Sudafed Pills

Sudafed® (pseudoephedrine hydrochloride) is a medicine used for relieving nasal congestion due to allergies or the common cold and for relieving sinus congestion and pressure. It comes in the form of tablets (Sudafed pills come in both immediate-release and extended-release form) and a liquid and is available over the counter.
Sudafed is part of a class of drugs called decongestants. Specifically, it works by stimulating certain receptors known as alpha-adrenergic receptors. In the lining of the nose and sinuses, this action causes the blood vessels to constrict, allowing less fluid to leave the blood vessels and decreasing inflammation. This helps to relieve nasal and sinus congestion.
Most people appear to tolerate and respond well to this medication. However, you should talk to your healthcare provider before taking any Sudafed products if you are pregnant or have high blood pressure, diabetes, an overactive thyroid, or glaucoma.
(Click Sudafed for information on when and how to take the liquid or pill versions of Sudafed, to find out what side effects may occur with this drug, and to learn more about the warnings and precautions associated with this decongestant.)
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