Viagra or Sildenafil belongs to a group of medicines known as phosphodiesterase inhibitors. In fact it is the first drug that has been invested in the market for treatment of impotence or erectile dysfunction. Viagra works by relaxing muscles and dilating blood vessels in the penis, which in turn increases blood flow during sexual activity, helping you achieve and maintain an erection. Viagra may also be used for other purposes or medical conditions as determined by your doctor.

Important information about General Viagra
It is important to understand that Viagra or sildenafil is effective only during sexual stimulation. You should not take Viagra if you are allergic to sildenafil or similar medicinal preparations. Make sure you inform your doctor of any allergies you have to medications. Nor should take Viagra if you are taking nitrate medications including nitroglycerin ointment, nitroglycerin skin patches, pills nitroglycerin and isosorbide pills. Taking Viagra with any of these drugs would cause your blood pressure to become dangerously low.

Dosage and Administration General Viagra
You must take Viagra, or sildenafil alone as your doctor has prescribed you. Viagra is usually more effective if you take it an hour before engaging in sexual activity, however, you can take anywhere between half an hour to four hours before you engage in sexual activities. Because Viagra take only when needed, is not likely to miss dose.

If you take Cardura or other alpha-blocking drug, make sure you will not receive Viagra within four hours of taking Cardura or other alpha-blocking drug to prevent the fall of your blood pressure to dangerously low levels.

Possible Side Effects of Viagra General
The use of Viagra or sildenafil is associated with some side effects including abnormal vision, acid indigestion, diarrhea, headache, infections of the urinary tract, flushing and nasal gets congested, however, are only temporary and should resolve themselves. If not resolved, or begin to experience more severe side effects such as stroke, heart attack, cardiac arrhythmias, or a dangerous drop in blood pressure, stop taking pharmaceutical and call your doctor immediately.

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