Will Flea Medicine Cause Lethargy And Constipation In Dogs?
Will Flea Medicine Cause Lethargy And Constipation In Dogs? Side effects can include skin irritation, agitation or lethargy, vomiting, tremors and seizures. #4 When used according to label directions, the active ingredients in many flea and tick topical products are not absorbed into the bloodstream. What are the side effects of flea treatment for dogs?