Decoquinate is a quinolone derivative that is used in the control of coccidiosis in domestic animals. Decoquinate treats and prevents coccidiosis in chickens, cattle, goats, sheep, etc. Decoquinate acts on sporozoites development and prevents their penetration of the gut epithelium. Decoquinate inhibits mitochondrial respiration and electron transport in Eimeria.

Diclazuril is a main component of veterinary drugs used for the treatment of coccidiosis (chickens, turkeys, rabbits, etc) and equine protozoal myeloencephalitis (horses). When used for the treatment of coccidiosis, it acts by causing the degeneration of schizonts and gamonts. While in the animals affected by protozoal myeloencephalitis the drug is believed to inhibit merozoite production. In vivo experiments on horses have shown that the drug may cross the blood brain barrier.

Imidocarb is a carbanilide derivative with antiprotozoal activity. It is usually administered as the dipropionate salt. Imidocarb is a drug sold under the brand name Imizol and is used to treat canine ehrlichiosis. wo mechanisms of action have been proposed: As the effect of imidocarb on Trypanosoma brucei is antagonized by excess polyamines, it is has been suggested that imidocarb interferes with their production and/or use. Imidocarb blocks the entry of inositol into erythrocytes containing Babesia, resulting in starvation of the parasite. It is generally accepted in that imidocarb has anticholinesterase activity.

Dinitolmide (also known as zoalene) is a nitrobenzamide coccidiostat developed by Dow Company. The drug is approved by FDA for the prevention and control of coccidiosis in chickens and turkeys. Dinitolmide is hazardous for man as it may cause mutations. Thus the substance should be handle with extreme caution.

Azanidazole (or Triclose), an antitrichomonal agent that is used to treat the vaginal trichomoniasis in Italy. This drug causes genotoxicity in liver and kidney that is not separated from its biological activity.

CHINIOFON, an iodoxyquinolin sulphonate derivative, is an antiprotozoal agent used in the treatment of amebiasis. It radiolabelled form can be used in radioisotope scanning.

Toltrazuril (Baycox, Procox, Tolcox, Toltrazuril) is a veterinary drug approved in Europe for the treatment of parasitic infections caused by roundworms and coccidia. In dogs it is used in combination with emodepside (Procox).

Melarsoprol is an organoarsenic compound that was used for the treatment of sleeping sickness (African trypanosomiasis) since 1949. Melarsoprol is used for the treatment of second-stage infection (involving the central nervous system). It is the only available therapy for second-stage Trypanosoma brucei rhodesiense (East African) infection. Melarsoprol is a prodrug, upon administration it is metabolized to the active form melarsen oxide, which acts by interacting with protein sulfhydryl groups and subsequently inactivating enzymes. A small but adequate amount of the drug penetrates the cerebrospinal fluid, where it is taken up and concentrated by trypanosomes. Due to the high toxicity of the drug, it is administered only in the most dangerous cases. Melarsoprol is not commercially available in the USA, but it is available as treatment IND from CDC.

Arprinocid is a coccidiostat used in veterinary medicine. Effective against coccidiosis in poultry.

Buparvaquone is a second-generation hydroxynaphtaquinone with novel features that make it an effective compound for the therapy and prophylaxis of all forms of theileriosis. It has shown promising activities against Leishmania spp. and Neospora caninum infection. In combination with arteether it is effective against Babesia equi. Buparvaquone directly inhibits the respiration of Theileria parasites. Due to the inhibiting effects of theileriosis on the immune system, vaccination should be delayed until the animal has recovered from theileriosis. Localised, painless, oedematous swelling may occasionally be seen at the injection site.