I am often asked which is the best of the three most common erectile dysfunction treatments: Viagra, Levitra or Cialis. Viagra is the most well-known of the three as it has been around for over 15 years. There is no simple answer to this question, as some men find one treatment works better for them than the others. This means that a lot is known about its effects and side effects. It works within an hour of taking a tablet, and is best taken on an empty stomach. The effects of Viagra will last for four to six hours. Viagra was developed and originally marketed by the pharmaceutical company Pfizer, and until 2013 Pfizer was the only company allowed to sell it. When Pfizer’s patent on Viagra expired, the market was open for other companies to produce the medicine, albeit under its generic name Sildenafil, rather than the brand name Viagra. Sildenafil contains exactly the same active ingredient as Viagra (sildenafil citrate), and works in the same way. Sildenafil belongs to a group of medications called phosphodiesterase type 5 inhibitors. It is used for the treatment of erectile dysfunction (male impotence). It helps to achieve and keep an erection sufficient for sexual activity. It does this by allowing a greater blood flow into the penis when a man is sexually aroused. It works only with sexual stimulation and does not increase sexual desire. This medication may be available under multiple brand names and/or in several different forms. Any specific brand name of this medication may not be available in all of the forms or approved for all of the conditions discussed here. Doxycycline structure Buy retin a from india Cytotec for sale online Each blue, diamond-shaped, film-coated tablet engraved with "N" on one side and "25" on the other side, contains sildenafil 25 mg. Nonmedicinal ingredients. Viagra Ingredients Viagra. VIAGRA 25 mg, 50 mg or 100mg film-coated tablets Sildenafil citrate. The active substance of VIAGRA is Sildenafil each tablet contains 25 mg, 10 mg or 100 mg of Sildenafil as citrate. Six of the 17 products contained sildenafil the active ingredient in Viagra or a substance similar to either sildenafil or vardenafil. Vardenafil is the active ingredient in Levitra, another FDA. Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Revatio) is used to improve the ability to exercise in adults with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness). Children should not usually take sildenafil, but in some cases, a doctor may decide that sildenafil (Revatio) is the best medication to treat a child's condition. Sildenafil is in a class of medications called phosphodiesterase (PDE) inhibitors. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus (HIV). This leaflet answers some common questions about Viagra. It does not take the place of talking to your doctor or pharmacist. Your doctor has weighed the risks of you taking Viagra against the benefits they expect it will have for you. It should be used only under strict medical supervision. Viagra is used to treat erectile dysfunction, more commonly known as impotence, in men. If you have any concerns about taking this medicine, ask your doctor or pharmacist. This is when a man cannot get, or keep, a hard erect penis suitable for sexual activity. Viagra belongs to a group of medicines called phosphodiesterase type 5 inhibitors. This medicine is available only with a doctor's prescription. It works by relaxing the blood vessels in your penis when you are sexually excited. YOU MUST NOT TAKE VIAGRA IF YOU ARE TAKING NITRATES OR NITRITE MEDICATIONS. This allows blood to flow into your penis, allowing you to get an erection in the natural way. IT MAY LEAD TO A SEVERE DROP IN YOUR BLOOD PRESSURE, WHICH MAY BE DIFFICULT TO TREAT. BECAUSE SEXUAL ACTIVITY MAY PLACE A STRAIN ON YOUR HEART, YOUR DOCTOR WILL NEED TO CHECK WHETHER YOU ARE FIT ENOUGH TO TAKE VIAGRA. Sildenafil ingredients Ingredient in Chinese Herb Acts as a Natural Viagra - WebMD, Viagra IngredientsViagra Diflucan usageBuy flagyl 2000 mgWhere can i buy viagra over the counter in liverpool Sildenafil, sold as the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. Sildenafil - Wikipedia. Hidden Risks of Erectile Dysfunction 'Treatments' Sold Online. BLUECHEW - Now You Can Buy Chewable Sildenafil & Tadalafil ED.. Sildenafil citrate is a white to off-white crystalline powder with a solubility of 3.5 mg/mL in water and a molecular weight of 666.7. VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg and 100 mg of sildenafil for oral administration. Jan 15, 2018. Sildenafil learn about side effects, dosage, special precautions, and more on MedlinePlus. Each tablet contains sildenafil citrate equivalent to 20 mg of sildenafil. In addition to the active ingredient, sildenafil citrate, each tablet contains the following inactive ingredients microcrystalline cellulose, dibasic calcium phosphate dihydrate, croscarmellose sodium, magnesium stearate, hypromellose, titanium dioxide and triacetin.