"The US Food and Drug Administration (FDA) has approved carbidopa/levodopa enteral suspension (Duopa, AbbVie) for the treatment of motor fluctuations in patients with advanced Parkinson's disease, according to a company news release.
Serious Adverse Reactions After Intravenous Administration
Following intravenous administration of APOKYN, serious adverse reactions including thrombus formation and pulmonary embolism due to intravenous crystallization of apomorphine have occurred. Consequently, APOKYN should not be administered intravenously.
Nausea and Vomiting
APOKYN causes severe nausea and vomiting when it is administered at recommended doses. Because of this, in domestic clinical studies, 98% of all patients were pre-medicated with trimethobenzamide, an antiemetic, for three days prior to study enrollment, and were then encouraged to continue trimethobenzamide for at least 6 weeks. Even with the use of concomitant trimethobenzamide in clinical studies, 31% and 11% of the APOKYN-treated patients had nausea and vomiting, respectively, and 3% and 2% of the patients discontinued APOKYN due to nausea and vomiting, respectively. Among 522 patients treated, 262 (50%) discontinued trimethobenzamide while continuing APOKYN. The average time to discontinuation of trimethobenzamide was about 2 months (range: 1 day to 33 months). For the 262 patients who discontinued trimethobenzamide, 249 patients continued apomorphine without trimethobenzamide for a duration of follow-up that averaged 1 year (range: 0 years to 3 years).
The ability of concomitantly administered antiemetic drugs (other than trimethobenzamide) to reduce the incidence of nausea and/or vomiting in APOKYN-treated patients has not been studied. Antiemetics with anti-dopaminergic actions (e.g., haloperidol, chlorpromazine, promethazine, prochlorperazine, metaclopramide) have the potential to worsen the symptoms in patients with Parkinson's disease and should be avoided.
Falling Asleep During Activities Of Daily Living And Somnolence
There have been reports in the literature of patients treated with APOKYN subcutaneous injections who suddenly fell asleep without prior warning of sleepiness while engaged in activities of daily living. Somnolence is commonly associated with APOKYN, and it is reported that falling asleep while engaged in activities of daily living always occurs in a setting of pre-existing somnolence, even if patients do not give such a history. Somnolence was reported in 35% of patients treated with APOKYN and in none of the patients in the placebo group. Prescribers should reassess patients for drowsiness or sleepiness, especially since some of the events occur well after the start of treatment. Prescribers should also be aware that patients may not acknowledge drowsiness or sleepiness until directly questioned about drowsiness or sleepiness during specific activities.
Before initiating treatment with APOKYN, advise patients of the risk of drowsiness and ask them about factors that could increase the risk with APOKYN, such as concomitant sedating medications and the presence of sleep disorders. If a patient develops significant daytime sleepiness or falls asleep during activities that require active participation (e.g., conversations, eating, etc.), APOKYN should ordinarily be discontinued. If a decision is made to continue APOKYN, patients should be advised not to drive and to avoid other potentially dangerous activities. There is insufficient information to determine whether dose reduction will eliminate episodes of falling asleep while engaged in activities of daily living.
In clinical studies, approximately 2% of APOKYN-treated patients experienced syncope.
Hypotension / Orthostatic Hypotension
Dopamine agonists, including APOKYN, may cause orthostatic hypotension at any time but especially during dose escalation. Patients with Parkinson's disease may also have an impaired capacity to respond to an orthostatic challenge. For these reasons, Parkinson's disease patients being treated with dopaminergic agonists ordinarily require careful monitoring for signs and symptoms of orthostatic hypotension, especially during dose escalation, and should be informed of this risk.
Patients undergoing titration of APOKYN showed an increased incidence (from 4% pre-dose to 18% post-dose) of systolic orthostatic hypotension ( ≥ 20 mmHg decrease) when evaluated at various times after in-office dosing. A small number of patients developed severe systolic orthostatic hypotension ( ≥ 30 mmHg decrease and systolic BP ≤ 90 mmHg) after subcutaneous apomorphine injection. In clinical trials of APOKYN in patients with advanced Parkinson's disease, 59 of 550 patients (11%) had orthostatic hypotension, hypotension, and/or syncope. These events were considered serious in 4 patients ( < 1%) and resulted in withdrawal of APOKYN in 10 patients (2%). These events occurred both with initial dosing and during long-term treatment. Whether or not hypotension contributed to other significant adverse events seen (e.g., falls), is unknown. APOKYN causes dose-related decreases in systolic (SBP) and diastolic blood pressure (DBP) [see CLINICAL PHARMACOLOGY].
