Lee says. That's where the class of medications known as nasal decongestants—which includes both phenylephrine and ...

Ones containing pseudoephedrine are being reviewed because they may cause vessels supplying the brain to contract or spasm, reducing blood flow. The concern is this could lead to seizures and even ...

Pseudoephedrine is generally considered the ... a process called “first-pass metabolism”, which significantly reduces the amount that reaches the bloodstream and nasal tissues.

"Pseudoephedrine is generally considered the ... a process called “first-pass metabolism”, which significantly reduces the amount that reaches the bloodstream and nasal tissues." ...

Pseudoephedrine is generally considered the more effective option ... When swallowed, phenylephrine is quickly broken down by the liver and gut, a process called “first-pass metabolism”, which ...