations to be achieved with resultant plasma concentrations 100 times less than those occurring with oral administration.
In people, as well as in animals, baclofen has been shown to have general CNS depressant properties as indicated by the production of sedation with tolerance, somnolence, ataxia, and respiratory and cardiovascular depression.
Pharmacodynamics Of Baclofen Injection (Intrathecal)
Adult Patients : The onset of action is generally one-half hour to one hour after an intrathecal bolus. Peak spasmolytic effect is seen at approximately four hours after dosing and effects may last four to eight hours. Onset, peak response, and duration of action may vary with individual patients depending on the dose and severity of symptoms.
Pediatric Patients : The onset, peak response and duration of action is similar to those seen in adult patients.
Continuous Infusion: Intrathecal baclofen's antispastic action is first seen at 6 to 8 hours after initiation of continuous infusion. Maximum activity is observed in 24 to 48 hours. No additional information is available for pediatric patients.
Pharmacokinetics Of Baclofen Injection (Intrathecal)
The pharmacokinetics of CSF clearance of intrathecal baclofen calculated from intrathecal bolus orcontinuous infusion studies approximates CSF turnover, suggesting elimination is by bulk-flow removal of CSF.
Intrathecal Bolus : After a bolus lumbar injection of 50 or 100 mcg intrathecal baclofen in seven patients, the average CSF elimination half-life was 1.51 hours over the first four hours and the average CSF clearance was approximately 30 mL/hour.
Continuous Infusion: The mean CSF clearance for intrathecal baclofen was approximately 30 mL/hour in a study involving ten patients on continuous intrathecal infusion. Concurrent plasma concentrations of baclofen during intrathecal administration are expected to be low (0 to 5 ng/mL). Limited pharmacokinetic data suggest that a lumbar-cisternal concentration gradient of about 4:1 is established along the neuroaxis during baclofen infusion. This is based upon simultaneous CSF sampling via cisternal and lumbar tap in 5 patients receiving continuous baclofen infusion at the lumbar level at doses associated with therapeutic efficacy; the interpatient variability was great. The gradient was not altered by position.
Six pediatric patients(age 8 to 18 years) receiving continuous intrathecal baclofen infusion at doses of 77 to 400 mcg/day had plasma baclofen levels near or below 10 ng/mL.
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