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Oral ketamine significantly reduces depression scores with a 2.38 relative risk for remissionOral ketamine shows promise for treating several types of depression

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Key Takeaway
Consider oral ketamine for reducing depression scores and improving remission in unipolar, bipolar, and treatment-resistant cases.

This meta-analysis evaluated the efficacy of oral ketamine in patients with unipolar depression, bipolar depression, and treatment-resistant depression. The analysis included 414 participants to compare oral ketamine against placebo or other modes of ketamine administration.

The primary finding was a significant decrease in depression scores for those receiving oral ketamine compared to placebo (SMD of -0.62; 95% CI = -0.39, -0.85; p < 0.00001). Additionally, the remission outcome showed a significant difference favoring ketamine with a relative risk of 2.38 (95% CI = 1.19, 4.77; p = 0.01). When comparing oral ketamine to other forms of ketamine, no significant difference was observed in depression scores (MD of 0.28; 95% CI = -4.58, 5.14; p = 0.91).

The authors noted that while oral ketamine is well-tolerated and potentially effective for reducing depressive symptoms, further RCTs are required to establish optimal treatment duration parameters. The evidence for depression score reduction is of moderate certainty. Clinical application may be considered for patients with these conditions, though the specific duration of treatment remains undetermined.

How this fits prior evidence

This meta-analysis addresses a gap in understanding the efficacy of oral ketamine specifically for depressive disorders. While previous coverage noted that ketamine offers no pain advantage over opioids in prehospital trauma and was evaluated as an analgosedative in critically ill children, this study focuses on psychiatric outcomes. It confirms the potential of ketamine for managing depression symptoms, though it does not relate to the previously reported findings regarding canine/feline anesthesia or pediatric procedural sedation.

Living with depression can feel like a constant uphill battle, especially when standard treatments do not provide enough relief. New data suggests that oral ketamine might offer a helpful option for those struggling with unipolar, bipolar, or treatment-resistant depression.

Researchers looked at 414 patients to see how oral ketamine compared to placebos and other forms of the drug. The results showed that people taking oral ketamine had significantly lower depression scores than those taking a placebo. Additionally, patients taking oral ketamine were much more likely to reach remission, which means their symptoms improved enough to be considered in remission.

While the evidence shows that oral ketamine is well-tolerated and effective at lowering scores, there are still pieces of the puzzle missing. The study notes that while it works well compared to a placebo, it did not show a significant difference when compared to other forms of ketamine. More research is still needed to figure out the best length of time for treatment.

What this means for you:
Oral ketamine significantly reduces depression scores and improves remission rates for several types of depression.

Common questions

What types of depression can oral ketamine help?

The study included patients with three specific types of conditions: unipolar depression, bipolar depression, and treatment-resistant depression. For all three groups, the data showed that oral ketamine was effective at reducing depression scores compared to a placebo.

Is oral ketamine more effective than other forms of ketamine?

The study found no significant difference in depression scores when comparing oral ketamine to other forms of the drug. While it worked well against a placebo, it performed similarly to other ways of administering ketamine.

Is oral ketamine safe for patients?

The study reported that oral ketamine was well-tolerated by the participants. No serious adverse events were reported during the period of observation, suggesting it can be safely applied to treat depressive symptoms.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
BACKGROUND: Oral ketamine is a novel treatment for management of depression. However, evidence related to its effectiveness and safety is unavailable. This systematic review aimed to assess the short-term efficacy and safety of oral ketamine compared to placebo or other modes of ketamine in randomized controlled trials (RCT) in unipolar depression, bipolar depression, and treatment-resistant depression. METHODS: A comprehensive search was done for RCTs in multiple databases including PubMed, EMBASE, Scopus, Cochrane Central, Web of Science and ProQuest. The primary outcome was change in depression scores measured by validated scales. Meta-analysis was carried out using random-effects model. RESULTS: Eight studies (n = 414) were included. The depression scores showed a significant decrease after oral ketamine treatment versus placebo, with a SMD of - 0.62 [95% CI= -0.39, -0.85, Z = 5.24, p < 0.00001] with moderate certainty of the evidence. A significant difference in remission outcome favouring ketamine was observed with a pooled RR of 2.38 [95% CI= 1.19, 4.77, p = 0.01] with no heterogeneity [I = 0%, p = 0.49].Compared to other forms of ketamine, depression scores showed no significant difference between oral ketamine treatment versus other forms of ketamine, with a MD of 0.28 [95% CI= -4.58, 5.14, p = 0.91]. Oral ketamine was well-tolerated with no serious adverse events. CONCLUSION: The findings of our study suggest that oral ketamine can be safely applied and may be effective in reducing depressive symptoms in patients with depression. Further RCTs are needed to strengthen our results and identify the optimal treatment duration parameters.
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