You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. If you ever need emergency medical treatment for a heart problem, the healthcare providers who treat you will need to know when you last took sildenafil. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Make sure you have discussed any other medications you are currently taking or plan to take before starting sildenafil with your doctor and pharmacist. Do not take a double dose to make up for a missed one.drugs other than Viagra that are used for erectile dysfunction (ED), such as: tadalafil ; vardenafil ; drugs used for pulmonary arterial hypertension, including sildenafil . Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes . Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud’s phenomenon. It is unclear if it is effective for treating sexual See more.

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