As a condition of participation in the Public Education Employees Health Insurance Programs (PEEHIP), a pharmacist shall dispense a generic equivalent medication to fill a prescription for a patient covered by PEEHIP when one is available unless the physician indicates in longhand writing on the prescription, indicates by mark or signature in the appropriate place on the prescription, or indicates in an electronic prescription, the following: “medically necessary” or “dispense as written” or “do not substitute”. The generic equivalent drug product dispensed shall be pharmaceutically and therapeutically equivalent and contain the same active ingredient or ingredients, and shall be of the same dosage, form, and strength.