One last reason why Cialis and other brand name drugs are so expensive is because they have a monopoly within the 20 year patent period. Any enterprise wants to be the first to introduce a product to the market since it provides them with a considerable advantage. There was no pattern in the occurrence of side effects observed when using the drug was used casually. As you have noted, brand-name Viagra sildenafil is in the same ballpark. The HHS observes that in any functioning free market, any new competitor will usually drive the price of medications down. That dramatically reduces their opportunity to recoup from any research and development costs that they may have incurred. Cialis Side Effects Cialis is well tolerated by those who use the drug.Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether . Generic: $ to $ for ten 10 mg tablets But your out-of-pocket cost for Levitra may depend on a few different factors that can drop these costs significantly, . Viagra (sildenafil) is a brand-name oral tablet prescribed for erectile dysfunction. The cost of the drug with and without insurance can depend on several .