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Commonly Encountered Reactions: During controlled clinical trials of Cesamet (nabilone capsules) , virtually all patients experienced at least one adverse reaction. The most commonly encountered events were drowsiness, vertigo, dry mouth, euphoria (feeling “high”), ataxia, headache, and concentration difficulties.
Comparative Incidence of Reactions: Accurate estimates of the incidence of adverse events associated with the use of any drug are difficult to obtain. Estimates are influenced by factors such as drug dose, detection technique, setting, and physician judgments, among others. Consequently, the tables presented below are presented solely to indicate the relative frequency of adverse events reported in representative controlled clinical studies conducted to evaluate the safety and efficacy of Cesamet (nabilone capsules) under relatively similar conditions of use. The figures cited cannot be used to predict precisely the incidence of untoward events in the course of usual medical practice, in which patient characteristics and other factors may differ from those that prevailed in the clinical trials. These incidence figures also cannot be compared with those obtained from other clinical studies involving related drug products because each group of drug trials is conducted under a different set of conditions.
Finally, it is important to emphasize that these tabulations do not reflect the relative severity and/or clinical importance of the adverse events. A better perspective on the serious adverse events associated with the use of Cesamet is provided in the WARNINGS and PRECAUTIONS sections.
The following tables list in order of decreasing frequency the adverse reactions encountered by a substantial proportion of patients treated with Cesamet (nabilone capsules) participating in representative controlled clinical trials.
Incidence of Adverse Reactions in Placebo-Controlled Studies
Incidence of Adverse Reactions in Active-Controlled Studies
|Adverse Event|| Nabilone
Adverse Reactions by Body System - The following list of adverse events is organized by decreasing frequency within body systems for patients treated with Cesamet (nabilone capsules) in controlled clinical trials. All events are listed regardless of causality assessment.
Blood and Hematopoietic - Anemia
Eye and Ear - Vision disturbance, ear tightness, eye irritation, eye dryness, equilibrium dysfunction, tinnitus, eye disorder, amblyopia, eye swelling, eyelid diseases, pupil dilation, photophobia, and visual field defect.
Genitourinary - Increased urination, decreased urination, hot flashes, urinary retention, and frequency of micturition.
Infection - Bacterial infection
Metabolic and Endocrine - Thirst
Nervous System - Drowsiness, vertigo, ataxia, decreased concentration, sedation, hallucinations, paresthesia, tremor, memory disturbance, perception disturbance, convulsions, dystonia, numbness, and akathisia.
Psychiatric - Euphoria (feeling “high”), sleep disturbance, depression, confusion, disorientation, anxiety, depersonalization syndrome, speech disorder, abnormal dreams, insomnia, mood swings, inebriated feeling, toxic psychosis, paranoia, apathy, thought disorder, withdrawal, panic disorder, phobic neurosis, emotional disorder, and hyperactivity.
Miscellaneous and Ill-Defined Conditions - Headache, fatigue, lightheadedness, coordination disturbance, asthesia, dysphoria, dizziness, taste change, excessive appetite, chills, excessive sweating, nervousness, malaise, postural dizziness, twitch, irritability, fever, inhibited walking, unconsciousness, hypotonia, and impaired urination.
Postmarketing Adverse Reactions - Cesamet (nabilone capsules) has been marketed internationally since 1982. The following adverse reactions listed in order of decreasing frequency by body system have been reported since Cesamet (nabilone capsules) has been marketed. All events are listed regardless of causality assessment.
Blood and Hematopoietic - Leukopenia
Cardiovascular - Hypotension and tachycardia
Eye and Ear - Visual disturbances
Gastrointestinal - Dry mouth, nausea, vomiting, and constipation
Nervous System - Hallucinations, CNS depression, CNS stimulation, ataxia, stupor, vertigo, convulsion, and circumoral paresthesia
Psychiatric - Somnolence, confusion, euphoria, depression, dysphoria, depersonalization, anxiety, psychosis, and emotional lability
Miscellaneous and Ill-Defined Conditions - Dizziness, headache, insomnia, abnormal thinking, chest pain, lack of effect, and face edema
Drug Abuse And Dependence
Controlled Substance - Cesamet (nabilone capsules) , a synthetic cannabinoid pharmacologically related to Cannabis sativa L. (Marijuana; (delta-9-THC) is a highly abusable substance. Cesamet (nabilone capsules) is controlled under Schedule II (CII) of the Controlled Substances Act. Prescriptions for Cesamet (nabilone capsules) should be limited to the amount necessary for a single cycle of chemotherapy (i.e., a few days). Cesamet (nabilone capsules) may produce subjective side effects which may be interpreted as a euphoria or marijuana-like "high" at therapeutic doses.
