Kamagra 100mg or Viagra is the most commonly used drug for the treatment of erectile dysfunction. It also treats other male sexual function problems. Sildenafil citrate is the salt form of the drug. It is usually used to increase blood flow to the penis to help a man sustain his erection, to enhance sexual activity. This medicine can be taken before or after a meal. Take this medicine with water but do not break or chew the medicine. Take this medicine 30 minutes before intercourse. Do not consume fatty foods or cold drinks with this medicine as it slows down the effect of the medicine.