Powerful – A single dose controls all intestinal worms. Effective – Drontal consists of two distinctly different drugs, Praziquantel and Pyrantel. In combination, they provide unparalleled efficacy against internal parasites affecting cats. Convenient – There are no known incompatibilities with Drontal Allwormer, allowing other treatments to occur concurrently. Economical – Drontal Allwormer offers gentle, effective control of worms. It may be given to all cats including old animals, young kittens, pregnant queens and show animals. User Friendly – One tablet every 3 months is all it takes to control all gastrointestinal worms.