What the science says about ketamine for sustained opioid cessation and rapid detoxification?
There could be more recent work published (for example, the clinical trials led by Elias Dakwar), but in the systematic review by Jones et al. (2018), the authors highlight studies that looked into the use of ketamine in the treatment of opioid use disorder (OUD) and as an adjunct to opioid detoxification. A more recent systematic review and meta-analysis was published by Walsh et al. (2022), but referred to the same studies as Jones et al. (2018).
In Krupitsky et al. (2002), the authors conducted a randomized controlled trial of 70 heroin-dependent participants in which they compared the efficacy of higher dose ketamine (2 mg/kg) vs. lower dose ketamine (0.2 mg/kg), both administered intramuscularly (IM) in conjunction with psychotherapy. They found abstinent rates at 1, 3, 6, 12, 18, and 24 months to be notably greater in the higher dose group compared with the lower dose group. In a follow-up study, Krupitsy et al. (2007) measured abstinence rates. The authors evaluated the efficacy of single vs. repeated sessions of ketamine-assisted psychotherapy in increasing abstinence from heroin. The randomized participants to either 1 or 3 sessions (2mg/kg IM given at 1 month intervals). The authors found 50% of participants from the multiple sessions group were abstinent at the 1 year follow-up compared to a notably reduced number in the single treatment group.
To investigate ketamine’s potential to assist with opioid detoxification, Jovaisa et al. (2006) conducted a randomized controlled trial in which participants were given either saline placebo infusion or 0.5 mg/kg/h of IV ketamine prior to rapid opiate antagonist induction under general anesthesia. The authors found that ketamine could suppress the physiologic response to opioid withdrawal. However, this was unrelated to treatment outcome at 4-month follow-up.
Malchow et al. (2020) considered ketamine's anti-hyperalgesic properties, and conducted a study that sought to establish a novel ketamine assisted opioid detoxification program aimed at safely decreasing both opioid use while simultaneously addressing chronic pain. Their study included 41 veterans with chronic noncancer pain and on chronic opioids who received ketamine assisted opioid detoxification. The study found new evidence that the utilization of a standardized ketamine infusion protocol coupled with a rapid opioid detoxification is very effective, results in a high rate of prolonged opioid reduction, decreases chronic pain, minimizes opioid withdrawal using strictly non-opioid analgesics, and decreases depressive symptoms.