Trilostane is not an aromatase inhibitor and hence does not inhibit the conversion of androgens like androstenedione and testosterone into estrogens like estrone and estradiol.[1] However, trilostane may nonetheless inhibit estrogen synthesis by inhibiting androgen synthesis.[1]
Trilostane is metabolized in the liver.[1] The major metabolite of trilostane is 17-ketotrilostane.[1] The conversion of trilostane into 17-ketotrilostane is reversible, suggesting that trilostane and 17-ketotrilostane undergo interconversion in the body.[1] 17-Ketotrilostane circulates at 3-fold higher levels than trilostane and is more active than trilostane as a 3β-HSD inhibitor.[1] The elimination half-lives of trilostane and 17-ketotrilostane are both 1.2 hours, with both compounds cleared from the blood within 6 to 8 hours of a dose of trilostane.[1] 17-Ketotrilostane is excreted by the kidneys.[1]
Trilostane was approved in the United States in 2008 for the treatment of Cushing's disease (hyperadrenocorticism) in dogs under the brand name Vetoryl.[27] It was available by prescription in the United Kingdom for dogs under the Vetoryl brand name for some time before it was approved in the United States.[12] The drug is also used to treat the skin disorder Alopecia X in dogs.[22][28][29]
Trilostane was the first drug approved to treat both pituitary- and adrenal-dependent Cushing's in dogs.[citation needed] Only one other drug, Anipryl (veterinary brand name) selegiline, is FDA-approved to treat Cushing's disease in dogs, but only to treat uncomplicated, pituitary-dependent Cushing's.[30] The only previous treatment for the disease was the use of mitotane (brand name Lysodren) off-label.[31][32]
A number of compounding pharmacies in the United States sell trilostane for dogs.[citation needed] Since the United States approval of Vetoryl in December 2008,[27] compounding pharmacies are no longer able to use a bulk drug product for compounding purposes, but must prepare the compounded drug from Vetoryl.[33]
Society and culture
Legal status
In March 2024, the Committee for Veterinary Medicinal Products (CVMP) of the European Medicines Agency adopted a positive opinion, recommending the granting of a marketing authorization for the veterinary medicinal product Trilocur, oral suspension for dogs.[2] The applicant for this veterinary medicinal product is Emdoka.[2] In March 2024, the CVMP adopted a positive opinion, recommending the granting of a marketing authorization for the veterinary medicinal product Trilorale, oral suspension for dogs.[3] The applicant for this veterinary medicinal product is Axience.[3] Trilocur and Trilorale were approved for medical use in the European Union in May 2024.[34][35]
Generic names
Trilostane is the generic name of the drug and its INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name, BANTooltip British Approved Name, and JANTooltip Japanese Accepted Name.[6][7] Its developmental code name was WIN-24,540.[6][7]
Brand names
Trilostane has been marketed under a number of brand names including Desopan, Modrastane, Modrenal, Trilox, Vetoryl, Oncovet TL and Winstan.[6][7]
Availability
Trilostane is available for veterinary use in countries throughout the world.[36]
Veterinary uses
Trilostane is used for the treatment of Cushing's syndrome in dogs. The safety and effectiveness of trilostane for this indication were shown in several studies.[26][31] Success was measured by improvements in both blood test results and physical symptoms (normalized appetite and activity level, and decreased panting, thirst, and urination).[26][31]
^ abc"Trilocur EPAR". European Medicines Agency. 13 March 2024. Retrieved 20 March 2024. Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
^ abc"Trilorale EPAR". European Medicines Agency. 13 March 2024. Retrieved 20 March 2024. Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
^ abc"Vetoryl-Contraindications". NOAH Compendium of Animal Health-National Office of Animal Health UK. Archived from the original on 17 February 2013. Retrieved 3 April 2011.
^de Gier J, Wolthers CH, Galac S, Okkens AC, Kooistra HS (April 2011). "Effects of the 3β-hydroxysteroid dehydrogenase inhibitor trilostane on luteal progesterone production in the dog". Theriogenology. 75 (7): 1271–1279. doi:10.1016/j.theriogenology.2010.11.041. PMID21295836.
^Takizawa I, Nishiyama T, Hara N, Hoshii T, Ishizaki F, Miyashiro Y, et al. (November 2010). "Trilostane, an inhibitor of 3β-hydroxysteroid dehydrogenase, has an agonistic activity on androgen receptor in human prostate cancer cells". Cancer Letters. 297 (2): 226–230. doi:10.1016/j.canlet.2010.05.015. PMID20831980.
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