What special dietary instructions should I follow? Which Works Faster? The typicaldose of Viagra is 50 mg. Seven of these companies are based in India. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. Sildenafil Viagra. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.How to save on generic Cialis There are many ways to save on Cialis, which is available as both a brand-name and generic medication. Save with GoodRx. GoodRx can help you save over 97% off the average retail price of the generic version. Generic Cialis at certain pharmacies is less than $13 with a free GoodRx discount. Tadalafil is the generic version of Cialis and is typically lower in cost. Share on Pinterest. The price for tadalafil is $ per month, while Cialis is $ How Cialis Works. Tadalafil and other PDE5 inhibitors primarily work by inducing muscle relaxation. Tadalafil stops the breakdown of a chemical responsible for relaxing muscles. In ED and PAH, the drug targets muscle cells in blood vessels. When the blood vessel muscle cells relax, this expands the vessel and increases blood flow; this .