then you may want to cut the dose in 1/2. some people get a reaction from olive leaf called the hercsizemer. i have never heard that it was more than a cleansing reaction that stops as soon as you slow down and allow the body to catch up. there are a few like myself that are allergic to certain things, with me it is coconut, it causes my throat to swell temporary. if the dewormer causes this for you, it will be the first i have heard of, but surely can happen with any food or product. if you think your that 1 person that it could, please send it back for a refund.