“Sandy Chung is grappling with a new kind of request at her pediatrics office in Fairfax, Va.: prescriptions for aspirin and diaper-rash cream.

Patients are demanding doctors’ orders for over-the-counter products because of a provision in the health-care overhaul that slipped past nearly everyone’s radar. It says people who want a tax break to buy such items with what’s known as flexible-spending accounts need to get a prescription first.”