The hypotensive effects of APOKYN may be increased by the concomitant use of alcohol, antihypertensive medications, and vasodilators (especially nitrates). Patients should avoid alcohol when using APOKYN. Check blood pressure for hypotension and orthostatic hypotension in patients APOKYN with concomitant antihypertensive medications and/or vasodilators [see DRUG INTERACTIONS].
Patients with Parkinson's disease (PD) are at risk of falling due to underlying postural instability, possible autonomic instability, and syncope caused by the blood pressure lowering effects of the drugs used to treat PD. Subcutaneous APOKYN might increase the risk of falling by simultaneously lowering blood pressure and altering mobility [see CLINICAL PHARMACOLOGY].
In clinical trials, 30% of patients had events that could reasonably be considered falls and about 5% of patients had falls that were considered serious.
Hallucinations / Psychotic-Like Behavior
In clinical studies, hallucinations were reported by 14% of the APOKYN-treated patients. In one randomized, double-blind, placebo-controlled study, hallucinations or confusion occurred in 10% of patients treated with APOKYN and 0% of patients treated with placebo. Hallucinations resulted in discontinuation of APOKYN in 1% of patients.
Post marketing reports indicate that patients may experience new or worsening mental status and behavioral changes, which may be severe, including psychotic-like behavior after starting or increasing the dose of APOKYN. Other drugs prescribed to improve the symptoms of Parkinson's disease can have similar effects on thinking and behavior. This abnormal thinking and behavior can consist of one or more of a variety of manifestations, including paranoid ideation, delusions, hallucinations, confusion, disorientation, aggressive behavior, agitation, and delirium.
Patients with a major psychotic disorder should ordinarily not be treated with APOKYN because of the risk of exacerbating psychosis. In addition, certain medications used to treat psychosis may exacerbate the symptoms of Parkinson's disease and may decrease the effectiveness of APOKYN [see DRUG INTERACTIONS].
APOKYN may cause dyskinesia or exacerbate pre-existing dyskinesia. In clinical studies, dyskinesia or worsening of dyskinesia was reported in 24% of patients. Overall, 2% of APOKYN-treated patients withdrew from studies due to dyskinesias.
Impulse Control/Compulsive Behaviors
Case reports suggest that patients can experience intense urges to gamble, increased sexual urges, intense urges to spend money uncontrollably, and other intense urges and the inability to control these urges while taking one or more of the medications, including APOKYN, that increase central dopaminergic tone and that are generally used for the treatment of Parkinson's disease. In some cases, although not all, these urges were reported to have stopped when the dose was reduced or the medication was discontinued. Because patients may not recognize these behaviors as abnormal it is important for prescribers to specifically ask patients or their caregivers about the development of new or increased gambling urges, sexual urges, uncontrolled spending or other urges while being treated with APOKYN. Physicians should consider dose reduction or stopping the medication if a patient develops such urges while taking APOKYN.
In clinical studies, 4% of patients treated with APOKYN experienced angina, myocardial infarction, cardiac arrest and/or sudden death; some cases of angina and myocardial infarction occurred in close proximity to APOKYN dosing (within 2 hours), while other cases of cardiac arrest and sudden death were observed at times unrelated to dosing. APOKYN has been shown to reduce resting systolic and diastolic blood pressure and may have the potential to exacerbate coronary (and cerebral) ischemia in patients with known cardiovascular and cerebrovascular disease. If patients develop signs and symptoms of coronary or cerebral ischemia, prescribers should re-evaluate the continued use of APOKYN.
QTc Prolongation And Potential For Proarrhythymic Effects
There is a small dose related prolongation of QTc interval with doses of APOKYN greater than 6 mg [See CLINICAL PHARMACOLOGY]. Doses greater than 6 mg do not provide additional clinical benefit and are not recommended.
Drugs that prolong the QTc interval have been associated with torsades de pointes and sudden death. The relationship of QTc prolongation to torsades de pointes is clearest for larger increases (20 msec and greater), but it is possible that smaller QTc prolongations may also increase risk, or increase it in susceptible individuals, such as those with hypokalemia, hypomagnesemia, bradycardia, concomitant use of other drugs that prolong the QTc interval, or genetic predisposition (e.g., congenital prolongation of the QT interval). Although torsades de pointes has not been observed in association with the use of APOKYN at recommended doses in clinical studies, experience is too limited to rule out an increased risk. Palpitations and syncope may signal the occurrence of an episode of torsades de pointes.
