Mixing Benzodiazepines and Opioids
Mixing benzodiazepines and opioids is the deadliest combination in prescription medicine — two depressants that can quietly stop your breathing together. Here's why it happens, the naloxone catch, and the safe way off both.
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Why Mixing Benzos and Opioids Is So Dangerous
Benzodiazepines and opioids are both central nervous system depressants, and the danger of taking them together comes down to one organ system: your breathing. Each drug slows it on its own. Stacked, the effect is more than the sum of its parts, and breathing can slow to the point where it stops.
That is not a rare or theoretical risk. Concurrent use of opioids and benzodiazepines produces additive respiratory and central-nervous-system effects that put people at increased risk of fatal overdose, which is exactly why national prescribing guidance now warns against the combination[1]. If you take both — on purpose, by prescription, or because they showed up together in something off the street — this is worth understanding clearly.
The reassuring part: if you’re on both and it scares you, you don’t have to white-knuckle your way off. Both drugs have a safe, supervised path off, and that path is far gentler than the withdrawal most people are picturing.
Mixed an opioid and a benzo? Know the overdose signs. Call 911 — naloxone reverses the opioid, not the benzo.
Overdose signs to act on:
- Slow, shallow, or stopped breathing. Gurgling, gasping, or long pauses between breaths.
- Can’t be woken. No response to their name, to a shake, or to a hard knuckle-rub on the breastbone.
- Blue or gray lips and fingertips, pinpoint pupils, limp body.
What to do:
- Give naloxone (Narcan) if you have it, and call 911 anyway. Naloxone reverses the opioid, not the benzodiazepine — so even after it works, the benzo keeps depressing breathing and the person can slip back under. Stay with them. How naloxone works →
- Give rescue breaths and keep the airway open while you wait for help. If they’re breathing on their own, roll them onto their side.
- Never use alone. Most overdose deaths happen with no one there to call for help or give naloxone.
- Two drugs, one shared danger: opioids and benzodiazepines both depress the central nervous system, so taken together they cause additive respiratory depression and a higher risk of fatal overdose[1].
- The warning is official: the FDA’s strongest label warning — its boxed warning — cautions against using opioids and benzodiazepines together, and the CDC’s 2016 opioid guideline tells prescribers to avoid the combination when possible[2][3].
- Naloxone is not a full reset: it reverses the opioid but does nothing to the benzodiazepine, and the benzo’s effect outlasts the dose — so you give naloxone, call 911, and stay[4].
- The way out is real: opioid use disorder is treated effectively with medication like buprenorphine or methadone, and the benzodiazepine comes off through a slow, supervised taper — neither should be stopped abruptly[5][6].
How Two Depressants Shut Down Breathing
To see why the combination is so lethal, it helps to picture breathing as something your brainstem does automatically, without you thinking about it. Both of these drug classes lean on that automatic system — and they lean on it through two different mechanisms, which is the heart of the problem.
Opioids act on receptors in the brainstem that directly blunt the drive to breathe. At a high enough dose, the body simply stops registering the rising carbon dioxide that should be screaming at it to take the next breath. Benzodiazepines work a different way — they amplify GABA, the brain’s main calming signal, which deepens sedation and further softens the alarm that normally keeps breathing going.
Put them together and you’ve taken your foot off the gas (the opioid quiets the breathing drive) and pressed the brake (the benzo sedates everything further). The two effects don’t just add — they reinforce each other. A dose of an opioid that a person would have tolerated on its own can become fatal once a benzodiazepine is on board. That synergy is the entire reason these two classes are singled out as uniquely dangerous together.
