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- Panacur – dewormer.
- Pentobarbital – Humane euthanasia of animals not to be used for food
- Phenobarbital – Antiseizure medication
- Phenylbutazone – non-steroidal anti-inflammatory drug (NSAID)
- Pimobendan – used to manage heart failure in dogs
- Pirlimycin – antimicrobial
- Ponazuril – anticoccidial
- Praziquantel – Treatment of Dipylidium caninum, Taenia pisiformis, Echinococcus granulosis
- Prednisone –
- Propofol – short acting anaesthetic drug
- Pyrantel Pamoate – Effective against ascarids, hookworms and stomach worms.
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