Used to treat erectile dysfunction in men. sildenafil citrate is found as a generic brand of. If you want to see the good effect of this medicine, take kamagra 100 one hour before sexual intercourse. The effect of kamagra tablet lasts for 4 to 6 hours. If the effect of this medicine lasts for more than 4 hours, consult a doctor immediately. Consult a doctor before using this medicine. And if you want to increase or decrease the dose of this medicine, first consult a doctor.