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Nuromax Dosage

Generic name: doxacurium chloride
Dosage form: injection
Drug class: Neuromuscular blocking agents

Medically reviewed by Last updated on May 1, 2023.


NUROMAX, like other long-acting neuromuscular blocking agents, displays variability in the duration of its effect. The potential for a prolonged clinical duration of neuromuscular block must be considered when NUROMAX is selected for administration. The dosage information provided below is intended as a guide only. Doses should be individualized (see CLINICAL PHARMACOLOGY -Individualization of Dosages). Factors that may warrant dosage adjustment include: advancing age, the presence of kidney or liver disease, or obesity (patients weighing ≥ 30% more than ideal body weight for height). The use of a peripheral nerve stimulator will permit the most advantageous use of NUROMAX, minimize the possibility of overdosage or underdosage, and assist in the evaluation of recovery.

Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration whenever solution and container permit.


Initial Doses

When administered as a component of a thiopental/narcotic induction-intubation paradigm as well as for production of long-duration neuromuscular block during surgery, 0.05 mg/kg (2 × ED95) NUROMAX produces good-to-excellent conditions for tracheal intubation in 5 minutes in approximately 90% of patients. Lower doses of NUROMAX may result in a longer time for development of satisfactory intubation conditions. Clinically effective neuromuscular block may be expected to last approximately 100 minutes on average (range: 39 to 232) following 0.05 mg/kg NUROMAX administered to patients receiving balanced anesthesia.

An initial NUROMAX dose of 0.08 mg/kg (3 × ED95) should be reserved for instances in which a need for very prolonged neuromuscular block is anticipated. In approximately 90% of patients, good-to-excellent intubation conditions may be expected in 4 minutes after this dose; however, clinically effective block may be expected to persist for as long as 160 minutes or more (range: 110 to 338) (see CLINICAL PHARMACOLOGY).

If NUROMAX is administered during steady-state isoflurane, enflurane, or halothane anesthesia, reduction of the dose of NUROMAX by one third should be considered.

When succinylcholine is administered to facilitate tracheal intubation in patients receiving balanced anesthesia, an initial dose of 0.025 mg/kg (ED95) NUROMAX provides about 60 minutes (range: 9 to 145) of clinically effective neuromuscular block for surgery. For a longer duration of action, a larger initial dose may be administered.

Maintenance Doses

Maintenance dosing will generally be required about 60 minutes after an initial dose of 0.025 mg/kg NUROMAX or 100 minutes after an initial dose of 0.05 mg/kg NUROMAX during balanced anesthesia. Repeated maintenance doses administered at 25% T1 recovery may be expected to be required at relatively regular intervals in each patient. The interval may vary considerably between patients. Maintenance doses of 0.005 and 0.01 mg/kg NUROMAX each provide an average 30 minutes (range: 9 to 57) and 45 minutes (range: 14 to 108), respectively, of additional clinically effective neuromuscular block. For shorter or longer desired durations, smaller or larger maintenance doses may be administered.


When administered during halothane anesthesia, an initial dose of 0.03 mg/kg (ED95) produces maximum neuromuscular block in about 7 minutes (range: 5 to 11) and clinically effective block for an average of 30 minutes (range: 12 to 54). Under halothane anesthesia, 0.05 mg/kg produces maximum block in about 4 minutes (range: 2 to 10) and clinically effective block for 45 minutes (range: 30 to 80). Maintenance doses are generally required more frequently in children than in adults. Because of the potentiating effect of halothane seen in adults, a higher dose of NUROMAX may be required in children receiving balanced anesthesia than in children receiving halothane anesthesia to achieve a comparable onset and duration of neuromuscular block. NUROMAX has not been studied in pediatric patients below the age of 2 years.


Y-site Administration

NUROMAX Injection may not be compatible with alkaline solutions with a pH greater than 8.5 (e.g., barbiturate solutions).

NUROMAX is compatible with:

  • 5% Dextrose Injection, USP
  • 0.9% Sodium Chloride Injection, USP
  • 5% Dextrose and 0.9% Sodium Chloride Injection, USP
  • Lactated Ringer's Injection, USP
  • 5% Dextrose and Lactated Ringer's Injection
  • Sufenta® (sufentanil citrate) Injection, diluted as directed
  • Alfenta® (alfentanil hydrochloride) Injection, diluted as directed
  • Sublimaze® (fentanyl citrate) Injection, diluted as directed

Dilution Stability

NUROMAX diluted up to 1:10 in 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP has been shown to be physically and chemically stable when stored in polypropylene syringes at 5° to 25°C (41° to 77°F), for up to 24 hours. Since dilution diminishes the preservative effectiveness of benzyl alcohol, aseptic techniques should be used to prepare the diluted product. Immediate use of the diluted product is preferred, and any unused portion of diluted NUROMAX should be discarded after 8 hours.

Further information

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