The global opioid crisis — widely documented in the United States, but also growing in Europe, Asia, and Latin America — places enormous pressure on dependence treatment programs. Methadone, a long-acting opioid agonist, is the cornerstone of maintenance treatment for opioid use disorder (OUD): it reduces craving, blocks the euphoria of illicit opioids, and decreases mortality. But pharmacologic dependence on methadone itself is a real limitation — reducing the dose over time requires careful management, and many patients find that transition clinically difficult. A multicenter randomized clinical trial published in Annals of Internal Medicine in August 2024 provides high-quality evidence that acupuncture can significantly facilitate this reduction: 62% of patients in the acupuncture group achieved a reduction of at least 20% in methadone dose at 8 weeks, versus only 29% in the sham group.
The study was led by Prof. Liming Lu of Guangzhou University of Chinese Medicine and conducted at 6 methadone maintenance clinics in China, with funding from the National Natural Science Foundation of China. The sponsors had no role in the design, analysis, or publication. Annals of Internal Medicine — with an impact factor among the highest in internal medicine — rarely publishes integrative medicine studies; the acceptance of this trial indicates that the methodologic quality and clinical relevance of the question exceeded the publishability threshold of this prestigious journal.
RCT RESULTS FOR ACUPUNCTURE FOR METHADONE REDUCTION (ANNALS INT MED, AUGUST 2024)
Study Design: Sham-Controlled in a Real Treatment Setting
The trial included adults with opioid use disorder (≤65 years) on methadone maintenance for at least 6 weeks — that is, patients already stabilized, not in acute withdrawal crisis. The 118 participants were randomized to real acupuncture (n=60) or sham acupuncture (n=58). The treatment protocol consisted of 3 weekly sessions for 8 weeks (24 total sessions). Participant blinding was systematically assessed: at study end, there was no detectable difference in responses about which treatment participants believed they had received — indicating that the sham was convincing as an active control.
The real acupuncture protocol used a fixed set of acupoints selected from the traditional Chinese medicine literature for opioid dependence. The limitation acknowledged by the authors is precisely this fixity: a standardized protocol does not allow the personalization that characterizes the clinical practice of medical acupuncture, where acupoints are adjusted to the patient’s pattern. Despite this, the results were statistically robust, suggesting that even without personalization the effect is real and clinically relevant.
Results: Dose and Craving Reduction
The primary outcome — proportion of patients who achieved ≥20% reduction in methadone dose at week 8 — was striking: 62% in the real acupuncture group versus 29% in the sham group (risk difference: 32%; P<0.001). This magnitude of difference is notable in a context where methadone maintenance programs frequently encounter patient resistance to any dose reduction. The reduction in opioid craving — measured by the 100 mm visual analog scale (VAS) — showed a difference of −11.7 mm favoring real acupuncture (P<0.001). Craving is one of the most robust predictors of relapse in OUD; its reduction has direct implications for the effectiveness of the treatment program.
The safety profile was favorable in both groups, with no serious adverse events recorded. Effective blinding — verified by the fact that participants could not reliably identify whether they received real or sham acupuncture — strengthens the internal validity of the trial, reducing expectancy bias as an alternative explanation for the results. The follow-up limitation of only 12 weeks after the end of acupuncture prevents conclusions about durability, but the 8-week data are sufficiently robust to support clinical discussion.
Frequently Asked Questions
The data from this trial are specific to methadone. However, the mechanisms by which acupuncture may act — modulation of endogenous opioid receptors (especially via release of beta-endorphin and enkephalins), reduction of sympathetic nervous system hyperactivity during withdrawal, and reduction of the craving sensation mediated by dopaminergic pathways — may also be relevant for other opioids (morphine, oxycodone, codeine, tramadol), although available clinical data have só far concentrated on methadone. Smaller studies and case series with other opioids report compatible results, but without high-quality trials comparable to this one. The medical acupuncturist will assess each case considering the specific opioid, the current dose, the speed of titration, and the clinical conditions of the patient.
Yes, and this is a context in which auricular acupuncture has long tradition — the NADA protocol (National Acupuncture Detoxification Association), with 5 auricular points (spirit, lung, liver, kidney, sympathetic nervous system), was developed specifically to support detoxification and is used in rehabilitation programs in several countries. The present trial used body acupuncture in an outpatient methadone maintenance setting, which is a different scenario from acute detoxification. In an inpatient context, the medical acupuncturist may adapt the protocol to the patient’s mobility capacity and the observed withdrawal profile.
This trial assessed the effect for up to 12 weeks after the end of the 8-week treatment. Durability data beyond that period were not collected. In clinical practice, acupuncture for craving and substance dependence is generally maintained with maintenance sessions (reduced frequency after the intensive phase) until the patient reaches sustained clinical stability. The decision about frequency and duration of the maintenance program is clinical, individualized, and should be made together with the physician responsible for treating the dependence.
Fonte Original
Annals of Internal Medicine(em inglês)Founded in 1989 by physicians trained at the University of São Paulo (USP) and specialized in China, CEIMEC is a Brazilian national reference in the teaching and practice of medical acupuncture. With more than 3,000 physicians trained over 35 years, it collaborates with HC-FMUSP and is recognized by the Brazilian Medical College of Acupuncture (CMBA/AMB).