A common question posed by customers of online pharmacies is: What constitutes a 90-day supply of medication? Unfortunately, there is no definitive answer. This ambiguity causes confusion and frustration, especially when orders are held by U.S. Customs and Border Protection (CBP). Many customers wish to order large quantities to save on shipping, only to face seizures and accusations of fraud against online pharmacies. This article explores the intricacies of the 90-day rule and provides practical guidelines for ordering medications online while adhering to CBP regulations to avoid issues with personal-use shipments.