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REX MD is an online health clinic that focuses on male health. The company sells sildenafil on a prescription-only basis. To order with REX MD, a person needs to fill out an online survey and buy viagra brand pills usa Viagra (sildenafil) is a prescription drug that s used to treat erectile dysfunction (ED). The drug comes as an oral tablet. It s usually taken as needed about 1 hour before sexual activity. Generic Viagra, known as sildenafil, is an alternative to the branded drug Viagra that can be used to treat erectile dysfunction (ED) and is available online at a fraction of the price.

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