Zenegra 100 mg is a prescription medicine used to treat erectile dysfunction (ED) in adult men. It contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor that works by increasing blood flow to the pill during sexual stimulation, helping achieve and maintain a firm erection. However, serious side effects such as chest pain, sudden vision or hearing loss, severe dizziness, or an erection lasting more than 4 hours require immediate medical attention. People taking nitrate medications or those with serious heart conditions should avoid using Zenegra 100 mg unless prescribed by a healthcare professional. https://www.genericday.com/zenegra-100-mg.html