Viagra VGR 100 tablet is a blue, four marked with Pfizer on one side of the pill and VGR 100 is on the opposite side of the pill. This drug has 100 mg of sildenafil citrate, the key component in Viagra. This medication is given to those patients who are above the age of 18 or married men to address erectile dysfunction, aiding in enhancing blood circulation to the patient's penis to support the attainment and preservation of an erection suitable for sexual intercourse.