Eighty-eight members of the House of Representatives fired off a letter Monday to postmaster general and CEO of the U.S. Postal Service Patrick Donahoe urging the agency not to eliminate Saturday delivery of mail, saying it would impede the ability of people who depend on mail-order pharmacies to receive their medications.

It's no secret that the retail pharmacy industry and pharmacy benefit managers don't always see eye-to-eye, with the latter being the main provider of mail-order pharmacy services in the country and often touting them as an alternative to going to the drug store, while the former emphasize the face-to-face interaction with pharmacists not usually possible with mail-order. But between the back-and-forth, millions of patients still depend on mail order pharmacy, and the cost effectiveness that mail-order pharmacies frequently promote themselves as offering could be at risk if they must use more expensive delivery methods.