Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. You can take it in a small dose daily or in a larger dose as needed. The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. It works for up to 36 hours. Side effects Side effects of oral ED medicines are often mild. The products discussed in this site may have different product labeling in different countries.Refill and transfer prescriptions online or find a CVS Pharmacy near you. Shop online, see ExtraCare deals, find MinuteClinic locations and more. The cost for sildenafil oral tablet mg is around $10 for a supply of 2 tablets, depending on the pharmacy you visit. Quoted prices are for cash-paying customers and are not . Viagra (sildenafil) as low as. $ View other PDE5 Inhibitors. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat .