Mail-Order Pharmacy

A mail-order pharmacy dispenses maintenance medications in 90-day supplies and ships them directly to the patient's home. Plans typically incentivize mail-order for long-term prescriptions — statins, blood pressure medications, diabetes drugs, thyroid replacement — through lower copays (often two months' copay for a three-month supply) or through mandatory mail-order after the first fill or two.

The economics work for plans because 90-day dispensing at a central facility has lower per-unit dispensing costs than 30-day retail dispensing, and because central pharmacies can source drugs at bulk pricing. The tradeoff for members is delivery timing (running out because a shipment was delayed), lack of pharmacist face-time for counseling, and the friction of switching from a local pharmacy relationship. PBM-owned mail-order pharmacies (Caremark Mail Service, Express Scripts Pharmacy, OptumRx Home Delivery) dominate the space. For most stable maintenance medications, mail-order is genuinely convenient and lower-cost. For medications where the dose is changing or where the patient needs pharmacist involvement, retail is still the better fit.

The takeaway: for stable, long-term prescriptions, mail-order at 90-day supply usually saves money and reduces the number of pharmacy trips. For new prescriptions or ones with frequent dose changes, stay with retail until the regimen is settled.