Final answer:
The federal limit for the OTC sale of pseudoephedrine is 3.6 grams per individual per day and no more than 9 grams per month.
Step-by-step explanation:
The maximum amount of pseudoephedrine that can be sold over-the-counter (OTC) to an individual in a single sale is federally regulated.
According to the Combat Methamphetamine Epidemic Act of 2005, the legal limit for OTC sales of pseudoephedrine is 3.6 grams per day, with a monthly limit not exceeding 9 grams. Pharmacies and retailers are also required to keep a log of such sales, and purchasers must present identification and sign for the purchase.