The clinically proven drug sildenafil is used to treat erectile dysfunction by increasing blood flow to the penis, which improves sexual performance. For best effects, a starting dose of 50 mg is usually advised, given about an hour before engaging in sexual activity. Individual response and tolerance will determine whether the dosage is lowered to 25 mg or increased to a maximum of 100 mg. It is crucial to speak with a healthcare provider to find the right dosage for you, one that will be safe and effective in producing the intended results.