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(betamethasone sodium phosphate and betamethasone acetate) Injectable Suspension USP 6 mg per mL
CELESTONE® SOLUSPAN®* Injectable Suspension is a sterile aqueous suspension containing 3 mg per milliliter betamethasone, as betamethasone sodium phosphate, and 3 mg per milliliter betamethasone acetate. Inactive ingredients per mL: 7.1 mg dibasic sodium phosphate; 3.4 mg monobasic sodium phosphate; 0.1 mg edetate disodium; and 0.2 mg benzalkonium chloride as preservative. The pH is adjusted to between 6.8 and 7.2.
The formula for betamethasone sodium phosphate is C22H28FNa2O8P and it has a molecular weight of 516.40. Chemically, it is 9-Fluoro-11β,17,21-trihydroxy-16βmethylpregna-1,4-diene-3,20-dione 21-(disodium phosphate).
The formula for betamethasone acetate is C24H31FO6 and it has a molecular weight of 434.50. Chemically, it is 9-Fluoro-11β,17,21-trihydroxy-16β-methylpregna-1,4-diene3,20-dione 21-acetate.
The chemical structures for betamethasone sodium phosphate and betamethasone acetate are as follows:
Betamethasone sodium phosphate is a white to practically white, odorless powder, and is hygroscopic. It is freely soluble in water and in methanol, but is practically insoluble in acetone and in chloroform.
Betamethasone acetate is a white to creamy white, odorless powder that sinters and resolidifies at about 165°C, and remelts at about 200°C-220°C with decomposition. It is practically insoluble in water, but freely soluble in acetone, and is soluble in alcohol and in chloroform.
*brand of rapid and repository injectable
Last reviewed on RxList: 7/21/2014
This monograph has been modified to include the generic and brand name in many instances.
Additional Celestone Soluspan Information
- Celestone Soluspan Drug Interactions Center: betamethasone acet & sod phos inj
- Celestone Soluspan Side Effects Center
- Celestone Soluspan FDA Approved Prescribing Information including Dosage
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