According to regulations, what must patients show to obtain medications that contain pseudoephedrine?

To obtain medications that contain pseudoephedrine, patients must present a valid ID as a regulatory requirement. This is due to pseudoephedrine's potential for misuse in the illegal production of methamphetamine. By requiring a valid form of identification, pharmacies can verify the identity of the individual purchasing the medication, track the amount purchased, and ensure compliance with state and federal laws aimed at controlling the sale of pseudoephedrine.

Other options, while they may seem plausible in various contexts, do not align with the specific regulations surrounding pseudoephedrine. For example, requiring a prescription is not standard for many over-the-counter medications unless specifically mandated by state law or particular circumstances. Similarly, a referral or a consent form is not needed for the purchase of these medications. The emphasis is primarily on identity verification through a valid ID to help combat misuse while still allowing access for legitimate use.