S Krähenbühl1, V Smith-Gamble, C L Hoppel
1Department of Pharmacology, Case Western Reserve University School of Medicine, Cleveland, USA.
Concomitant administration of diltiazem significantly increases plasma concentrations of nortriptyline. This pharmacokinetic interaction likely stems from diltiazem reducing the first-pass clearance of nortriptyline, enhancing its bioavailability.
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