citalopram drug pathway citalopram pharmacodynamics pathway 2015-10-27T15:07:46Z PW:0002118 SMP:00424 The pathway of citalopram-target interaction and of the biochemical or physiological responses to drug. The drug is used in the treatment of major depressive disorders and its effect results from selective inhibition of serotonin reuptake. Genetic variations can cause differences in the response of the organism to the drug. pathway vpetri