The Virbac tapewormer is generic Droncit and contains exactly the same active ingredient Praziquantel. The tablet is for the control and treatment of tapeworms in cats. The dosage of the generic Droncit - the Virbac tapewormer is one tablet per 10 kg (one tablet per 22 lbs) for flea tapeworm or one tablet per 5 kg (one tablet per 11 lbs) for Spirometra tapeworm. Most adult cats require one half a tablet. The Virbac tapewormer is a lot smaller and easier to administer than the droncit tablets. Price is per tablet.