The risks and benefits of APOKYN treatment should be considered prior to initiating treatment with APOKYN in patients with risk factors for prolonged QTc.
Withdrawal-Emergent Hyperpyrexia And Confusion
A symptom complex resembling the neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in antiparkinsonian therapy.
Epidemiological studies have shown that patients with Parkinson's disease have a higher risk (2-to approximately 6-fold higher) of developing melanoma than the general population. Whether the increased risk observed was due to Parkinson's disease or other factors, such as drugs used to treat Parkinson's disease, is unclear.
For the reasons stated above, patients and providers are advised to monitor for melanomas frequently and on a regular basis when using APOKYN for any indication. Ideally, periodic skin examinations should be performed by appropriately qualified individuals (e.g., dermatologists).
Cases of retroperitoneal fibrosis, pulmonary infiltrates, pleural effusion, pleural thickening, and cardiac valvulopathy have been reported in some patients treated with ergot-derived dopaminergic agents. While these complications may resolve when the drug is discontinued, complete resolution does not always occur. Although these adverse reactions are believed to be related to the ergoline structure of these dopamine agonists, whether other, nonergot derived dopamine agonists, such as APOKYN, can cause these reactions is unknown.
APOKYN may cause prolonged painful erections in some patients. In clinical studies, painful erections were reported by 3 of 361 APOKYN-treated men, and one patient withdrew from APOKYN therapy because of priapism. Although no patients in the clinical studies required surgical intervention, severe priapism may require surgical intervention.
Retinal Pathology In Albino Rats
In a 2-year carcinogenicity study of apomorphine in albino rat, retinal atrophy was detected at all subcutaneous doses tested (up to 0.8 mg/kg/day or 2 mg/kg/day in males or females, respectively; less than the maximum recommended human dose of 20 mg/day on a body surface area (mg/m²) basis). Retinal atrophy/degeneration has been observed in albino rats treated with other dopamine agonists for prolonged periods (generally during 2-year carcinogenicity studies). Retinal findings were not observed in a 39-week subcutaneous toxicity study of apomorphine in monkey at doses up to 1.5 mg/kg/day, a dose similar to the MRHD on a mg/m² basis. The clinical significance of the finding in rat has not been established but cannot be disregarded because disruption of a mechanism that is universally present in vertebrates (e.g., disk shedding) may be involved.
Patient Counseling Information
See FDA-approved patient labeling (PATIENT INFORMATION and Instructions for Use)
Administration With The APOKYN Pen
Instruct patients and caregivers to read the “Patient Information and Instructions for Use for APOKYN and the dosing pen. Instruct patients to use APOKYN only as prescribed [See DOSAGE AND ADMINISTRATION].
Instruct patients and caregivers that the APOKYN Pen is dosed in milliliters, not milligrams.
Inform patients and caregivers that it is possible to dial in their usual dose of APOKYN even though the cartridge may contain less than that amount of drug. In this case, they will receive only a partial dose with the injection, and the amount left to inject will appear in the dosing window. To complete the correct dose, patients/caregivers will need to “re-arm” the device and dial in the correct amount of the remaining dose. Patients and caregivers should be alerted to the fact that there may be insufficient drug left in the cartridge to deliver a complete dose (for example, patients and caregivers should be urged to keep records of how many doses they have delivered for each cartridge, so that they can replace any cartridge that has an inadequate amount of drug remaining).
Instruct patients to rotate the injection site and to observe proper aseptic technique.
Advise patients that APOKYN is intended only for subcutaneous injection and must not be given intravenously because of the risk of serious complications such as thrombus formation and pulmonary embolism due to crystallization [see WARNINGS AND PRECAUTIONS].
Avoidance Of Concomitant Antiemetic Drugs Of 5HT3 Antagonist Class
Advise patients that they should not use concomitant drugs of the 5HT3 antagonist class including antiemetics (e.g., ondansetron, granisetron, dolasetron, palonosetron) and alosetron with APOKYN. Use of APOKYN with concomitant antiemetic drugs of the 5HT3 antagonist class is contraindicated because there have been reports of profound hypotension and loss of consciousness when APOKYN was administered with ondansetron [see CONTRAINDICATIONS].
