Pseudoephedrine and Phenylephrine (Sudafed)

Pseudoephedrine is a stimulant medication used to treat the symptoms of the common cold, sinusitis and nasal congestion. While pseudoephedrine appears in small doses in many popular, over-the-counter decongestants, the product is heavily regulated. Pseudoephedrine's chemical structure is very similar to that of amphetamine, making it a key component in some illegal drugs. Due to the tight regulations, Phenylephrine is often sold as an over the counter substitute.

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