: This is the original, potent decongestant. While you don't need a prescription in most U.S. states, it is kept behind the pharmacy counter to prevent misuse. Sudafed PE (Phenylephrine)

To buy pseudoephedrine-based Sudafed in the U.S., you must follow federal and state guidelines according to the FDA :

: There are strict limits on how much you can buy. Daily limit : 3.6 grams.

: You must present a valid government-issued photo ID. Age Limits : You typically must be 18 years or older.

: Roughly 7.5 to 9 grams, depending on your state. 3. Buying Locally vs. Online

Legal Requirements for the Sale and Purchase of Drug Products. - FDA

: This version is available directly on store shelves in the cold and flu aisle. It does not have the same purchasing restrictions as pseudoephedrine but is often cited by experts as being less effective for oral use.