: You can only find pseudoephedrine products behind the pharmacy counter , even though they are sold over-the-counter (OTC).

: Pharmacies use a real-time electronic tracking system (like NPLEx) to monitor sales and ensure buyers do not exceed legal limits. Legal Purchase Limits

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Exceeding these limits can result in a "stop sale" alert at the pharmacy counter and potentially lead to criminal charges for possession of precursor ingredients.

: No more than 9 grams within any 30-day window.

In Missouri , purchasing (pseudoephedrine) does not require a prescription, but it is strictly regulated as a Schedule V controlled substance . To combat illegal manufacturing, the state enforces specific purchase limits and storage requirements. Key Purchase Requirements