Well its most noticeable at feeding time, and sometimes when I hold him. But I watch him in his cage, and he has climbing branches, and sometimes he will climb up on them to investigate the top of his cage and you can see the swaying quite visibly. A bad reaction could make sense, as I cant say I noticed it before using the spray, but I just wanted to double check it wasn't serious. He still eats, drinks, and poops, so I haven't taken him to a vet yet. Plus, I have to save right now to take my boa to the vet since he hasn't eaten in 3 months and is losing weight.