· Revatio Viagra Descriptions Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines .Use the oral syringe provided with your medication to measure and take your dose. If used together, your doctor may change the dose or how often you use this medicine, or give you special instructions about the use of food, alcohol, or tobacco. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. 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. Side Effects Along with its needed effects, a medicine may cause some unwanted effects.Learn more about some of the side effects Viagra may cause. Low blood pressure. Available strengths: 25 mg, 50 mg, mg. Viagra comes in these .  · Revatio Viagra Descriptions Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines .  · decrease in amount of urine or the frequency of urination. decreased vision. difficulty in concentrating. dizziness or lightheadedness, especially when getting up .Angina severe chest pain , unstable or Arrhythmia irregular heartbeat, within the last 6 months or Blood vessel problems eg, aortic stenosis, idiopathic subaortic stenosis or Heart attack within the last 6 months or Heart failure or Hypertension high blood pressure or Hypotension low blood pressure or Retinal disorders eye problem or Retinitis pigmentosa an inherited eye disorder or Stroke within the last 6 months —Should not be used in patients with these conditions. Leukemia blood related cancer or Multiple myeloma blood related cancer or Sickle-cell anemia blood disorder —Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur. Dosing The dose of this medicine will be different for different patients. How should this medicine be used? If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine.