DOSAGE AND ADMINISTRATION

Note: Barbiturates and ketamine hydrochloride, being chemically incompatible because of precipitate formation, should not be injected from the same syringe.

If the ketamine hydrochloride dose is augmented with diazepam, the two drugs must be given separately.

Do not mix ketamine hydrochloride and diazepam in syringe or infusion flask.

For additional information on the use of diazepam, refer to the WARNINGS and Sections of the diazepam insert.

Preoperative Preparations: 1.

While vomiting has been reported following ketamine hydrochloride administration, some airway protection may be afforded because of active laryngeal-pharyngeal reflexes.

However, since aspiration may occur with ketamine hydrochloride and since protective reflexes may also be diminished by supplementary anesthetics and muscle relaxants, the possibility of aspiration must be considered.

Ketamine hydrochloride is recommended for use in the patient whose stomach is not empty when, in the judgment of the practitioner, the benefits of the drug outweigh the possible risks.

2.

Atropine, scopolamine, or another drying agent should be given at an appropriate interval prior to induction.

Onset and Duration: Because of rapid induction following the initial intravenous injection, the patient should be in a supported position during administration.

The onset of action of ketamine hydrochloride is rapid; an intravenous dose of 2 mg/kg (1 mg/lb) of body weight usually produces surgical anesthesia within 30 seconds after injection, with the anesthetic effect usually lasting five to ten minutes.

If a longer effect is desired, additional increments can be administered intravenously or intramuscularly to maintain anesthesia without producing significant cumulative effects.

Intramuscular doses, in a range of 9 to 13 mg/kg (4 to 6 mg/lb) usually produce surgical anesthesia within 3 to 4 minutes following injection, with the anesthetic effect usually lasting 12 to 25 minutes.

Dosage: As with other general anesthetic agents, the individual response to ketamine hydrochloride is somewhat varied depending on the dose, route of administration, and age of patient, so that dosage recommendation cannot be absolutely fixed.

The drug should be titrated against the patient’s requirements.

Induction: Intravenous Route : The initial dose of ketamine hydrochloride administered intravenously may range from 1 mg/kg to 4.5 mg/kg (0.5 to 2 mg/lb).

The average amount required to produce five to ten minutes of surgical anesthesia has been 2 mg/kg (1 mg/lb).

Alternatively, in adult patients an induction dose of 1 mg to 2 mg/kg intravenous ketamine at a rate of 0.5 mg/kg/min may be used for induction of anesthesia.

In addition, diazepam in 2 mg to 5 mg doses, administered in a separate syringe over 60 seconds, may be used.

In most cases, 15 mg of intravenous diazepam or less will suffice.

The incidence of psychological manifestations during emergence, particularly dream-like observations and emergence delirium, may be reduced by this induction dosage program.

Note: The 100 mg/mL concentration of ketamine hydrochloride should not be injected intravenously without proper dilution.

It is recommended the drug be diluted with an equal volume of either Sterile Water for injection, USP, Normal Saline, or 5% Dextrose in Water.

Rate of Administration : It is recommended that ketamine hydrochloride be administered slowly (over a period of 60 seconds).

More rapid administration may result in respiratory depression and enhanced pressor response.

Intramuscular Route : The initial dose of ketamine hydrochloride administered intramuscularly may range from 6.5 to 13 mg/kg (3 to 6 mg/lb).

A dose of 10 mg/kg (5 mg/lb) will usually produce 12 to 25 minutes of surgical anesthesia.

Maintenance of Anesthesia: The maintenance dose should be adjusted according to the patient’s anesthetic needs and whether an additional anesthetic agent is employed.

Increments of one-half to the full induction dose may be repeated as needed for maintenance of anesthesia.

However, it should be noted that purposeless and tonic-clonic movements of extremities may occur during the course of anesthesia.

These movements do not imply a light plane and are not indicative of the need for additional doses of the anesthetic.

It should be recognized that the larger the total dose of ketamine hydrochloride administered, the longer will be the time to complete recovery.

Adult patients induced with ketamine hydrochloride augmented with intravenous diazepam may be maintained on ketamine hydrochloride given by slow microdrip infusion technique at a dose of 0.1 to 0.5 mg/minute, augmented with diazepam 2 to 5 mg administered intravenously as needed.

In many cases 20 mg or less of intravenous diazepam total for combined induction and maintenance will suffice.

However, slightly more diazepam may be required depending on the nature and duration of the operation, physical status of the patient, and other factors.

The incidence of psychological manifestations during emergence, particularly dream-like observations and emergence delirium, may be reduced by this maintenance dosage program.

Dilution : 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 Sodium Chloride (0.9%) Injection, USP (Normal Saline) and mix well.

The resultant solution will contain 1 mg of ketamine per mL.

The fluid requirements of the patient and duration of anesthesia must be considered when selecting the appropriate dilution of ketamine hydrochloride injection.

If fluid restriction is required, ketamine hydrochloride injection can be added to a 250 mL infusion as described above to provide a ketamine hydrochloride concentration of 2 mg/mL.

Ketamine hydrochloride injection 10 mg/mL vials are not recommended for dilution.

Supplementary Agents: Ketamine hydrochloride is clinically compatible with the commonly used general and local anesthetic agents when an adequate respiratory exchange is maintained.

The regimen of a reduced dose of ketamine hydrochloride supplemented with diazepam can be used to produce balanced anesthesia by combination with other agents such as nitrous oxide and oxygen.