This document discusses advantages and disadvantages of mail order pharmacies compared to retail pharmacies. It notes that mail order pharmacies can offer more efficient dispensing, lower error rates, and 24/7 help lines. However, they only provide maintenance medications and prescriptions may take longer to reach patients. The document also explores why mail order pharmacies should have lower costs than retail pharmacies due to volume purchasing discounts and rebates. However, whether plan sponsors actually save money depends on these cost savings versus losses from lower patient copays at mail order pharmacies.