Ponazuril (INN) sold by the Bayer Corporation under the trade name Marquis is a drug currently approved for the treatment of equine protozoal myeloencephalitis (EPM) in horses caused by Sarcocystis neurona. More recently veterinarians have been preparing a formulary version of the medication for use in small animals such as cats and dogs against coccidia an intestinal parasite. Coccidia treatment is far shorter than treatment for EPM.
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