Capstar Side Effects. Capstar side effects for dogs the most common side effects that affect dogs include lethargy or hyperactivity , incoordination and trembling or seizures, and nervousness. Many of the adverse effects reported in dogs and cats following the administration of capstar flea medication are excitatory effects including:
The following adverse reactions have been reported in dogs after giving program flavor tabs: What are the side effects of capstar: Hyperactivity, panting, nervousness, fever, vocalisation and an increased heart rate.