Male erectile dysfunction and impotence are treated with kamagra 100mg medication. Sildenafil, an ingredient in this medication, aids in boosting blood flow to men's penile tissues. Follow your doctor's advice when taking this medication. This medication takes 5 hours to take effect. Take this medication half an hour before sexual activity. This medication can be taken both before and after food. Sildenafil, an ingredient in this medication, helps men ejaculate for longer periods of time. As prescribed by your physician, you should take this medication.