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S-ketamine, also known as esketamine, is the S (+) enantiomer of ketamine. It is primarily used as an anesthetic and has gained attention for its use as an antidepressant, particularly for treatment-resistant depression (TRD). In 2019, the FDA approved esketamine as a treatment for TRD, making it the first form of ketamine to receive such approval. Additionally, S-ketamine is utilized in pain management, where it helps reduce the irritability of the pain system and improves the quality of life for patients with chronic pain

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Esketamine may prove to be a promising treatment for patients diagnosed with major depressive disorder who have not experienced an improvement in symptoms despite treatment with various medications and therapies. The intranasal route of administration for this drug allows for easy administration and a fast onset of action, which sets it apart from many other antidepressant agents that may take several weeks to take effect.

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General effects

Esketamine is considered a central nervous system (CNS) depressant agent. It may cause sedation, dizziness, and lethargy, among other symptoms. This drug has dissociative and antidepressant properties.⁶ Acutely, esketamine may impair attention, judgment, thinking, reaction speed, and motor skills. Two placebo-controlled studies were performed to evaluate the effects of ketamine on the ability to drive. The effects of esketamine 84 mg were comparable to placebo at 6 hours and 18 hours post-ingestion.

Effects on cardiac electrophysiology

The effect of esketamine (84 mg nasal spray and 0.8 mg/kg esketamine intravenously infused over 40 minutes) on the QTc interval was studied in a randomized, double-blind, placebo-, and positive-controlled (moxifloxacin 400 mg), 4-period, crossover study in 60 healthy volunteers. A marked increase in heart rate (higher than 10 bpm) was measured in subjects receiving intranasal and intravenous esketamine. Summative evidence from both nonclinical and clinical data suggests a lack of clinically relevant QTc prolongation at the normal therapeutic dose of esketamine.

Effects on blood pressure

Eskestamine causes increases in systolic and/or diastolic blood pressure at all therapeutic doses. Peak blood pressure elevation after esketamine administration occurs about 40 minutes after administration and lasts approximately 4 hours.⁶

Cognitive effects

In a study of healthy volunteers, one dose of this agent caused decline in cognitive performance 40 minutes after administration. Compared to subjects ingesting a placebo, esketamine-treated subjects required a higher level of effort to complete assigned cognitive tests at 40 minutes after administration. Cognitive performance and mental effort were found to be similar between esketamine and placebo at 2 hours after administration.⁶

Reports of long-term memory or cognitive impairment have been made following repeated ketamine misuse or abuse. No adverse effects of esketamine nasal spray on cognitive function were seen in a one-year open-label safety study. The long-term cognitive effects of esketamine have not been studied for more than a 1 year period, therefore, the risk of cognitive decline with long-term use is not yet confirmed