Phenergan Promethazine Oral Solution (100ml). Phenergan Oral Solution contains a medicine called promethazine hydrochloride. This belongs to a group of medicines called phenothiazines.. It works by blocking a natural substance (histamine) that your body makes during an allergic reaction. It also works directly on the brain to help you feel more relaxed.. Phenergan 5mg/5ml oral solution also contains Sodium Metabisulphite (E223), this may rarely cause severe hypersensitivity reactions and broncospasm.. What Phenergan Oral Solution is used for. To treat allergic conditions such as hay fever or rashes (like nettle rash or hives).. To prevent nausea or vomiting (e.g. travel sickness).
