The patent on Revatio indicated for pulmonary arterial hypertension rather than erectile dysfunction expired in late If you have erectile dysfunction, the enzyme phosphodiesterase type 5 PDE5 often works too quickly to make your penis flaccid, which can make it difficult for you to get an erection in the first place or keep one for long enough to ejaculate. The patent was published in and expired in The substance is the same under both trade names. Egypt Egypt approved Viagra for sale in , but soon afterwards allowed local companies to produce generic versions of the drug, citing the interests of poor people who would not be able to afford Pfizer’s price.Viagra: the original and still the most trusted way to help men get and maintain erections. Genuine Viagra, prescribed online and delivered. Viagra® Treat erectile dysfunction with . 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 . Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in .

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