The salts pseudoephedrine hydrochloride and pseudoephedrine sulfate are found in many over-the-counter drugs either as single-ingredient preparations , or more commonly in combination with antihistamines , paracetamol ( acetaminophen ) and\/or ibuprofen . The salts pseudoephedrine hydrochloride and pseudoephedrine sulfate are found in many over-the-counter preparations either as a single ingredient or , more commonly , in combination with antihistamines , guaifenesin , dextromethorphan , paracetamol ( acetaminophen ) , and\/or NSAIDs ( e.g. , aspirin , ibuprofen , etc. ) .