: You are prohibited from purchasing more than 9 grams within any period of 30 consecutive days.

According to the and the FDA , your ability to repurchase depends on two specific limits:

: You can typically buy more the following calendar day , provided you haven't reached your monthly limit.

The number of pills you can buy depends on the specific strength, as the limits are based on the weight of the pseudoephedrine, not the number of boxes. Claritin-D® Tablets 24 Hour

: You cannot buy more than 3.6 grams of pseudoephedrine base in a single day, regardless of the number of transactions.

Because pharmacies use electronic tracking systems like the , the system will automatically block a sale (a "stop sale alert") if your new purchase would put you over these limits based on your ID. When Can You Specifically Buy More?