Hypersensitivity / Allergic Reactions
Advise patients that hypersensitivity/allergic reaction characterized by urticaria, rash, pruritus, and/or various manifestations of angioedema may occur because of APOKYN or any of its excipients including a sulfite (i.e., sodium metabisulfite). Inform patients with a sulfite sensitivity that they may experience various allergic-type reactions, including anaphylactic symptoms and life-threatening asthmatic attacks. Advise patients who experience any hypersensitivity/allergic reaction to APOKYN that they should avoid taking APOKYN again [see CONTRAINDICATIONS].
Nausea And Vomiting
Advise patients that they may experience severe nausea and/or vomiting and that they should begin taking trimethobenzamide 300 mg tablets orally 3 times per day for three days prior to starting APOKYN injections and continue taking it until told by a healthcare provider that trimethobenzamide can be discontinued [see WARNINGS AND PRECAUTIONS].
Falling Asleep Suddenly And Sedation / Sleepiness
Alert patients to the potential sedating effects of APOKYN, including somnolence and falling asleep while engaged in activities of daily living. Instruct patients not to drive a car or engage in other potentially dangerous activities until they have gained sufficient experience with APOKYN to gauge whether or not it affects their mental and/or motor performance adversely. Advise patients that if increased somnolence or episodes of falling asleep during activities of daily living (e.g., watching television, passenger in a car, etc.) occur, they should not drive or participate in potentially dangerous activities until they have contacted their physician. Because of possible additive effects of alcohol use, advise patients to limit their alcohol intake [see WARNINGS AND PRECAUTIONS].
Advise patients that APOKYN may cause syncope [see WARNINGS AND PRECAUTIONS].
Hypotension / Orthostatic Hypotension
Advise patients that they may develop postural (orthostatic) hypotension with or without symptoms such as dizziness, nausea, syncope, and sometimes sweating. Hypotension and/or orthostatic symptoms may occur more frequently during initial therapy or with an increase in dose at any time (cases have been seen after months of treatment). Instruct patients to rise slowly after sitting or lying down after taking APOKYN. Instruct patients to limit their alcohol intake because it may potentiate the hypotensive effect of APOKYN [see WARNINGS AND PRECAUTIONS].
Alert patients that they may have increased risk for falling when using APOKYN [see WARNINGS AND PRECAUTIONS].
Hallucinations And/Or Psychotic-Like Behavior
Inform patients that hallucinations or other manifestations of psychotic-like behavior can occur. Tell patients if they have a major psychotic disorder, ordinarily they should not use APOKYN because of the risk of exacerbating the psychosis. Patients with a major psychotic disorder should also be aware that many treatments for psychosis may decrease the effectiveness of APOKYN [see WARNINGS AND PRECAUTIONS].
Inform patients that APOKYN may cause and/or exacerbate pre-existing dyskinesias [see WARNINGS AND PRECAUTIONS].
Impulse Control / Compulsive Behaviors
Patients and their caregivers should be alerted to the possibility that they may experience intense urges to spend money uncontrollably, intense urges to gamble, increased sexual urges, binge eating and/or other intense urges and the inability to control these urges while taking APOKYN [see WARNINGS AND PRECAUTIONS].
Inform patients that APOKYN may cause coronary events including angina and myocardial infarction and these outcomes could possibly be related to significant hypotension/orthostatic hypotension [see WARNINGS AND PRECAUTIONS].
QTc Prolongation and Potential for Proarrhythymic Effects
Alert patients that APOKYN may cause QTc prolongation and might produce proarrhythmic effects that could cause torsades de pointes and sudden death. Palpitations and syncope may signal the occurrence of an episode of torsades de pointes [see WARNINGS AND PRECAUTIONS].
Withdrawal-Emergent Hyperpyrexia And Confusion
Advise patients to contact their healthcare provider if they wish to discontinue APOKYN or decrease the dose of APOKYN [see WARNINGS AND PRECAUTIONS].
Advise patients with Parkinson's disease that they have a higher risk of developing melanoma. Advise patients to have a qualified healthcare provider examine that patient's skin periodically for melanomas on a regular basis when using APOKYN [see WARNINGS AND PRECAUTIONS].
Advise patients that APOKYN may cause prolonged painful erections and that if this occurs that they should seek medical attention immediately [see WARNINGS AND PRECAUTIONS].
