Tetrasodium etidronate

Etidronic acid
Clinical data
Trade names	Didronel, others
Other names	1-Hydroxyethylidene-1,1-diphosphonic acid; HEDP
AHFS/Drugs.com	International Drug Names
License data	US FDA: Etidronate+disodium;
Routes of; administration	Oral, intravenous
ATC code	M05BA01 (WHO) M05BB01 (WHO);
Legal status
Legal status	In general: ℞ (Prescription only);
Pharmacokinetic data
Bioavailability	3%
Metabolism	Nil
Elimination half-life	1 to 6 hours
Excretion	Renal and fecal
Identifiers
	IUPAC name (1-Hydroxyethan-1,1-diyl)bis(phosphonic acid);
CAS Number	2809-21-4 ;
PubChem CID	3305;
IUPHAR/BPS	7184;
DrugBank	DB01077 ;
ChemSpider	3189 ;
UNII	M2F465ROXU;
KEGG	D02373 ;
ChEBI	CHEBI:4907 ;
ChEMBL	ChEMBL871 ;
CompTox Dashboard (EPA)	DTXSID6023028 ;
ECHA InfoCard	100.018.684
Chemical and physical data
Formula	C2H8O7P2
Molar mass	206.027 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=P(O)(O)C(O)(C)P(=O)(O)O;
	InChI InChI=1S/C2H8O7P2/c1-2(3,10(4,5)6)11(7,8)9/h3H,1H3,(H2,4,5,6)(H2,7,8,9) ; Key:DBVJJBKOTRCVKF-UHFFFAOYSA-N ;
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Etidronic acid, also known as etidronate, is a non-nitrogenous bisphosphonate used as a medication, detergent, water treatment, and cosmetic.

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

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