Antihistamines, chloral hydrate, glutethimide, methocarbamol Depressant effects of morphine may be enhanced.
Cimetidine Monitor for increased respiratory and CNS depression. Concomitant administration of cimetidine and morphine has been reported to precipitate apnea, confusion, and muscle twitching in an isolated report.
Clomipramine, nortriptyline, amitriptyline Monitor for increased CNS and respiratory depression when administered with morphine.
CNS depressants (eg, alcohol, sedatives, tranquilizers) Additive CNS depression.
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