The table below lays the two drug classes side by side. The point isn’t that one is worse — it’s that they hit breathing from two angles at once, and that the rescue drug only covers one of them.
| How they compare | Opioids | Benzodiazepines |
|---|---|---|
| Examples | Oxycodone, hydrocodone, fentanyl, heroin, methadone | Xanax (alprazolam), Klonopin (clonazepam), Ativan (lorazepam), Valium (diazepam) |
| How it slows breathing | Blunts the brainstem’s drive to breathe | Amplifies GABA, deepening sedation and softening the breathing alarm |
| Together | Additive, reinforcing respiratory depression and higher overdose risk[1] | Additive, reinforcing respiratory depression and higher overdose risk[1] |
| Reversed by naloxone | Yes | No[4] |
| Dangerous to stop abruptly | Large dose swings raise overdose risk[7] | Yes, abrupt withdrawal can be dangerous, so taper[6] |
The Sedation Hides the Warning Signs
There’s a second, quieter danger. Benzodiazepines blunt awareness and memory. Someone who has taken one may not notice they’re getting too sedated, may not remember how much they’ve already taken, and may redose. The drug that’s slowing the breathing is also erasing the judgment that would otherwise pump the brakes.
What the Overdose Data Shows
The pattern in the data is consistent and sobering: when opioids and benzodiazepines are used together, more people die.
Among patients receiving opioid agonist treatment for opioid use disorder, benzodiazepine co-dependence is common — and it has been linked to increased mortality in this group[8]. The combination’s risk is precisely why prescribers are urged to avoid pairing the two: policymakers have worked to discourage concurrent prescribing of opioids and benzodiazepines specifically because it is associated with overdose[9].
There’s a hard clinical wrinkle worth naming. Because benzodiazepine use is so common among people in opioid treatment, some prescribers have tried supervised benzodiazepine prescribing during treatment as a way to reduce the harms of unmonitored, street-sourced benzo use[8]. It’s a genuinely difficult tradeoff, and it’s a decision for a clinician who knows the whole case — not a reason for anyone to assume their own combination is therefore safe. The consistent signal underneath all of it is the same: benzodiazepines and opioids together raise the risk of death, which is why the goal is almost always to reduce or separate them under care, not to normalize the pairing.
It isn’t only a prescription story. A newer and harder-to-track danger comes from designer benzodiazepines — illegally produced, highly potent, cheap benzos sold on street markets and online — which are increasingly turning up in drug-related deaths[10]. Toxicology in some regions now routinely detects these designer benzos, such as etizolam, alongside opioids in fatal cases, part of a broader trend toward more substances involved in each death[11]. Someone who buys a counterfeit pill believing it’s a single drug may be taking an opioid and a potent benzo at once, with no way to know — which is also why test strips and never using alone matter so much.
Why So Many People End Up on Both
If the combination is this dangerous, why is it so common? Usually not recklessness — it’s the way two extremely common conditions overlap.
Chronic pain and anxiety travel together. A person on a long-term opioid for back pain who also has panic attacks is a natural candidate to be prescribed a benzodiazepine too, often by a different doctor who doesn’t see the full picture. Co-prescribing of sedative-hypnotics and opioids is well documented across large patient populations[12]. And the higher the opioid dose, the higher the stakes: harms from opioids increase substantially at high doses[13].
The overlap shows up in treatment settings too. People in medication treatment for opioid use disorder frequently also use benzodiazepines, whether prescribed for anxiety or obtained outside of care, and that co-use is where much of the excess mortality concentrates[8].
Who Is Most at Risk
The danger isn’t evenly distributed. A few situations stack the odds further, and recognizing yourself here is a reason to act sooner rather than a reason to panic.
- Older adults. Bodies clear these drugs more slowly with age, and older patients on long-term opioid therapy face an elevated risk of opioid-related adverse events, driven by physiological changes and by taking several medications at once[14].
- Anyone on a high opioid dose. Risk of harm rises sharply as the daily opioid dose climbs[13], and adding a benzodiazepine compounds it.
- People using illicit or counterfeit pills. The street supply increasingly mixes potent designer benzodiazepines with opioids, often without the user’s knowledge[10][11].
- Pregnancy. When an opioid is used in pregnancy, benzodiazepines and alcohol in the mix can worsen the severity of the newborn’s withdrawal, and maternal polypharmacy makes the picture harder to predict[15].
