It is highly recommended that you give medicine to your child at least once every 6 months. If your child has abdominal pain or scratches around the anus, especially at night, or appears pale, then it is advisable to give it as soon as you notice these symptoms. I recommend either Bendex, Noworm or Zentel brands.For a child more than two years of age, if given as a syrup then 10 ml should be given half way through dinner (preferably a fatty meal – make an exception this one time 🙂 ). If you are giving a tablet then one tablet instead of 10 ml syrup. Please repeat the dose after one week to take care of any residual eggs or worms.