Zenegra 50 mg contains sildenafil citrate, a medication primarily used to treat erectile dysfunction (ED) in men. The active ingredient in Zenegra 50 mg is sildenafil citrate. It belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation, resulting in an erection. Zenegra is available in various strengths, including 50 mg. The recommended starting dose of Zenegra for most men is 50 mg, taken approximately 30 minutes to 1 hour before sexual activity. Depending on individual response and tolerability, the dosage may be adjusted by a healthcare provider.