Washington Revised Code Title 69. Food, Drugs, Cosmetics, and Poisons § 69.41.130. Savings in price to be passed on to purchaser

Unless the brand name drug is requested by the patient or the patient's representative, the pharmacist shall substitute an equivalent drug product which he or she has in stock if its wholesale price to the pharmacist is less than the wholesale price of the prescribed drug product, and at least sixty percent of the savings shall be passed on to the purchaser.