We had our first case of sour crop this past week which was also accompanied by a wry neck. Nice treating both things!! I was unable to secure some nystatin, so I purchased some clotrimezole vagina cream and gave the hen 1cc orally twice a day. Today her crop was way down with only a little of the liquid...and no smell anymore. I posted this to let folks know that it is safe and works great! Unfortunately, we also have to treat her with prednisone/vit. E/Selenium for wry neck which is also much better. She's had her head up all day today!!