Original: 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. ) .
Simplified: The advantage of oral pseudoephedrine over topical nasal preparations , such as oxymetazoline , is that it does not cause rebound congestion ( rhinitis medicamentosa ) ; however , it is more likely to cause adverse effects including high blood pressure .