When Can I Buy Sudafed Again Online

You are restricted to 3.6 grams of pseudoephedrine base per day.

This is not based on a calendar month (e.g., January 1st–31st). Instead, the system looks back at the previous 30 days from today. If those total purchases exceed 9 grams, you must wait until enough time has passed for an older purchase to "fall off" the 30-day window. How Much is 9 Grams? when can i buy sudafed again

Legal Requirements for the Sale and Purchase of Drug ... - FDA You are restricted to 3