Kamagra Reviews The active ingredient in the drug is Sildenafil. This medicine is taken for ED problem in men. Taking this medicine helps men to get long lasting sexual erection. Kamagra medicine is taken in different doses. This medicine is taken 30 minutes before intercourse. The effect of this medicine is observed for 4 to 5 hours. Kamagra drug makes the sex life of men enjoyable. It is important to consult a doctor before taking this medicine.