Mutual antagonism w/ l-dopa or dopaminergic agonists. Potentiated sedative effect w/ alcohol, CNS depressants eg, morphine derivatives, anxiolytics, sedative H
1-antihistamines & antidepressants, barbiturates, clonidine. Antagonized GI motility w/ anticholinergics, morphine derivatives. Additive effect on extrapyramidal disorders occurrence w/ neuroleptics. Increased risk of serotonin syndrome w/ serotonergic drugs eg, SSRIs. Decreased digoxin bioavailability. Increased cyclosporine bioavailability. Prolonged neuromuscular block duration w/ mivacurium, suxamethonium. Increased exposure levels by CYP2D6 inhibitors eg, fluoxetine, paroxetine. Enhanced effects of paracetamol, aspirin. Reduced plasma conc of atovaquone. Concomitant use w/ MAOIs, sympathomimetics.