Which medication is classified as Behind the Counter (BTC)?

Pseudoephedrine is classified as a Behind the Counter (BTC) medication due to its potential for misuse and production of methamphetamine. This designation requires pharmacies to maintain stricter controls over its sale to prevent diversion. When a patient wishes to purchase pseudoephedrine, they must provide identification, and the transaction is recorded in a log, which helps to monitor and limit the quantity that can be purchased within a certain timeframe.

In contrast, other medications listed, such as ibuprofen, acetaminophen, and diphenhydramine, are available on the shelf and do not have the same restrictions because they are not associated with high potential for abuse or misuse. This is why pseudoephedrine is the only choice that is classified as Behind the Counter in this scenario.