Lung as reservoir for antidepressants in pharmacokinetic drug interactions

Lancet
Tetsuya SuharaY Sasaki

Abstract

Although high-affinity imipramine binding sites have been reported in both rat and human lung, the role of the lungs in the pharmacokinetics of antidepressants has not received much attention. Substantial accumulation of selective serotonin-reuptake inhibitors (SSRIs) in the lungs has been reported. We have investigated the role of the lungs in pharmacokinetic drug interactions between tricyclic antidepressants and SSRIs. We used a carbon-11-labelled form of the imipramine derivative cyanoimipramine to measure uptake in the lungs and brain of healthy volunteers by positron emission tomography. Clomipramine (50 mg) was administered to measure the effect of antidepressants with high affinity for the serotonin transporter on lung and brain uptake. A large proportion of the injected 11C-cyanoimipramine (68-86% in the four volunteers) was extracted by the lungs. Clomipramine decreased the lung uptake from 68% to 35% and from 81% to 54% in the two volunteers studied. By contrast, whole-brain uptake was low in control studies (1.7-2.0% in three volunteers) and increased after clomipramine administration (to 4.5-4.9%). Plasma radioactivity was also higher after clomipramine than in control studies. The lungs may function as a reservoir...Continue Reading

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