Published: 08/31/2026 | Author: Nikki Wisher

Cravings during and after rehab triggered by a familiar place, person or object are one of the hardest parts of early recovery from opioid addiction. A recent trial shows that low electric stimulation measurably changed how the brain responded to those cues. But it didn’t change what participants felt.

The study tested theta-frequency transcranial alternating current stimulation, or tACS, in 60 men with opioid use disorder who received care at a residential treatment center. Their average age was in the mid-30s. The work was led by Hamed Ekhtiari of the University of Texas Southwestern Medical Center with Martin P. Paulus of the Laureate Institute for Brain Research.

Trial Results

Thirty participants received a single session that lasted 20 minutes. The other folks received placebos. Those who undertook the scan had an fMRI scan eight minutes before and eight minutes after, followed by a screen-based task presenting drug cues and measuring reactivity to them.

Active stimulation reduced drug cue-induced reactivity in the striatum. This is a subcortical region involved in reward processing and heavily implicated in addiction.

Self-reported craving is where the result stops short. Across both groups, craving scores dropped after the session. The difference between the active and placebo groups wasn’t statistically significant. 

The Technique in Action

In tACS, a weak oscillating current of 2 milliamps passes through electrodes on the scalp. The researchers tuned the current to a specific brain wave frequency. This trial targeted the theta band, meaning slow oscillations between 4-8 hertz.

The team used a high-definition electrode setup. Two pairs focus stimulation on the right frontoparietal network more precisely than conventional electrical stimulation or transcranial magnetic stimulation allows.

The reasoning rests on earlier imaging work. Drug cues activate circuits overlapping with reward and emotion processing, including the striatum and amygdala. The brain’s executive control network regulates those deeper structures. Synchronizing activity in the frontoparietal network should strengthen that regulation.

Supplementing Existing Treatments

Transcranial magnetic stimulation is already a mainstream depression treatment and has FDA clearance for smoking cessation. Results for other addictions, including for opioids, have been mixed. The researchers approached tACS partly because it costs less and greater accessibility. The FDA approved the first at-home transcranial electrical stimulation device for depression in December 2025.

None of this is available as an opioid addiction treatment today. The team has built an optimized version of the protocol it hopes to test in a treatment setting. A single session in 60 men is a starting point, not a result that changes clinical practice.

Opioids and Overdose Risk

Let’s take a step back and look at the bigger picture. Opioids include prescription medications such as oxycodone, hydrocodone and morphine along with heroin and synthetic opioids like fentanyl. They slow breathing, which makes overdose lethal. 

Overdose risk climbs sharply after any break in use, including after detox, hospitalization or release from jail. That’s because tolerance falls faster than most people expect.

Harm Reduction and Treatment Exist Now

While research on brain stimulation continues, the interventions with the strongest evidence for opioid use disorder are already available. Methadone, buprenorphine, and naltrexone all have substantial evidence behind them and can be combined with counseling and peer support.

• Carry naloxone. It’s available without a prescription at pharmacies in every state, and many health departments distribute it free. Naloxone reverses an overdose by displacing opioids from receptors within minutes. Call 911 even after giving it because naloxone wears off before the opioid does.
• Use fentanyl test strips if you or anyone uses drugs. Many harm reduction programs provide them for free.
• Don’t use drugs alone. If you must, call a never-use-alone hotline.

Begin Opioid Addiction Care Today

Peer support works alongside medication rather than against it. Narcotics Anonymous meetings are free and available online as well as in person. 

Browse our directory filtered by state and city to find meetings by day, format and type.

You can also feel free to call 800-934-1582(Sponsored) for free and confidential information, 24 hours a day.