Piperazine Citrate Worm Tablets Dosage and administration Preliminary fasting and subsequent purging are unnecessary and a single dose is usually adequate. Dogs and cats 200 mg/kg (1 tablet per 2.5 kg bodyweight: ½ tablet per 1.25 kg bodyweight). Repeat treatment at 3 monthly intervals. Puppies and kittens should be treated at 2 weeks of age and every 2 weeks until 12 weeks of age. Thereafter they should be treated at 3 month intervals. Nursing bitches and queens should be treated 2 weeks after giving birth and every 2 weeks until weaning. It is advisable to treat bitches and queens at the same time as the puppies or kittens.