OK...your options are probably a bit different than here in the USA. If you have a farm supply store or a vet nearby, ask them for medicine to get rid of parasites (worms) in your chickens. Some of the brands we have here my not be available there but a very common 1 here is Ivermectin or Stromectol. It's also used to tread threadworm infections in humans so you may be able to get it from a regular doctor there as well. I would check anywhere that you can get medicine or feed for chickens, cattle, sheep, goats or other livestock as it is used as a wormer (to get rid of parasitic worms) in many types of animals.
