The most common medications used to treat erectile dysfunction (ED) are Viagra, Cialis, Sildenafil, and Levitra. They belong to a class of drugs called phosphodiesterase 5 inhibitors (PDE5 inhibitors), which will be explained below. An erection occurs when someone is stimulated by an erotic thought or sexual contact. That leads to a series of chemical reactions in the blood vessels of the penis that results in 6 times the blood flow getting trapped in the penis. An erection might last indefinitely if it weren’t for chemicals called phosphodiesterases. They work at reversing the process that keeps the penis erect. Usually there is a balance between the chemicals that cause an erection and those that would return the penis to being flaccid. They pull in opposite directions with one dominating over the other in a perfect sequence that lets a man have an erection as long as it is needed. Sildenafil is a medicine used to treat erectile dysfunction. It increases blood flow to the penis to help men get an erection. At least two-thirds of men have improved erections after taking it. Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). This medicine is available on prescription and can also be bought from most pharmacies. It comes as tablets that you swallow, chewable tablets, and as a liquid that you drink. Sildenafil for erectile dysfunction (Viagra) can be taken by men aged 18 and over. Sildenafil for pulmonary hypertension (Revatio) can be taken by adults and children aged 1 and over. Do not take sildenafil if you: You can get sildenafil on the NHS if you have erectile dysfunction or pulmonary hypertension. New cheap viagra Buy bactrim sulfamethoxazole Revatio is available in 20 mg strength tablets. The recommended dose of Revatio is 20 mg three times a day. Revatio should be taken approx. 4-6 hours apart. 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Originally brought to market by Pfizer, generic versions of the drug are now produced and available by a number of pharmaceutical companies. Clinical studies have shown Viagra to be an effective treatment in close to 90% of erectile dysfunction situations, but similar studies have not been conducted on a large scale for generic Viagra-like products containing Sildenafil Citrate. Every time my wife gives me the look now it a full on Blitz! Rather than clinical trials, Sildenafil reviews from real patients are the best way to gauge the drug’s effectiveness. I was a bit uncertain about trying generic Sildenafil, but I decided to pull the trigger. I am so happy that I tried this generic Sildenafil product. The buying process was great, but I thought the product was just okay. But in a little bit over a week, I made the order, received the product, and changed my life. I felt his pain every time we gave it another shot in the bedroom. ’ Patti T., Charleston The overwhelming majority of generic Sildenafil users experience success in remedying their erectile dysfunction symptoms with the treatment. We Ship Monday through Friday Only - Orders Placed after 2 PM EST might not be shipped until the following business day. Orders placed on weekends or holidays will not be shipped until the next business day. Please allow 2-3 days additional for vet approval for orders that include prescription items, or items out of stock. Pulmonary hypertension refers to abnormally high blood pressure in the arteries of the lungs that forces the right side of the heart to work harder than normal. Sildenafil causes the smooth muscle surrounding small blood vessels in the lungs to relax, decreasing the work load on the heart. Keep this and all drugs out of reach of children and animals. This drug should only be given to the animal for which it was prescribed. 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