flexeril and Atapryl Interactions

Interactions between flexeril(cyclobenzaprine) and Atapryl (selegiline)

cyclobenzaprine and selegiline (Major Drug-Drug)

CONTRAINDICATED: Coadministration of monoamine oxidase inhibitors (MAOIs) and dibenzazepine derivatives (e.g., tricyclic and tetracyclic antidepressants, cyclobenzaprine, carbamazepine) may rarely produce significant adverse reactions including nausea, vomiting, flushing, dizziness, tremor, myoclonus, rigidity, diaphoresis, hyperthermia, autonomic instability, hypertensive crises, disseminated intravascular coagulation, severe convulsive seizures, coma, and death. The exact mechanism is unknown but may be related to excessive serotonergic activity in the CNS (i.e. serotonin syndrome). Clinically, the interaction has been reported primarily in patients treated with MAOIs (including reversible, irreversible, selective, and nonselective) and tricyclic antidepressants, especially imipramine and clomipramine, which are the most potent serotonin reuptake inhibitors of their class. However, other dibenzazepine-type drugs may theoretically produce this interaction also, based on their structural and pharmacologic similarities to the tricyclic antidepressants.

MANAGEMENT: In general, dibenzazepine derivatives should not be used concurrently with MAOIs or other agents that possess MAOI activity (e.g., furazolidone, procarbazine). At least 14 days should elapse between discontinuation of MAOI therapy and initiation of treatment with tricyclic antidepressants, and vice versa. Although it remains controversial, some experts have suggested that certain MAOIs and tricyclic antidepressants (except imipramine and clomipramine) may be used together for the treatment of refractory depression under special circumstances and close supervision, with the following empirical guidelines: the current tricyclic or MAOI should be discontinued for 10 to 14 days; both drugs should then be started at low dosages; the drugs should not be administered parenterally; dose changes should be made in small increments; serotonin reuptake inhibitors must not be used concurrently; and patients should be closely monitored for signs of adverse serotonergic effects.