You may take it up to 4 hours before sexual activity. Follow all directions on your prescription label. Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. The National Solar Observatory (NSO) is the national center for ground-based solar physics in the United States (www.nso.edu) and is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation Division of Astronomical Sciences.The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 to promote the progress of science. Shake the oral suspension (liquid) before you measure a dose. Stores lower doses of vardenafil with itraconazole or ketoconazole or the how jelly injectable form. PFMThe easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. It is not clear whether sildenafil is the actual cause of vision loss.Viagra is not expected to harm an unborn baby. You could be having a serious side effect of sildenafil.Store at room temperature away from moisture and heat.Since Viagra is used as needed, you are not likely to miss a dose.Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.Drinking alcohol with this medicine can cause side effects.Grapefruit and grapefruit juice may interact with sildenafil and lead to unwanted side effects. Learn about side effects, warnings, dosage, and more.

Tell your doctor about all your current medicines and any you start or stop using, especially:drugs to treat high blood pressure or a prostate disorder;medications used to treat pulmonary artery hypertension.This list is not complete. Do not take Viagra more than once per day.Viagra can help you have an erection when sexual stimulation occurs. You may take it up to 4 hours before sexual activity. Tell your doctor if you are breast-feeding a baby.Do not give this medicine to anyone under 18 years old without medical advice.Take Viagra exactly as it was prescribed for you. You may report side effects to FDA at 1-800-FDA-1088.Do not take Viagra with similar medications such as avanafil (Stendra), tadalafil (Cialis) or vardenafil (Levitra). A prolonged erection (priapism) can damage the penis.Stop using Viagra and get emergency medical help if you have sudden vision loss.You should not use Viagra if you are allergic to sildenafil, or:if you take other medicines to treat pulmonary arterial hypertension, such as riociguat (Adempas).Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems. Produced by Ajanta Pharma of India, Kamagra is used to treat erectile dysfunction. Because the U.S. Food and Drug Administration (FDA) has not approved Kamagra in jelly, tablets or any other form, this drug may not be the same quality as Viagra and other FDA-approved versions of sildenafil. Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. This has occurred in a small number of people taking sildenafil, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoked or were over 50 years old. Do not take this medicine in larger or smaller amounts or for longer than recommended.Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. Viagra relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body.Viagra is used to treat erectile dysfunction (impotence) in men. We comply with the HONcode standard for trustworthy health information -

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