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Sildenafil, commonly known as Viagra, is an oral medication used to treat erectile dysfunction (ED) in men. It is designed to be taken as needed, typically about an hour before engaging in sexual activity, although it can be taken anywhere from 30 minutes to 4 hours in advance. The drug should not be used more than once daily to avoid the risk of serious side effects like vision loss or low blood pressure. Sildenafil functions as a phosphodiesterase-5 (PDE-5) inhibitor. By blocking the PDE-5 enzyme, it facilitates an erection by relaxing certain muscles in the penis and increasing blood flow. This medication is effective only when combined with sexual stimulation. It is important to note that sildenafil does not offer protection against sexually transmitted infections (STIs) such as HIV, hepatitis B, gonorrhea, or syphilis. To reduce the risk of infection, using effective barrier methods, like latex or polyurethane condoms, during sexual activity is recommended. Always consult with a healthcare professional, such as a doctor or pharmacist, for personalized advice and to ensure the medication is safe and appropriate for your use.