PHENERGAN 25MG contains Promethazine, which belongs to the Antihistamine class of medications. It is used to induce sleep in adults with insomnia (difficulty falling asleep) and in children aged 5 and up. It's also used to treat allergic reactions like hay fever and skin rashes. It also aids in the prevention of nausea and vomiting caused by travel.Disclaimer:For More Information Contact Your Physician