Pipofezine(Azafen or Azaphen) is a potent inhibitor of the reuptake of serotonin. IC50 Value: Target: SSRIs Pipofezine is a tricyclic antidepressant (TCA) approved in Russia for the treatment of depression. In addition to its antidepressant action, pipofezine has sedative effects as well, indicating antihistamine activity.