<prompt> Mechanism of action of maraviroc:Cyt P 450 inhibitorGP 41 inhibitorCCR5 inhibitorGP 120 inhibitor  <response>: Ans. c CCR5 inhibitorRef: Mosby drug reference for health professionals 2015 ed 996 Maraviroc is an anti HIV drug which comes under fusion inhibitor category. This drug binds to the receptor and inhibits the fusion stage of virus and hence inhibits their speed of replication. There are two types of fusion inhibitors:Drugs which bind to CCR5 receptorDrugs which bind to GP 41 receptorMaraviroc: active against CCR5 tropic virus.Enfuvirtide: prevents entry of virus into host cell.Can be given orally.Can only be given in s.c. injection form. 