Product Description:Active Ingredient: Sildenafil Citrate 100mg per tablet.Pack Size: 6 tablets.Manufacturer: Pfizer.How It Works:Viagra functions by inhibiting the enzyme phosphodiesterase type 5 (PDE5), leading to the relaxation of blood vessels in the penis and increased blood flow upon sexual arousal. This mechanism aids men with ED in achieving and sustaining an erection suitable for sexual activity.