Hi Terry! You will need to present the coupon to the pharmacist, usually before, they fill a prescription. If you doctor's office is willing to do so for you then it may be okay, but we would suggest you present a new coupon each time you fill or refill. Sometimes our prices fluctuate and checking the coupons may get you a deeper discount. If you, or your doctor, presented a coupon and the pharmacist, for whatever reason, says the coupon cannot be used please give us a call at 1-888-799-2553, our Advocacy Team would love to assist you! Our hours are Monday-Sunday, between the hours of 8AM and 7PM CT.