It is not known what proportion of individuals exposed chronically to Cesamet (nabilone capsules) or other cannabinoids will develop either psychological or physical dependence. Long term use of these compounds has, however, been associated with disorders of motivation, judgment, and cognition. It is not clear, though, if this is a manifestation of the underlying personalities of chronic users of this class of drugs or if cannabinoids are directly responsible for these effects. An abstinence syndrome has been reported following discontinuation of delta-9-THC at high doses of 200 mg per day for 12 to 16 consecutive days. The acute phase was characterized by psychic distress, insomnia, and signs of autonomic hyperactivity (sweating, rhinorrhea, loose stools, hiccups). A protracted abstinence phase may have occurred in subjects who reported sleep disturbances for several weeks after delta-9-THC discontinuation.
Abuse - Cesamet (nabilone capsules) may produce subjective side effects that may be interpreted as a euphoria or marijuana-like "high" at therapeutic doses. Cesamet (nabilone capsules) was shown to be qualitatively and quantitatively similar to approved oral delta-9-THC in the production of cannabis-like effects, thus demonstrating its potential for abuse.
Preclinical studies performed in both dogs and monkeys demonstrated that Cesamet (nabilone capsules) was cannabinoid-like. As with delta-9-THC, tolerance develops rapidly to the pharmacological effects in both the dog and the monkey. Cross-tolerance between Cesamet (nabilone capsules) and delta-9-THC was demonstrated in the monkey.
Dependence - The physical dependence capacity of Cesamet (nabilone capsules) is unknown at this time. Patients who participated in clinical trials of up to 5 days' duration evidenced no withdrawal symptoms on cessation of dosing.
Read the Cesamet (nabilone capsules) Side Effects Center for a complete guide to possible side effects »
Potential interactions between Cesamet (nabilone capsules) 2 mg, and diazepam 5 mg; sodium secobarbital 100 mg; alcohol 45 mL (absolute laboratory alcohol); or codeine 65 mg, were evaluated in 15 subjects. Only a single combination was utilized at any one time. The subjects were evaluated according to physiologic (i.e., heart rate and blood pressure), psychometric, psychomotor, and subjective parameters. In this study, as expected, the depressant effects of the combinations were additive. Psychomotor function was particularly impaired with concurrent use of diazepam. Caution must thus be used when administering nabilone in combination with any CNS depressant.
Nabilone is purportedly highly bound to plasma proteins, and therefore, might displace other protein-bound drugs. Therefore, practitioners should monitor patients for a change in dosage requirements when administering nabilone to patients receiving other highly protein-bound drugs. Published reports of drug/drug interactions involving cannabinoids are summarized in the following table.
|CONCOMITANT DRUG||CLINICAL EFFECT(S)|
|Amphetamines, cocaine, other sympathomimetic agents||Additive hypertension, tachycardia, possibly cardiotoxicity|
|Atropine, scopolamine, antihistamines, other anticholinergic agents||Additive or super-additive tachycardia, drowsiness|
|Amitriptyline, amoxapine, desipramine, other tricyclic antidepressants||Additive tachycardia, hypertension, drowsiness|
|Barbiturates, benzodiazepines, ethanol, lithium, opioids, buspirone, antihistamines, muscle relaxants, other CNS depressants||Additive drowsiness and CNS depression|
|Disulfiram||A reversible hypomanic reaction was reported in a 28 y/o man who smoked marijuana; confirmed by dechallenge and rechallenge|
|Fluoxetine||A 21 y/o female with depression and bulimia receiving 20 mg/day fluoxetine X 4 wks became hypomanic after smoking marijuana; symptoms resolved after 4 days|
|Antipyrine, barbiturates||Decreased clearance of these agents, presumably via competitive inhibition of metabolism|
|Theophylline||Increased theophylline metabolism reported with smoking of marijuana; effect similar to that following smoking tobacco|
|Opioids||Cross-tolerance and mutual potentiation|
|Naltrexone||Oral THC effects were enhanced by opioid receptor blockade.|
|Alcohol||Increase in the positive subjective mood effects of smoked marijuana|
Last reviewed on RxList: 2/26/2009
This monograph has been modified to include the generic and brand name in many instances.
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