Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy NAION. Do not use more of it and do not use it more often than your doctor ordered. Use protective measures and ask your doctor if you have any questions about this. Ask your pharmacist for a list of the ingredients. Men with unstable angina severe chest pain that can spread to the neck, shoulder, and arms from cardiac failure or coronary artery disease should not take VIAGRA. This medicine is available on prescription and you can also buy it from most pharmacies.Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. The usual dose is 50mg, when you need it. Do not take it more than once a day. The dose can be increased to mg or decreased to 25mg depending on its effect. Take sildenafil up to 4 hours before you want to have sex. AdMany Americans pay far too much for their prescriptions. We’re here to help. Compare pharmacy prices in your area, get the free coupon, & see how much you can save! has been visited by K+ users in the past month.  · Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .