Side Effects Of Sentinel. In dogs and puppies, the concurrent use of sentinel flavor tabs and capstar tablets is indicated to kill adult fleas and prevent eggs from hatching. The effects of sentinel flavor tabs, which prevent and control flea populations, and capstar tablets, which treat flea infestations are combined to provide a flea management system.

Lymphoedema in the arm (built up of lymph fluid) causing swelling, pain or discomfort. Sentinel® may result in these side effects: Convulsions, depression/lethargy, skin congestion, pruritus, urticaria , diarrhea, hypersalivation, anorexia, vomiting, ataxia, and weakness.