Kamagra Effervescent 100 mg Tablet is a prescription medicine used to treat erectile dysfunction (impotence) in men. It works by increasing blood flow to the penis, helping men achieve and maintain an erection. It belongs to a group of medications called PDE5 inhibitors. You can take Kamagra Effervescent 100 mg Tablet with or without food, preferably about 1 hour before sexual activity. It usually takes 30 to 60 minutes to start working, but it only works if you're sexually aroused. Do not use this medicine if you do not have erectile dysfunction.