The number of boxes you can buy depends on the strength and quantity of the tablets. For example, the 9-gram 30-day limit roughly equates to:
Under federal law in the United States, your purchase of Sudafed (pseudoephedrine) is restricted by weight rather than a set number of boxes. The establishes strict daily and 30-day limits for retail purchases. Federal Purchase Limits how many boxes of sudafed can i buy
The DEA Diversion Control Division limits the amount of pseudoephedrine base you can buy as follows: The number of boxes you can buy depends