Injection Site Reactions
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Lifetime carcinogenicity studies of apomorphine were conducted in male (0.1 mg/kg/day, 0.3 mg/kg/day, 0.8 mg/kg/day) and female (0.3 mg/kg/day, 0.8 mg/kg/day, 2 mg/kg/day) rats. Apomorphine was administered by subcutaneous injection for 22 months or 23 months, respectively. In males, there was an increase in Leydig cell tumors at the highest dose tested, which is less than the MRHD (20 mg) on a mg/m² basis. This finding is of questionable significance because the endocrine mechanisms believed to be involved in the production of Leydig cell tumors in rats are not relevant to humans. No drug-related tumors were observed in females; the highest dose tested is similar to the MRHD on a mg/m² basis. In a 26-week carcinogenicity study in P53-knockout transgenic mice, there was no evidence of carcinogenic potential when apomorphine was administered by subcutaneous injection at doses up to 20 mg/kg/day (male) or 40 mg/kg/day (female).
Apomorphine was mutagenic in the in vitro bacterial reverse mutation (Ames) and the in vitro mouse lymphoma tk assays. Apomorphine was clastogenic in the in vitro chromosomal aberration assay in human lymphocytes and in the in vitro mouse lymphoma tk assay. Apomorphine was negative in the in vivo micronucleus assay in mice.
Impairment of Fertility
Apomorphine was administered subcutaneously at doses up to 3 mg/kg/day (approximately 1.5 times the MRHD on a mg/m² basis) to male and female rats prior to and throughout the mating period and continuing in females through gestation day 6. There was no evidence of adverse effects on fertility or on early fetal viability. A significant decrease in testis weight was observed in a 39-week study in cynomolgus monkey at all subcutaneous dose tested (0.3 mg/kg/day, 1 mg/kg/day, 1.5 mg/kg/day); the lowest dose tested is less than the MRHD on a mg/m² basis.
In a published fertility study, apomorphine was administered to male rats at subcutaneous doses of 0.2 mg/kg, 0.8 mg/kg, and 2 mg/kg prior to and throughout the mating period. Fertility was reduced at the highest dose tested.
Use In Specific Populations
Pregnancy Category C
There are no adequate and well-controlled studies in pregnant women. APOKYN has been shown to be teratogenic in rabbits and embryolethal in rats when given at clinically relevant doses. APOKYN should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
No adverse developmental effects were observed when apomorphine (0.3 mg/kg/day, 1 mg/kg/day, 3 mg/kg/day) was administered by subcutaneous injection to pregnant rat throughout organogenesis; the highest dose tested (3 mg/kg/day) is 1.5 times the MRHD (20 mg/day) on a mg/m² basis. Administration of apomorphine (0.3 mg/kg/day, 1 mg/kg/day, 3 mg/kg/day) by subcutaneous injection to pregnant rabbits throughout organogenesis resulted in an increased incidence of malformations of the heart and/or great vessels at the mid and high doses tested; the no-effect dose is less than the MRHD on a mg/m² basis.
Apomorphine (0.3 mg/kg/day, 1 mg/kg/day, 3 mg/kg/day), administered by subcutaneous injection to females throughout gestation and lactation, resulted in increased offspring mortality at the highest dose tested. There were no effects on developmental parameters or reproductive performance in surviving offspring. The no-effect dose for developmental toxicity (1 mg/kg/day) is less than the MRHD on a mg/m² basis.
It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from APOKYN, a decision should be made as to whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Safety and effectiveness in pediatric patients have not been established.
In the APOKYN clinical development program, there were 239 patients less than age 65 treated with APOKYN and 311 patients who were age 65 years of age or older. Confusion and hallucinations were reported more frequently with patients age 65 and older compared to patients with less than age 65. Serious adverse reactions (life-threatening events or events resulting in hospitalization and/or increased disability) were also more common in patients age 65 and older. Patients age 65 and older were more likely to fall (experiencing bone and joint injuries), have cardiovascular events, develop respiratory disorders, and have gastrointestinal events. Patients age 65 and above were also more likely to discontinue APOKYN treatment as a result of one or more adverse reactions.
The starting APOKYN dose should be reduced in patients with mild or moderate renal impairment because the concentration and exposure (Cmax and AUC) are increased in these patients. Studies in subjects with severe renal impairment have not been conducted [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY].
Caution should be exercised when administrating APOKYN to patients with mild and moderate hepatic impairment due to the increased Cmax and AUC in these patients. Studies of subjects with severe hepatic impairment have not been conducted [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY].This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 8/8/2014
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