Stop using Viagra and get emergency medical help if you have sudden vision loss. Before taking this medicine. You should not use Viagra if you are allergic to sildenafil, or: if .An inherited eye disease that affects the retina. Do not use a kitchen teaspoon as it will not measure the right amount. Your doctor will discuss the best treatment plan for you. Oral medicines for ED usually work well and cause few side effects. Do not use this medicine if you are also using a nitrate medicine, often used to treat angina or high blood pressure. Using alcohol or tobacco with certain medicines may also cause interactions to occur.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. If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn’t list its phone number and . VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Not actual size. Tell all your healthcare providers that you take VIAGRA. If you need emergency medical care for a heart problem, it will be important for your healthcare provider to know when you last took VIAGRA. Do not take VIAGRA if you: take any medicines.When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. It might work longer if you have mild to moderate erectile dysfunction. Severe liver disease. Tadalafil Cialis. Follow your doctor’s orders or the directions on the label. If too much is used, the chance of side effects is increased.

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