Etidronic acid

Etidronic acid, also known as etidronate, is a bisphosphonate used as a medication, detergent, water treatment, and cosmetic.

Etidronic acid
Clinical data
Trade namesDidronel, others
Other names1-Hydroxyethane 1,1-diphosphonic acid; HEDP
AHFS/Drugs.comInternational Drug Names
License data
Pregnancy
category
  • US: C (Risk not ruled out)
    Routes of
    administration    		Oral, intravenous
    ATC code
    Legal status
    Legal status
    • In general: ℞ (Prescription only)
    Pharmacokinetic data
    Bioavailability3%
    MetabolismNil
    Elimination half-life1 to 6 hours
    ExcretionRenal and fecal
    Identifiers
    CAS Number
    PubChem CID
    IUPHAR/BPS
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEBI
    ChEMBL
    CompTox Dashboard (EPA)
    ECHA InfoCard100.018.684
    Chemical and physical data
    FormulaC2H8O7P2
    Molar mass206.027 g·mol−1
    3D model (JSmol)
      (verify)

    It was patented in 1966 and approved for medical use in 1977.[1]

    Use

    Medical

    Etidronic acid is a bisphosphonate used to strengthen bone, treat osteoporosis, and treat Paget's disease of bone.

    Bisphosphonates primarily reduce osteoclastic activity, which prevents bone resorption, and thus moves the bone resorption/formation equilibrium toward the formation side and hence makes bone stronger on the long run. Etidronate, unlike other bisphosphonates, also prevents bone calcification. For this reason, other bisphosphonates, such as alendronate, are preferred when fighting osteoporosis. To prevent bone resorption without affecting too much bone calcification, etidronate must be administered only for a short time once in a while, for example for two weeks every 3 months. When given on a continuous basis, say every day, etidronate will altogether prevent bone calcification. This effect may be useful and etidronate is in fact used this way to fight heterotopic ossification. But in the long run, if used on a continuous basis, it will cause osteomalacia.

    Chemical
    Main article: Corrosion inhibitor

    HEDP is used as a retardant in concrete, scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent. The dosage of 1–10 mg/L is preferred as scale inhibitor, 10–50 mg/L as corrosion inhibitor, and 1000–2000 mg/L as detergent. Usually, HEDP is also used together with polycarboxylic acid (superplasticizer), in which it acts as reducing agent.

    Chelating agent and antioxidant

    Etidronic acid is a chelating agent and may be added to bind or, to some extent, counter the effects of substances, such as calcium, iron or other metal ions, which may be discharged as a component of grey wastewater and could conceivably contaminate groundwater supplies. As a phosphonate it has corrosion inhibiting properties on unalloyed steel. Etidronic acid also acts to retard rancidification and oxidation of fatty acids.

    HEDP and its salts are added to detergents and other cleaning agents to prevent the effects of hard water. It is also used in peroxide bleaching to prevent degradation of peroxides by transition metals.

    Etidronic acid is listed as an ingredient of several cosmetic formulations where it is used for suppressing radical formation, emulsion stabiliser and viscosity control. While etidronic acid has not been limited from inclusion in cosmetics and does have legitimate uses, it is recommended that, as with most cosmetic products (particularly soaps), the product should be thoroughly rinsed from the skin after use.

    Etidronic acid is also included among swimming pool chemicals. It is used as a stain inhibitor to prevent metal ions coming out of solution and staining the sides of swimming pools.

    Pharmacology
    Relative potency[2]
    Bisphosphonate Relative potency
    Etidronate 1
    Tiludronate 10
    Pamidronate 100
    Alendronate 100-500
    Ibandronate 500-1000
    Risedronate 1000
    Zoledronate 5000

    Synthesis

    Etidronic acid can be prepared by reaction of Phosphorus trichloride with acetic acid in a tertiary amine, or by reaction of an acetic acid/acetic anhydride mixture with phosphorous acid.[3]

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    References
    1. Fischer, Jnos; Ganellin, C. Robin (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 523. ISBN 9783527607495.
    2. D., Tripathi, K. (2013-09-30). Essentials of medical pharmacology (Seventh ed.). New Delhi. ISBN 9789350259375. OCLC 868299888.
    3. "Compound Summary for CID 3305". pubchem.ncbi.nlm.nih.gov. Use and manufacturing. Retrieved 3 February 2015.
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