August 3, 2015
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Ryanodex

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Ryanodex

RYANODEX®
(dantrolene sodium) for Injectable Suspension

DRUG DESCRIPTION

RYANODEX® (dantrolene sodium) for injectable suspension is a sterile lyophilized powder. RYANODEX is supplied in 20 mL vials containing 250 mg dantrolene sodium and the following inactive ingredients: 125 mg mannitol, 25 mg polysorbate 80, 4 mg povidone K12 and sufficient sodium hydroxide or hydrochloric acid for pH adjustment. When reconstituted with 5 mL sterile water for injection USP (without a bacteriostatic agent), this yields a suspension with a pH of approximately 10.3.

RYANODEX is a skeletal muscle relaxant. Chemically, RYANODEX is a hydrate of 1-[[[5-(4nitrophenyl)-2-furanyl]methylene]amino]-2,4-imidazolidinedione sodium salt. The structural formula for the hydrated salt is:

RYANODEX® (dantrolene sodium) Structural Formula Illustration

The hydrated salt contains approximately 15% water (3-½ moles) and has a molecular weight of 399. The anhydrous salt (dantrolene) has a molecular weight of 336.

Last reviewed on RxList: 8/4/2014
This monograph has been modified to include the generic and brand name in many instances.

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