Oral: Initial dose: 5 or 20 mg orally three times a day, 4 to 6 hours apart Maximum dose: 20 mg orally three times a day Injection: Initial dose: or 10 mg IV bolus three times a day .Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. It continues to work for up to 4 hours, although its action is usually less after 2 hours. If you have an erection that lasts more than 4 hours, get medical help right away. 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. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. Before taking sildenafil, tell your doctor and pharmacist if you are allergic to sildenafil, any other medications, or any of the ingredients in sildenafil tablet or suspension.What is sildenafil? Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an intravenous (IV) form, . This medicine is available on prescription and you can also buy it from most pharmacies. It comes as standard tablets, chewable tablets, and as a liquid that you swallow. Key facts. It usually takes 30 to 60 minutes for sildenafil to work for erectile dysfunction. You can take it up to 4 hours before you want to have sex. 50 mg mg Typical dosages The following information describes commonly recommended dosages for ED. However, be sure to take the dosage your doctor .The best time to take sildenafil is about 1 hour before sexual activity, but you can take the medication any time from 4 hours to 30 minutes before sexual activity. Figure 6. Do not take it more than 3 times a day. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. In many of the studies, of both fixed dose and titration designs, daily diaries were kept by patients.

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