Phenergan Elixir 120ml – Relieve Allergies & Promote RelaxationPhenergan Elixir 120ml Relieve Allergies and Promote Relaxation Phenergan Elixir 120ml, manufactured by Sanofi Aventis Pakistan Ltd., contains the active ingredient promethazine hydrochloride, a potent histamine blocker. It belongs to the phenothiazine group of medications, commonly used to treat allergic reactions and to help promote relaxation. This elixir works by blocking the natural substance (histamine) that the body produces during allergic