Note that it can take the FDA anywhere from 8 to 12 years to approve patents for any new drug Some of the side effects that were reported and observed while using this medication include the following: Headache As a PDE5 inhibitor, Sildenafil relaxes muscle cells found in blood vessels in the penis. Perhaps one of the reasons why pharmaceutical companies drive the prices of their drugs is because the patent period is cut down in half by the time their product hits the market. It takes years of research and development to bring a new drug to market. Apart from that, it should be remembered that these companies were established for profit. The prosecutors found evidence regarding the antibiotic doxycycline, but other generic drugs probably also were affected. · Chief among them is Martin Shkreli, the smirking so-called “pharma bro” who raised ire in when his company, Turing Pharmaceuticals, hiked the price of a life . Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether . You may already know most of the names: Cialis, Levitra, Staxyn, Stendra, Viagra. Learn more about these medications that can help men with erectile dysfunction get and .