Men with erectile dysfunction and impotence can benefit from using kamagra gel . An ingredient in the medication called sildenafil helps men's penile tissue receive more blood flow and relaxes their nerves. Take this medication half an hour before sexual activity. This medication can be taken either before or after food. This medication has side effects as well, so follow your doctor's advice when taking it. This medication has a 40-hour half-life. Don't take this medication with cold beverages or fatty meals.