The active ingredient pseudoephedrine hydrochloride (HCL) with a dosage strength of 30 milligrams is used as a nasal decongestant, notes the United States National Institutes of Health's DailyMed. This medication functions by constricting the blood vessels to reduce inflammation and respiratory blockage.
Pseudoephedrine HCL is a nonprescription drug sold under the brand names Afrin, Sudafed, Drixoral and Dimetapp. This active ingredient provides short-term symptomatic relief for the flu, common cold and some respiratory diseases.
Pseudoephedrine temporarily alleviates nasal obstruction and sinus discomfort due to an infection or respiratory illness, including hay fever, bronchitis and allergic reactions, states WebMD. A physician may also recommend using this medication to minimize pain and swelling in the ear when experiencing sudden changes in air pressure.