It is advised to begin with one 50 mg Kamagra tablet. It is not recommended to take sildenafil or kamagra more than once a day. One pill should be taken with a glass of water approximately one hour before the patient plans to have intercourse. A guy needs to be sexually excited in order for this drug to assist him achieve an erection. Each person experiences the drug's effects differently, but generally speaking, it takes between 30 and 60 minutes to start working.