How do I order a new prescription using the Online Ordering Service? We cannot accept returns. Be sure to have your prescription number available. If you need to start your medication immediately or do not have enough to last you at least two weeks, request two prescriptions from your prescriber: one for an initial short-term supply of your maintenance medication that your local retail pharmacy can fill immediately, and a second for a day supply, including the refills that can be submitted to the Mail Order Pharmacy. Visit the Costco Pharmacy site pharmacy. How do I order a refill using the Online Ordering Service?Drug details Here are some details about tadalafil: Learn more about the different dosages for Cialis here. Pros and cons at a glance Below are some advantages Missing: costco. Brand names for tadalafil include Cialis. The cost for tadalafil oral tablet 5 mg is around $27 for a supply of 90 tablets, depending on the pharmacy you visit. Quoted prices are . Find your nearest Costco Pharmacy in Los Angeles, California. View store hours, reviews, contact information and prescription savings with GoodRx.