Men buy Viagra online at a Suitable price. Viagra is a PDE-5 inhibitor class prescribed for the treatment of erectile dysfunction in men. It contains the main amplified product Sildenafil which works by promoting more blood flow into the penis. It helps achieve and sustain a firm erection during sexual activity at any time. You can take this pill approximately 30 minutes to 1 hour before sexual intercourse. The effects of this medicine can last for around 4 to 5 hours. It should not be taken more than once in 24 hours. This medicine is not recommended for people who don’t suffer from erectile dysfunction. So before using this tablet always take your doctor’s advice.