What to consider. Cost. Overdose. Ask your doctor. Q&A. Drug Images. What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that .Medicines that block an enzyme called CYP3A4. Side effects Side effects of oral ED medicines are often mild. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Do not start these medications while taking sildenafil without discussing it with your healthcare provider. If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. · Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called . What to consider. Cost. Overdose. Ask your doctor. Q&A. Drug Images. What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that .You may take this medicine with or without food. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. The amount of medicine that you take depends on the strength of the medicine.

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