I treated two hens today with an equine Ivermectin. The manager at the local feed store suggested it and showed me how to dose the girls properly. When I went outside a little after dark this evening one of my hens was not in the coop in her usual spot. I found her hunkered in the dirt under a bush. I picked her up, inspected her for possible wounds, and carried her to the coop. When I put her down she just fell on her face. I picked her up and put her down again and she just kept falling, as though, her legs could not hold her up. I had to move her next to the other chicken who seems fine and is not displaying any atypical behaviors. Has anyone had this same experience? Do you know of any possibly harmful side effects with Ivermectin, and a way to reverse these side effects? The lethargic hen is a Black Maran, not sure if this matters.