It is difficult to know what the start of your son's problem was,but he had pica so eating sand caused the round worm infestation and also his constipation. He should not have has Vermox SD at his age. He can have the ordinary Vermox syrup for 3 days in 3months time when you need to repeat the dose. It would be a good idea to change his milk to either Nido or Parmalat First Growth milk. Continue with the Duphalac in the meantime.
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