Drug Uses
Viagra is used to treat impotence in men. Viagra increases the body's ability to achieve and maintain an erection during sexual stimulation. Viagra does not protect you from getting sexually transmitted diseases, including HIV.

How Taken
For most patients, the recommended dose is 50 mgs taken approximately 1 hour before sexual activity. However, Viagra may be taken anywhere from four hours to half an hour before sexual activity. Based on effectiveness and tolerance, the dose may be increased to a maximum recommended dose of 100 mgs or decreased to 25 mgs. Sexual stimulation is necessary to obtain an erection. Viagra is usually effective for up to four hours. It is less effective if taken after a high fat meal. Viagra should not be used more than once a day.

Warnings/Precautions
Before taking Viagra, tell your doctor if you have had a heart attack, stroke, or life–threatening irregular heartbeats within the last six months; have a history of heart failure; have coronary artery disease; have angina; have high or low blood pressure; have liver problems; have kidney problems; have ever had blood problems, including sickle cell anemia or leukemia; have a bleeding disorder; have a stomach ulcer; have retinitis pigmentosa (an inherited condition of the eye; have a physical deformity of the penis such as Peyronie's disease; have a condition that could lead to prolonged and painful erections, such as a tumor of the bone marrow, sickle cell anemia, or leukemia; or are taking another medicine to treat impotence. You may not be able to take Viagra, or you may require a dosage adjustment or special monitoring during treatment if you have any of the conditions listed above. Although Viagra is not indicated for use by women, it is in the FDA pregnancy category B. This means that Viagra is not expected to be harmful to an unborn baby. Viagra should not be taken by women. It is not known whether Viagra passes into breast milk. Viagra should not be taken by women. If you are over 65 years of age, you may be more likely to experience side effects from Viagra. Your doctor may prescribe a lower dose of this medication.

Missed Dose
Viagra is used as needed, so you are not likely to miss a dose.

Side Effects and Warnings
Sildenafil Citrate would not be effective in men that have erectile dysfunction caused by severe arterial deformities, loss of tubular smooth muscle cells, or incompressible cavernosal veins. Sildenafil Citrate has very minor to moderate side effects, which usually last a few minutes to a few hours after dosage. This drug can also cause dilation of blood vessels in other parts of the body, causing headaches and fainting.
Other side effects include:

• Blurred vision
• Dyspepsia
• Facial flushing
• Rhinitis
• Sensitivity to light
• Upset stomach

These side effects occur more often as the dosage increases. The most serious side effect would be blue tinted vision. Sildenafil Citrate can also block the breakdown of cyclic GMP in the cone cells of the retina in some way that leads to this perception of blue. Contact lenses with tiny electrodes which record the retina's electrical activity can be used to determine how Viagra affects this blue vision in the long term. Laboratory tests have concluded that there is no evidence of abnormalities or an increased heart rate caused by Sildenafil Citrate.

Storage
Keep Viagra out of the reach of children. Keep Viagra in its original container. Store at 25°C (77°F); excursions permitted to 15–30°C (59–86°F).

Overdose
Seek emergency medical attention. Symptoms of a Viagra overdose are not known, but are likely to include chest pain, dizziness, an irregular heartbeat, and swelling of the ankles or legs.

More Information
If you take any medicines that contain nitrates – either regularly or as needed – you should never take Viagra. If you take Viagra with any nitrate medicine or recreational drug containing nitrates, your blood pressure could suddenly drop to an unsafe level. You could get dizzy, faint, or even have a heart attack or stroke. Nitrates are found in many prescription medicines that are used to treat angina. Viagra is only for patients with erectile dysfunction. Viagra is not for newborns, children, or women. Do not let anyone else take your Viagra. Viagra must be used only under a doctor?s supervision.

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