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Ryanodex Dosage

Generic name: DANTROLENE SODIUM 250mg in 5mL
Dosage form: injection, suspension
Drug class: Skeletal muscle relaxants

Medically reviewed by Last updated on Aug 28, 2023.

Dosage for Treatment of Malignant Hyperthermia

In addition to RYANODEX treatment, institute the following supportive measures:

  • Discontinue use of malignant hyperthermia (MH)-triggering anesthetic agents (i.e., volatile anesthetic gases and succinylcholine).
  • Manage the metabolic acidosis
  • Institute cooling when necessary
  • Administer diuretics to prevent late kidney injury due to myoglobinuria (the amount of mannitol in RYANODEX is insufficient to maintain diuresis) [see Description (11)]

Administer RYANODEX by intravenous push at a minimum dose of 1 mg/kg. If the physiologic and metabolic abnormalities of MH continue, administer additional intravenous boluses up to the maximum cumulative dosage of 10 mg/kg.

If the physiologic and metabolic abnormalities reappear, repeat RYANODEX dosing by intravenous push starting with 1 mg/kg.

Dosage for Prevention of Malignant Hyperthermia

The recommended prophylactic dose of RYANODEX is 2.5 mg/kg administered intravenously over a period of at least 1 minute, starting approximately 75 minutes prior to surgery. Avoid agents that trigger MH.

If surgery is prolonged, administer additional individualized RYANODEX doses during anesthesia and surgery [see Clinical Pharmacology (12.3)].

Dosage for Pediatric Patients

The recommended weight-based dose of RYANODEX for pediatric patients in the treatment and prevention of MH is the same as for adults for these indications [see Dosage and Administration (2.1, 2.2)].

Reconstitution and Administration Instructions

The supplied lyophilized powder must be reconstituted prior to administration:

Reconstitute each vial of RYANODEX lyophilized powder by adding 5 mL of sterile water for injection (without a bacteriostatic agent). Do not reconstitute with any other solution (e.g., 5% dextrose injection, 0.9% sodium chloride injection).
Shake the vial to ensure an orange-colored uniform suspension. Visually inspect the vial for particulate matter and discoloration prior to administration.
Must use the contents of the vial within 6 hours after reconstitution. Store reconstituted suspensions at controlled room temperature (68°F to 77°F or 20°C to 25°C).

Do not dilute or transfer the reconstituted RYANODEX suspension to another container to infuse the product.

Administer the reconstituted RYANODEX suspension either:

  • Into the intravenous catheter while an intravenous infusion of 0.9% sodium chloride injection, or 5% dextrose injection is freely running; or
  • Into the indwelling catheter - after assuring its patency - without a freely running infusion. Flush the line to assure that there is no residual RYANODEX remaining in the catheter [see Warnings and Precautions (5.3)].

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.