A medication called Filagra is intended to treat male erectile dysfunction. It is a member of the phosphodiesterase type 5 inhibitor drug class, which acts by boosting blood flow to the penis during erotic stimulation. Follow the doctor's instructions when using this tablet. Never use these medications in more or less than is advised. Back pain, nausea, stuffy nose, headaches, blurred vision, and flushing in the face, neck, or chest are among the side effects of filagra. Before engaging in sexual activity, take one pill of filagra and drink one glass of water.