Effexor - antidepressant. Active ingredient - venlafaxine and its main metabolite O-desmetilvenlafaxine which are strong inhibitors of the return serotonin reuptake and noradrenaline and weak inhibitors of the return capture of a dopamine. It is considered that the mechanism of antidepressive action is connected with ability of drug to strengthen transfer of nervous impulses in CNS.

Zerit - treatment of infection caused by HIV, with severe clinical manifestations and ineffectiveness or intolerance of zidovudine, and other antiretroviral drugs. The nucleoside analogue of thymidine is phosphorylated by cellular enzymes to its active form - stavudine triphosphate. Suppresses reverse transcriptase of HIV, cellular DNA polymerases (beta and gamma), inhibits the synthesis of viral and mitochondrial DNA. It is active against HIV-1.