This article is a safety piece. If you’re using kratom and fentanyl together, or suspect the kratom supply you’re using may be contaminated with fentanyl, read to the end — and then call us.
What the Tennessee Data Actually Shows
The Tennessee Department of Health’s February 2026 kratom surveillance brief, which draws on State Unexplained Death (SUDORS) toxicology from 2019–2024, shows a consistent pattern across six years of data:
- Fentanyl was detected in 66% of kratom-involved fatal overdoses in 2019.
- By 2021, that number peaked at 87%.
- In 2024 it was 69% — still the dominant co-substance.
Across the same period, kratom-only fatal overdoses were rare: only 1–7 cases per year statewide. The clinical takeaway is stark. When a kratom-involved death happens in Tennessee, it’s almost always because fentanyl was also in the picture.
Other co-substances appeared at lower rates: methamphetamine (19–29%), prescription opioids (13–32%), alcohol (20–27%), benzodiazepines (5–42%), cocaine (rising 5% → 20%). But fentanyl was the dominant one every year.
Why the Combination Is Pharmacologically Deadlier
Both kratom and fentanyl activate the mu-opioid receptor — kratom through mitragynine and 7-hydroxymitragynine, fentanyl through its own high-potency opioid mechanism. Together, they produce additive receptor activation. The practical consequence at the body level is amplified respiratory depression, the mechanism by which opioid overdoses kill.
Three features make the combination particularly dangerous:
- Fentanyl’s potency is extreme. Fentanyl is roughly 50–100 times stronger than morphine; illicit street fentanyl doses are hard to measure visually or by tolerance. Someone calibrating their kratom dose to their kratom tolerance has no way to account for fentanyl’s much steeper effect curve.
- Tolerance to opioids is additive but not perfectly cross-linked. A kratom tolerance doesn’t fully protect against fentanyl, especially if kratom has been the primary opioid-type substance recently. Relapse-overdose deaths often happen in exactly this window.
- Effect timing is different. Kratom effects peak over 30–90 minutes; fentanyl effects peak within minutes. Stacking doses in ways that feel deliberate can land both at peak simultaneously — an unpredictable respiratory depression curve.
The Contamination Problem
A separate risk is unintentional fentanyl exposure. The illicit drug supply in Tennessee and nationally has fentanyl contaminating substances well beyond the classic opioid categories:
- Counterfeit prescription pills (fake Percocet, fake Xanax, fake Adderall)
- Cocaine, methamphetamine, and other stimulants
- Less commonly but documented: some illicit kratom or 7-OH products, particularly from unlicensed online sources
Legitimate retail kratom products from U.S. distributors are not a common source of fentanyl contamination, but illicit or questionable-source products have no testing requirements and have been cited in case reports. The Tennessee data showing fentanyl in 66–87% of kratom-involved deaths likely reflects co-use (the user was using both intentionally) more than contamination, but contamination cases exist.
What Naloxone Does (and Doesn’t) Do
Naloxone (Narcan) is a pure opioid-receptor antagonist — it reverses opioid-type overdose by displacing opioid molecules from the mu receptor. Because both kratom’s alkaloids and fentanyl work at the mu receptor, naloxone can reverse respiratory depression from either substance or the combination. Every household with kratom or fentanyl use should have naloxone, and everyone who might witness an overdose should know how to use it.
Important caveats:
- Fentanyl’s potency often requires multiple doses of naloxone to reverse. One nasal spray may not be enough.
- Naloxone is short-acting. Someone reversed by naloxone can re-depress as the naloxone wears off if fentanyl is still in the body. Call 911 every time, even if the person wakes up.
- Naloxone works for opioid-type overdose, not for overdose driven by benzodiazepines, alcohol, or stimulants alone. In a mixed overdose, naloxone addresses the opioid component.
Tennessee pharmacies dispense naloxone over the counter without a prescription. Ask at the counter. Cost is typically minimal or zero with most insurance.
How MAT Handles Both at Once
Buprenorphine, the medication in Suboxone, Sublocade, and Brixadi, is a partial agonist at the mu-opioid receptor — the same receptor that kratom and fentanyl activate. When you start MAT, the medication occupies those receptors steadily, which has two effects on polysubstance use:
- Cravings for both kratom and fentanyl quiet at the same time. One medication, one treatment, because the underlying receptor system is the same.
- Continued opioid use on top of a stable Suboxone dose produces less effect. Buprenorphine’s tight receptor binding competes with incoming fentanyl, so overdose risk from a slip is typically reduced. This is not a guarantee against overdose — enough fentanyl can still overcome buprenorphine — but it’s a protective effect in day-to-day terms.
For a patient using both kratom and fentanyl, MAT intake looks essentially the same as for single-substance use: intake, DSM-5 assessment, COWS scoring (likely based on fentanyl timing because it’s the faster-clearing of the two in relative terms for these patients), counselor conversation, medical evaluation. If the COWS score supports induction, you leave with a prescription the same day.
Because fentanyl lingers in fat tissue longer than most opioids, your provider may recommend a longer wait between last fentanyl use and first buprenorphine dose — sometimes 24+ hours — to reduce precipitated withdrawal risk. For details, see our article on Suboxone induction timing; the same principles apply to fentanyl patients.
If You’re Currently Using Both
A few immediate actions regardless of whether you’re ready for treatment:
- Get naloxone today. Tennessee pharmacies stock it over the counter. Tell someone in your household where it is.
- Never use alone. If you have to, use a service like the Never Use Alone hotline (1-800-484-3731) or a safer-use app. Someone on a call who can summon help if you stop responding is the difference between a reversal and a death.
- Test strips. Fentanyl test strips can detect fentanyl in non-opioid substances if you’re concerned about contamination. They don’t tell you the quantity.
- Call us. You don’t have to stop using before you call. We’ve seen hundreds of patients in this exact situation. Same-week appointments are available.