M
- Marbofloxacin – antibiotic
- Maropitant – Antiemetic
- Medetomidine – surgical anesthetic and analgesic
- Meloxicam – non-steroidal anti-inflammatory drug (NSAID)
- Metoclopramide Hydrochloride – Potent antiemetic, secondarily as a prokinetic.
- Metronidazole – Highly effective against anaerobic bacteria. Has good activity against protozoa, but Fenbendazole may be a better choice. (more effective, less side effects)
- Milbemycin oxime – a broad spectrum antiparasitic used as an anthelmintic, insecticide and miticide
- Mirtazapine – antiemetic and appetite stimulant in cats and dogs
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