Pseudoephedrine (commonly abbreviated as PSE) is a sympathomimetic amine commonly used as a decongestant. The salts pseudoephedrine hydrochloride and pseudoephedrine sulfate are found in many over-the-counter preparations either as single-ingredient preparations, or more commonly in combination with antihistamines, paracetamol and/or ibuprofen. Consumers often refered to it by a product which contains pseudoephedrine, such as Sudafed, the trademark for a common brand of pseudoephedrine hydrochloride in North America, the United Kingdom and Australia.

poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it