They have the same benefits and risks as their brand-name counterparts. Insurance: If you plan to use insurance, make sure the online provider accepts it. If you have insurance, compare the GoodRx price to your insurance co-pay and see which is cheaper. Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. An erection results from an increase in blood flow to the penis. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. It’s available in 50 mg, mg, and mg tablets.Both treatment options are available in doses of 5, 10, and 20 mg. The costs are: Cialis: A prescription of 30 Cialis pills costs $ Tadalafil: 30 tadalafil pills are available for $ Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ The lowest GoodRx price for the most common version of Sildenafil is around $, 95% off the average retail price of $ Read more about Sildenafil. Tablet No data Dosage mg 5mg 10mg 20mg No data Quantity 5 6 10 15 30 90 No data.