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Sildenafil, commonly known as Viagra, is a medication used to treat erectile dysfunction (ED) in men. It is taken orally as needed, usually about an hour before sexual activity, but can be taken anywhere from 30 minutes to 4 hours in advance. It should not be used more than once a day to avoid serious side effects such as vision loss or low blood pressure. The drug functions by inhibiting phosphodiesterase-5 (PDE-5), a protein that breaks down substances necessary for an erection. By blocking PDE-5, sildenafil allows the muscles in the penis to relax and enables increased blood flow, facilitating an erection when combined with sexual stimulation. Sildenafil does not protect against sexually transmitted infections, so it is advisable to use effective barrier methods like condoms during sexual activity. Always consult your healthcare provider before taking sildenafil or any other medications to ensure it is safe and suitable for you.