Nystatin 
When using Nystatin for treating pigeons, it's crucial to follow your veterinarian's instructions carefully. The medication is typically administered orally, either in the form of a solution or as a powder mixed with their food. The dosage and duration of treatment will depend on the severity of the infection and the specific instructions provided by the veterinarian.
In addition to medication, it's essential to maintain good hygiene in the pigeon loft or aviary to prevent the spread of fungal infections. Keep the environment clean and dry, provide fresh food and water, and make sure the pigeons have access to a well-balanced diet to support their overall health and immune system.
Remember that self-diagnosis and treatment of fungal infections in pigeons or any other animals can be risky and may not lead to the desired outcome. Always seek professional veterinary advice and guidance for the health and well-being of your pigeons.