Ketamine

Generic name: Ketamine
Brand names: Ketalar
Dosage form: Injection 200 mg/20 mL (10 mg/mL), 500 mg/10 mL (50 mg/mL), and 500 mg/5 mL (100 mg/mL)
Drug class: General anesthetics

Usage of Ketamine

Ketamine is a dissociative anesthetic used in medical procedures to put you to sleep for surgery, and to prevent pain and discomfort. Ketamine for depression and anxiety is currently being researched, using lower doses. Ketamine is also a drug of abuse that is used illegally recreationally for its hallucinogenic properties and is known to be a “date rape” drug as it causes short-term memory loss.

When used for anesthesia, ketamine is given as an intravenous injection (IV) or as an intramuscular injection (IM). Ketamine is an NMDA receptor antagonist.

Esketamine (Spravato), one of the forms of racemic ketamine, was approved in 2019 for specific types of depression. Spravato is a nasal spray that is used under strict medical supervision and is not used by patients at home.

Ketamine became an FDA-approved medicine on February 19, 1970, as a general anesthetic to be used as the sole anesthetic agent for diagnostic and surgical procedures that do not require skeletal muscle relaxation. It is also used for the induction of anesthesia prior to the administration of other general anesthetic agents and as a supplement to other anesthetic agents.

Ketamine side effects

Common ketamine side effects, when used medically, include confusion or a dream-like feeling.

Serious ketamine side effects, when used medically, include:

Allergic reactions - get emergency medical help if you have signs of an allergic reaction, including hives, difficulty breathing, and swelling of your face, lips, tongue, or throat.

Tell your caregivers if you have hallucinations or unusual thoughts while waking up from anesthesia.

Call your doctor at once if you have:

painful or difficult urination, increased urination, loss of bladder control, blood in your urine;

a light-headed feeling, like you might pass out;

slow heart rate, weak or shallow breathing; or

jerky muscle movements that may look like convulsions.

This is not a complete list of side effects, and others may occur. Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

Before taking Ketamine

Ketamine should not be used in patients for whom a significant elevation of blood pressure would constitute a serious hazard or in patients with known hypersensitivity to ketamine or to any excipient.

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How to use Ketamine

Usual Adult Ketamine Dose for Anesthesia:

Intravenous injection (IV)Induction: 1 to 4.5 mg/kg IV; alternatively, 1 to 2 mg/kg IV at a rate of 0.5 mg/kg/min; (2 mg/kg dose provides 5 to 10 minutes of surgical anesthesia within 30 seconds) Maintenance: The maintenance dose should be adjusted according to the patient's anesthetic needs and whether an additional anesthetic is employed. Increments of one-half to the full induction dose may be repeated as needed for maintenance of anesthesia. Intramuscular injection (IM) Induction: 6.5 to 13 mg/kg IM; (9 to 13 mg/kg IM provides 12 to 25 minutes of surgical anesthesia) Maintenance: The maintenance dose should be adjusted according to the patient's anesthetic needs and whether an additional anesthetic is employed. Increments of one-half to the full induction dose may be repeated as needed for maintenance of anesthesia. Comments: This drug should be administered slowly over a period of 60 seconds (more rapid administration may result in respiratory depression and enhanced pressor response). The larger the total dose, the longer the complete recovery will be. Because of rapid induction following the initial IV injection, the patient should be in a supported position during administration.

Usual Pediatric Ketamine Dose for Anesthesia:

16 years and older: See adult dosing

Warnings

Emergence reactions Tell your caregivers if you have hallucinations or unusual thoughts while waking up from anesthesia.

Hemodynamic instability Temporary increases in blood pressure, heart rate, and cardiac index may be observed during administration. Vital signs and cardiac function should be monitored during administration.

Risk of respiratory depression may occur with overdosage or too rapid a rate of administration. Maintain adequate oxygenation and ventilation

Risks of using ketamine alone for procedures of the pharynx, larynx, or bronchial tree Pharyngeal and laryngeal reflexes are not suppressed with ketamine when it is used alone. Avoid use as a sole anesthetic agent in surgery or diagnostic procedures of the pharynx, larynx, or bronchial tree. Muscle relaxants may be required.

Pediatric neurotoxicity Studies conducted in young animals and children suggest repeated or prolonged use of general anesthetic or sedation drugs in children younger than 3 years may have negative effects on their developing brains. Discuss with parents and caregivers the benefits, risks, timing, and duration of surgery or procedures requiring anesthetic and sedation drugs.

Drug-induced liver injury is associated with the administration of this medicine.

Increase in cerebrospinal fluid pressure An increase in intracranial pressure has been reported following the administration of this medicine. Patients with elevated intracranial pressure should be in a monitored setting with frequent neurologic assessments.

What other drugs will affect Ketamine

It may take you longer to recover from anesthesia if you use other drugs that make you sleepy or slow your breathing. This includes opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.

Other drugs may affect ketamine, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all other medicines you use.

Tell your doctor if you take theophylline, aminophylline, sympathomimetic medications, vasopressin, benzodiazepines, opioid analgesics, or other CNS depressants.

Not all possible interactions are listed here.

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