That is why I suggested the one from Foys. Both Tylosin and doxycycline are drugs that may treat MG or mycoplasma. I just don’t know if the dosage they give for pigeons is the same a for chickens. Some do use that on their own. You can also get just plain doxycycline as well. The big container of Tylan will last a long time, since dosage is 1 tsp or 5 grams per gallon of water for 3-5 days.Would this have too much extra stuff in it? Their other Tylan products are not in stock.
https://www.jedds.com/shop/tylodox-100g-medpet/