Ketamine Hydrochloride

KETAMINE HYDROCHLORIDE- ketamine hydrochloride injection, solution, concentrate
Hospira, Inc.

1 INDICATIONS AND USAGE

Ketamine Hydrochloride Injection is indicated:

  • as the sole anesthetic agent for diagnostic and surgical procedures that do not require skeletal muscle relaxation.
  • for the induction of anesthesia prior to the administration of other general anesthetic agents.
  • as a supplement to other anesthetic agents.

2 DOSAGE AND ADMINISTRATION

2.1 Important Dosage and Administration Information

Ketamine Hydrochloride Injection should be administered by or under the direction of physicians experienced in the administration of general anesthetics, maintenance of a patent airway, and oxygenation and ventilation. Continuously monitor vital signs in patients receiving Ketamine Hydrochloride Injection.

Emergency airway equipment must be immediately available.

Do not administer the 100 mg/mL concentration of Ketamine Hydrochloride Injection intravenously without proper dilution [see Dosage and Administration (2.3)]. Must be used immediately after dilution.

While some degree of airway protection may be afforded due to active laryngeal-pharyngeal reflexes, vomiting and aspiration may occur with ketamine. Ketamine Hydrochloride Injection is not recommended for use in patients who have not followed nil per os guidelines.

Due to the potential for salivation during Ketamine Hydrochloride Injection administration, administer an antisialagogue prior to induction of anesthesia.

In individuals with a history of chronic ketamine use for off-label indications, there have been case reports of genitourinary pain that may be related to the ketamine treatment, not the underlying condition [see Adverse Reactions (6)]. Consider cessation of ketamine if genitourinary pain continues in the setting of other genitourinary symptoms.

2.2 Recommended Dosage and Administration

The Ketamine Hydrochloride Injection dosage must be individualized and titrated to the desired clinical effect.

If a longer duration of effect is desired, additional increments can be administered intravenously or intramuscularly to maintain anesthesia. However, a higher total dose will result in a longer time to complete recovery.

Induction of Anesthesia

Intravenous Route: The initial dose of Ketamine Hydrochloride Injection administered intravenously may range from 1 mg/kg to 4.5 mg/kg. The average amount required to produce 5 to 10 minutes of surgical anesthesia within 30 seconds following injection is 2 mg/kg. Administer Ketamine Hydrochloride Injection slowly (i.e., over a period of 60 seconds). Rapid administration may result in respiratory depression and enhanced vasopressor response. The induction dose may be administered as an intravenous infusion at a rate of 0.5 mg/kg/min.

Intramuscular Route: The initial dose of Ketamine Hydrochloride Injection administered intramuscularly may range from 6.5 to 13 mg/kg. A dose of 9 to 13 mg/kg usually produces surgical anesthesia within 3 to 4 minutes following injection, with the anesthetic effect usually lasting 12 to 25 minutes. Administer a benzodiazepine, if clinically indicated, for the prevention of neuropsychological manifestations during emergence from anesthesia.

Maintenance of Anesthesia

Adjust the maintenance dose according to the patient’s anesthetic needs and whether an additional anesthetic agent is administered.

Repeat increments of one-half to the full induction dose as needed for maintenance of anesthesia. Purposeless and tonic-clonic movements of extremities may occur during the course of ketamine anesthesia. These movements do not imply a light plane and are not indicative of the need for additional doses of the anesthetic.

Ketamine Hydrochloride Injection given by slow microdrip infusion technique at a dose of 0.1 to 0.5 mg/minute will maintain general anesthesia in adult patients induced with ketamine. Augment Ketamine Hydrochloride Injection with an intravenous benzodiazepine for the prevention of neuropsychological manifestations during emergence.

Supplement to Other Anesthetic Agents

Ketamine Hydrochloride Injection can be administered to supplement other general and local anesthetic agents. Continuously monitor patients for changes in respiratory and hemodynamic parameters.

A reduced dose of Ketamine Hydrochloride Injection can be used to produce balanced anesthesia when used in combination with other anesthetic agents.

2.3 Preparation of Dilution

Ketamine Hydrochloride Injection is a clear, colorless sterile solution. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Discard if product is discolored or contains particulate matter.

Induction of Anesthesia: Do not intravenously inject the 100 mg/mL concentration of Ketamine Hydrochloride Injection without proper dilution. Dilute Ketamine Hydrochloride Injection with an equal volume of either Sterile Water for injection, USP, 0.9% Sodium Chloride Injection, USP (Normal Saline), or 5% Dextrose in Water. Use immediately after dilution.

Maintenance of Anesthesia: To prepare a dilute solution containing 1 mg of ketamine per mL, aseptically transfer 10 mL from a 50 mg per mL vial or 5 mL from a 100 mg per mL vial to 500 mL of 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP (Normal Saline) and mix well. The resultant solution will contain 1 mg of ketamine per mL. Use immediately after dilution.

When fluid restriction is required, Ketamine Hydrochloride Injection can be added to a 250 mL infusion as described above to provide a Ketamine Hydrochloride Injection concentration of 2 mg/mL.

3 DOSAGE FORMS AND STRENGTHS

Ketamine Hydrochloride Injection, USP is a clear, colorless, sterile solution available in multiple-dose vials containing 100 mg ketamine base/mL (equivalent to 115.3 mg ketamine hydrochloride).

  • 500 mg/5 mL (100 mg/mL)

4 CONTRAINDICATIONS

  • Ketamine Hydrochloride Injection is contraindicated in patients for whom a significant elevation of blood pressure would constitute a serious hazard [see Warnings and Precautions (5.1)].
  • Ketamine Hydrochloride Injection is contraindicated in patients with known hypersensitivity to ketamine or to any excipient [see Adverse Reactions (6)].

5 WARNINGS AND PRECAUTIONS

5.1 Hemodynamic Instability

Transient increases in blood pressure, heart rate, and cardiac index are frequently observed following administration of Ketamine Hydrochloride Injection. Decreases in blood pressure and heart rate, arrhythmias, and cardiac decompensation have also been observed. Monitor vital signs and cardiac function during Ketamine Hydrochloride Injection administration. Ketamine Hydrochloride Injection is contraindicated in patients for whom a significant elevation of blood pressure would constitute a serious hazard [see Contraindications (4)] .

5.2 Emergence Reactions

Emergence delirium (postoperative confusional states or agitation) has occurred in approximately 12% of patients during the recovery period, and the duration is generally a few hours. The neuropsychological manifestations vary in severity between pleasant dream-like states, vivid imagery, hallucinations, and emergence delirium. In some cases, these states have been accompanied by confusion, excitement, and irrational behavior, which have been recalled as unpleasant experiences. No residual psychological effects are known to have resulted from use of Ketamine Hydrochloride Injection during induction and maintenance of anesthesia.

Intramuscular administration results in a lower incidence of emergence reactions.

The incidence of psychological manifestations during emergence, particularly dream-like observations and emergence delirium, may be reduced by using lower recommended dosages of Ketamine Hydrochloride Injection in conjunction with an intravenous benzodiazepine during induction and maintenance of anesthesia [see Dosage and Administration (2.3)]. Also, these reactions may be reduced if verbal, tactile, and visual stimulation of the patient is minimized during the recovery period. This does not preclude the monitoring of vital signs.

5.3 Respiratory Depression

Respiratory depression may occur with overdosage or a rapid rate of administration of Ketamine Hydrochloride Injection. Maintain adequate oxygenation and ventilation.

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