Viagron 100mg is a prescription medication used to treat male erectile dysfunction (ED). It is a phosphodiesterase type 5 (PDE-5) inhibitor, which helps to improve blood flow to the penis during sexual stimulation, helping to achieve and maintain an erection. Each tablet contains 100mg of sildenafil. It should be taken 30 minutes to 1 hour prior to sexual activity, with or without food. Common side effects of Viagron include headache, flushing, upset stomach, blurred vision, and muscle pain.