It was brought to my attention years and years ago that ivermectin is incredibly sensitive to sunlight and should not be sitting around outside of the box, especially if it is in a clear bottle. Several brands including Durvet put it in a brown glass bottle, but others like Norbrook do not for whatever reason.
I left a bottle of injectable Norbrook brand hanging on the side of the chute years ago and a visiting DVM told me to take it to the trash immediately as it was guaranteed to be ineffective due to the sunlight exposure. This is the basis of my concern. Don’t know why I just thought about it now after nearly 2 years of ivermectin discussions.
In keeping with the theme of cool dark places, here’s “Fishin’ in the Dark” by the Nitty Gritty Dirt Band.