The Naloxone Caveat Everyone Should Know
Naloxone — the overdose-reversal medicine sold as Narcan — is one of the most important tools you can keep on hand. But its limit is the single most important thing to understand about a mixed overdose, and it’s the part people get wrong.
Naloxone reverses opioids. It does nothing to benzodiazepines. It knocks the opioid off its receptors and can restart breathing within minutes — but the benzodiazepine in the person’s system is untouched, and its sedating effect can outlast the naloxone dose. So even a person who wakes up after naloxone can sink back into dangerous sedation as it wears off and the benzo keeps working.
Here’s the practical version. If someone may have taken an opioid and won’t wake up, give naloxone even if a benzodiazepine is also involved. Then call 911 and stay, because the opioid may be only half of what’s suppressing their breathing. This is exactly why public-health guidance pairs naloxone with opioid risk: clinicians are advised to offer take-home naloxone to anyone on higher opioid doses or on a concurrent benzodiazepine, precisely because that combination raises overdose risk[4].
One worry deserves a direct answer, because it stops people from carrying naloxone: having it does not make anyone use more dangerously. When people who inject drugs were trained and given take-home naloxone, their drug use did not become riskier afterward[16]. Carrying it is pure upside.
What the FDA and CDC Actually Say
You may have heard there’s an official warning about this combination. There is, and it’s strong.
In 2016, the U.S. Food and Drug Administration added its most serious type of label warning — a boxed warning — to opioids and benzodiazepines, cautioning against using them together[2]. The same year, the CDC’s guideline for prescribing opioids for chronic pain advised clinicians to avoid prescribing benzodiazepines and opioids concurrently whenever possible[3][17]. Concurrent prescribing of the two has since been treated as a recognized safety problem, and health systems have built specific measures to flag and reduce it[1][9].
What this means for you as a patient: if you’re on both, you’re not necessarily doing anything wrong, and your prescribers may have had good reasons. But it is a flag to bring into the open, review with your doctor, and make a plan around — not to ignore, and not to fix on your own by abruptly stopping either drug.
What to Do if You’re on Both Right Now
If you take an opioid and a benzodiazepine, here are the practical, do-this-now steps — none of which involve quitting cold turkey.
- Tell every prescriber about both drugs. Co-prescribing often happens because no single doctor has the full list[12]. Closing that gap is the fastest safety win available to you.
- Keep naloxone at home and make sure someone you live with knows where it is and how to use it[4][16].
- Never use either drug alone, and don’t add alcohol — a third depressant — to the mix.
- Ask about a plan to come off one or both safely. Often the safest move is reducing the benzodiazepine under supervision while opioid use disorder, if present, is treated with medication. Don’t stop either abruptly on your own.
The Path off Both Drugs
This is the part worth holding onto: there is a way out, it’s well established, and it does not mean suffering through withdrawal alone. It does mean not stopping either drug abruptly, because each one has its own dangerous withdrawal — and that’s exactly why supervision makes it easier, not harder.
Treating the Opioid Side with Medication
If opioid use disorder is part of the picture, the most effective treatment is medication. Opioid agonist treatment with buprenorphine or methadone is highly effective and improves a wide range of outcomes, from staying in treatment to reduced opioid use and lower mortality[5]. These aren’t a matter of swapping one addiction for another — they’re the evidence-based standard of care, normally given under supervision, especially early on[18]. If you’re already in this kind of treatment and also using benzodiazepines, that’s important to disclose, because the co-use is where the added risk lives[8]. Being honest about it is what lets your team keep you safer, not a reason to be pushed out of care.
