Pseudoephedrine is one of the most common.
It will NOT make you drowsy because it does not contain an antihistamine. Do not take before bed, swich to actifed or check with a doctor or nurse. Antihistamines often cause drowsiness and are often found in OTC products designed to relieve cold and allergy symptoms. Examples of antihistamines include diphenhydramine hydrochloride chlorpheniramine, and clemastine fumarate. Side effects include dizziness, nervousness, sleeplessness, and heart palpitations.