Some brand names are Endocox or Baycox. Depending on what form you get, and what concentration, dosing will be different. Endocox comes in a powder form that you can mix in the drinking water. Baycox is a liquid that can be mixed in the drinking water. Brands in your country may be different, I would assume it's available, it's commonly used. Whether it requires a vet prescription there, I can't say.
https://www.amazon.com/Pigeons-Finches-Parakeet-Cockatiels-Parrots/dp/B0CCPG9GD1
https://www.amazon.com/Pigeons-Finches-Parakeet-Cockatiels-Parrots/dp/B0CCPG9GD1