Compare buprenorphine and methadone →
Coming off the Benzodiazepine with a Taper
Benzodiazepines are not stopped suddenly after regular use, because abrupt withdrawal can be dangerous on its own. The safe route is a slow, supervised taper — a gradual, individualized reduction in dose that lets the nervous system re-adapt step by step. The same principle that guides modern opioid tapering applies: reductions are made gradually, often in increasingly small steps as the dose gets lower, to minimize withdrawal[6]. Coming off both safely is recognized as a real clinical goal, and there are established deprescribing strategies for people on both drugs at once[2].
For the full method — why it works and how slow it really goes — see how to taper off benzodiazepines safely → and what benzo withdrawal actually involves →.
Why a Supervised Plan Beats Going It Alone
It can be tempting to just stop — to flush both and be done. With these two drugs, that’s the most dangerous option. Stopping a benzodiazepine abruptly risks seizures; with opioids, even large swings in dose, up or down, are linked to higher overdose risk[7]. A clinician sequences the changes, manages symptoms, and keeps both tapers from colliding.
The good news is that the whole field has matured around exactly this problem. Evidence-based consensus guidelines now address the pharmacological management of dependence on benzodiazepines and opioids together, so the people treating you are working from a real playbook, not improvising[19]. You don’t have to design the path — you have to start it. The next step is a conversation with a clinician who handles both, and from there it becomes a plan, not a cliff.
Two other depressant combinations carry the same kind of danger — mixing benzodiazepines and alcohol and mixing opioids and alcohol.
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Frequently asked questions
Why is mixing benzodiazepines and opioids so dangerous?
Because both are central nervous system depressants that slow breathing, and together their effects are additive. Concurrent use of opioids and benzodiazepines produces additive respiratory and central-nervous-system depression that increases the risk of fatal overdose[1]. An opioid dose a person might have tolerated alone can become deadly once a benzodiazepine is also on board. That synergy is why the two classes carry the FDA’s strongest warning against being used together[2].
Does naloxone (Narcan) reverse a benzodiazepine overdose?
No. Naloxone reverses opioids but does nothing to benzodiazepines, and the benzo’s effect can outlast the naloxone dose. In a mixed overdose you should still give naloxone, because it can reverse the opioid and restart breathing, but you must call 911 and stay, since the benzodiazepine keeps depressing breathing after the naloxone wears off. Public-health guidance pairs take-home naloxone with opioid risk precisely because concurrent benzodiazepine use raises overdose risk[4].
What is the FDA boxed warning about opioids and benzodiazepines?
It is the FDA’s most serious type of label warning, added in 2016, cautioning against using opioids and benzodiazepines together because the combination can cause dangerous, potentially fatal respiratory depression[2]. The CDC’s 2016 opioid-prescribing guideline gives the same advice, telling clinicians to avoid prescribing the two concurrently whenever possible[3][17]. If you are on both, it is a reason to review the combination with your doctor, not to stop either drug abruptly on your own.
How do people end up taking both opioids and benzodiazepines?
Usually because chronic pain and anxiety overlap, so a person on a long-term opioid is also prescribed a benzodiazepine, often by a different prescriber who does not see the full medication list. Co-prescribing of sedative-hypnotics and opioids is well documented across large patient populations[12]. It is also common in people being treated for opioid use disorder, where benzodiazepine co-use is frequent and is linked to higher mortality[8].
If I take both, how do I come off safely?
Not by quitting cold turkey, because each drug has its own dangerous withdrawal. The opioid side, if there is a use disorder, is best treated with medication like buprenorphine or methadone, which is highly effective and lowers mortality[5]. The benzodiazepine comes off through a slow, supervised taper that reduces the dose gradually to minimize withdrawal[6]. A clinician sequences both so the changes do not collide, and established strategies exist for deprescribing the two together[2].
Who is most at risk from combining opioids and benzodiazepines?
Older adults are especially vulnerable, because aging bodies clear these drugs more slowly and older patients on long-term opioids already face elevated risk from physiological changes and polypharmacy[14]. Risk also climbs with higher opioid doses[13], and with illicit or counterfeit pills, since the street supply increasingly mixes potent designer benzodiazepines with opioids without the user’s knowledge[10].
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