Phenergan Injection 2 ml is an antihistamine, which is a type of medication used to treat allergic reactions, insomnia, and travel sickness. Allergy or hypersensitivity is a response of your immune system to foreign elements that are usually not harmful to your body. Insomnia is a sleep disorder that causes difficulty falling or remaining asleep. Travel sickness is an illness characterised by nausea and vomiting caused by motion during travel.Disclaimer:For More Information Contact Your Physician