Tiludronic acid

Tiludronic acid
Clinical data
Trade names Skelid
AHFS/Drugs.com International Drug Names
ATC code M05BA05 (WHO)
CAS Number 89987-06-4 YesY
PubChem (CID) 60937
DrugBank DB01133 N
ChemSpider 54905 N
KEGG D08599 N
ECHA InfoCard 100.121.105
Chemical and physical data
Formula C7H9ClO6P2S
Molar mass 318.609 g/mol
3D model (Jmol) Interactive image
 NYesY (what is this?)  (verify)

Tiludronic acid (INN; also known as tiludronate) is a bisphosphonate used for treatment of Paget's disease of bone (osteitis deformans) in human medicine. It has the tradename Skelid. In veterinary medicine, tiludronic acid is used to treat navicular disease and bone spavin in horses. Its tradenames are Tildren and Equidronate. It is approved for treatment of navicular disease and distal tarsal osteoarthritis in Europe,[1] and was approved for treatment of navicular disease in the United States in 2014.

Mechanism of action

Tiludronate is a non-nitrogenous bisphosphonate that inhibits osteoclasts, the primary cell responsible for the breakdown of bone required for bone remodeling. Non-nitrogenous bisphosphonates are metabolized by osteoclasts to compounds that then replace a portion of the adenosine triphosphate (ATP) molecule, making it non-functional. These non-functional molecules then competitively inhibit ATP in the cell, reducing cell energy and leading to apoptosis.[2] Decreased levels of osteoclasts subsequently reduce the degree of breakdown of bone and bone turnover. Non-nitrogenous bisphosphonates are less potent relative to nitrogenous bisphosphonates.

Use in equine medicine

Tiludronate has been used primarily for the treatment of diseases in horses that are associated with inappropriate osteolysis, such as navicular disease[3] and osteoarthritis. It has specifically been shown to improve lameness in horses with osteoarthritis of the distal hock joints (bone spavin)[4] and vertebral column.[5]

Method of administration

Tildren is administered intravenously. It is labeled for 0.1 mg/kg dosing, once daily for 10 days by slow intravenous injection, which for a 500 kg horse works out to be 1 vial per day. However, one study giving all 10 doses at once (1 mg/kg IV as a single CRI) was found to have the same pharmacological effects, and is used clinically.[6] It may be given systemically or locally, by regional limb perfusion. Although RLP is thought to have certain benefits, including decreased cost and reduced risk of adverse effects, some diseases must be treated systemically, such as osteoarthritis of the vertebral column. Systemic administration is often given by adding a 1 mg/kg dose into a 1 liter fluid bag, which is slowly given over 60–90 minutes. Its effects are reported to last 4 months or longer, with a peak effect 6–8 weeks post treatment.[7] The effects of regional limb perfusion has come into question due to in vitro studies showing that high doses given by RLP or intraarticular injection may damage articular cartilage by chondrocyte apoptosis.[8] Further studies are needed to evaluate the safety of Tildren administration via RLP.

Adverse reactions and contraindications

Tildren has been shown to have several adverse effects.[9]

It is not recommended for animals under four years of age, due to lack of studies evaluating its safety in growing animals, nor for pregnant or lactating animals, since its effect on the fetus has not been studied.


  1. Kamm L, McIlwraith W, Kawcak C. A review of the Efficacy of Tiludronate in the Horse. Journal or Equine Veterinary Science. Vol 28(4): 209-214.
  2. Rogers MJ, Crockett JC, Coxon FP, Monkkonen J. 2011. Biochemical and molecular mechanisms of action of bisphosphonates. Bone 49:34-41
  3. DENOIX, J.M., THIBAUD, D. and RICCIO, B. (2003), Tiludronate as a new therapeutic agent in the treatment of navicular disease: a double-blind placebo-controlled clinical trial. Equine Veterinary Journal, 35: 407–413. doi: 10.2746/042516403776014226
  4. GOUGH, M. R., THIBAUD, D. and SMITH, R. K. W. (2010), Tiludronate infusion in the treatment of bone spavin: A double blind placebo-controlled trial. Equine Veterinary Journal, 42: 381–387. doi: 10.1111/j.2042-3306.2010.00120
  5. V. Coudry, D. Thibaud; B. Riccio; F. Audigié; D. Didierlaurent; M Denoix. Efficacy of tiludronate in the treatment of horses with signs of pain associated with osteoarthritic lesions of the thoracolumbar vertebral column. American Journal of Veterinary Research. Vol. 68, No. 3, Pages 329-337 March 2007
  6. DELGUSTE, C., AMORY, H., GUYONNET, J., THIBAUD, D., GARNERO, P., DETILLEUX, J., LEPAGE, O. M. and DOUCET, M. (2008), Comparative pharmacokinetics of two intravenous administration regimens of tiludronate in healthy adult horses and effects on the bone resorption marker CTX-1. Journal of Veterinary Pharmacology and Therapeutics, 31: 108–116. doi: 10.1111/j.1365-2885.2007.00936
  7. Allen KA, Johns S, Hyman SS, Sislak MD, Davis S, Amory J. How to Diagnose and Treat Back Pain in the Horse. Proc. AAEP. Vol 56: 384-388
  8. Duesterdieck-Zellmer KF, Driscoll N, Ott JF. Concentration-dependent effects of tiludronate on equine articular cartilage explants incubated with and without interleukin-1β. American Journal of Veterinary Research. Oct 2012, Vol. 73, No. 10, Pages 1530-1539. doi: 10.2460/ajvr.73.10.1530
  9. U.S. Food and Drug Administration. "FDA Provides Equine Veterinarians with Important Information about TILDREN and OSPHOS for Navicular Syndrome in Horses". http://www.fda.gov/AnimalVeterinary/ResourcesforYou/ucm406581.htm. External link in |website= (help);
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