The usual recommended dose is 50 mg taken as needed, approximately 30 to 60 minutes before sexual activity. However, the medication may be taken any time from 4 hours to half an hour before sexual activity. Based on the effectiveness and side effects of the medication, the dose may be increased to 100 mg or decreased to 25 mg.
The maximum recommended dose is 100 mg and it is not recommended to take more than one dose per day. Sildenafil may be taken with or without food, but taking it with a high-fat meal may increase the time before the medication starts working.
Many things can affect the dose of a medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
It is important to take this medication exactly as prescribed by your doctor. Do not take higher doses of this medication than those prescribed by your doctor. Contact your doctor if you take a greater dose of sildenafil than prescribed.
Store this medication in its original package at room temperature, protect it from moisture, and keep it out of the reach of children.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.
What form(s) does this medication come in?
25 mg
Each blue, round, diamond-shaped tablet, marked "PFIZER" on one side and "VGR 25" on the other side, contains sildenafil citrate equivalent to 25 mg of sildenafil. Nonmedicinal ingredients: anhydrous dibasic calcium phosphate, croscarmellose sodium, FD&C Blue No. 2 Aluminum Lake, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin.
Each blue, round, diamond-shaped tablet, marked "PFIZER" on one side and "VGR 25" on the other side, contains sildenafil citrate equivalent to 25 mg of sildenafil. Nonmedicinal ingredients: anhydrous dibasic calcium phosphate, croscarmellose sodium, FD&C Blue No. 2 Aluminum Lake, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin.
50 mg
Each blue, round, diamond-shaped tablet, marked "PFIZER" on one side and "VGR 50" on the other side, contains sildenafil citrate equivalent to 50 mg of sildenafil. Nonmedicinal ingredients: anhydrous dibasic calcium phosphate, croscarmellose sodium, FD&C Blue No. 2 Aluminum Lake, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin.
Each blue, round, diamond-shaped tablet, marked "PFIZER" on one side and "VGR 50" on the other side, contains sildenafil citrate equivalent to 50 mg of sildenafil. Nonmedicinal ingredients: anhydrous dibasic calcium phosphate, croscarmellose sodium, FD&C Blue No. 2 Aluminum Lake, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin.
100 mg
Each blue, round, diamond-shaped tablet, marked "PFIZER" on one side and "VGR 100" on the other side, contains sildenafil citrate equivalent to 100 mg of sildenafil. Nonmedicinal ingredients:anhydrous dibasic calcium phosphate, croscarmellose sodium, FD&C Blue No. 2 Aluminum Lake, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin.
Each blue, round, diamond-shaped tablet, marked "PFIZER" on one side and "VGR 100" on the other side, contains sildenafil citrate equivalent to 100 mg of sildenafil. Nonmedicinal ingredients:anhydrous dibasic calcium phosphate, croscarmellose sodium, FD&C Blue No. 2 Aluminum Lake, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin.
Do not take sildenafil if you:
- are allergic to sildenafil or any ingredients of this Viagra medication
- are taking any type of nitrate medication in any form (oral, sublingual [under the tongue], skin patch, or spray). Nitrate medications include nitroglycerin and related medications that are used for the relief of chest pain or angina. They also include amyl nitrite "poppers." Use of these medications with sildenafil could cause a sudden severe drop in blood pressure that could lead to dizziness, fainting, heart attack, or stroke.
- have been advised by your doctor not to engage in sexual activity
- have a history of vision problems related to nerve damage to the retina caused by decreased blood flow
Nitrates are found in medications that are used to treat angina (chest pain). If you are not sure if you are taking nitrates, ask your doctor or pharmacist.
Nitrates must NOT be taken by anyone who is using sildenafil because they can cause your blood pressure to drop very low. This may cause dizziness, fainting, heart attack, or stroke. 
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