Vigora 50 mg contains sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. It works by increasing blood flow to the penis during sexual stimulation, allowing for an erection to occur and be maintained.Vigora 50 mg is a specific strength of sildenafil citrate. The dosage may vary depending on individual response and tolerability. It is generally recommended to take it as needed, about 30 minutes.