Sour Crop can be treated with an anti-fungal/yeast medication. Miconazole or Clotrimazole can be found in stores like Walmart.
Tylan is an antibiotic commonly used to treat respiratory infection. Some may use it to treat Enteritis.
I've never seen mention of using Tylan to treat Coccidiosis. A coccidiostat like Corid (Amprolium) is commonly used to treat Coccidia overload. Sulfa Antibiotics or Toltrazuril are a couple of other commonly used treatments for Coccidiosis.
Epsom salt can be used to flush the crop, it acts like a laxative, but follow up with an anti-fungal/yeast would be needed to treat the infection.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/