It is an antiallergic medicine.When your body is exposed to an allergen (pollen, animal dander, house dust etc.), it produces a chemical called histamine. This results in watery eyes, runny or blocked nose, sneezing, itching, skin rashes, etc. Promethazine functions by blocking histamine ‘s function, thus relieving certain symptoms. It also acts directly on multiple brain areas to avoid nausea and vomiting and help you relax. It is used for the treatment of nausea and vomiting. It is also used to treat insomnia (difficulty sleeping) in short term in adults and as a sedative in children aged 5 years and older.
