Buprenorphine/Naloxone Drug Interactions: What to Avoid and What to Tell Your Doctor

Buprenorphine/Naloxone is an effective medication for opioid use disorder, but it can interact dangerously with other medications, supplements, and even certain foods. Knowing what to avoid — and what to tell your doctor — can keep you safe and ensure your treatment works as intended.

How Drug Interactions Work

A drug interaction happens when one substance changes how another substance works in your body. Interactions can:

• Increase side effects — making a medication's effects stronger or more dangerous than expected
• Decrease effectiveness — preventing a medication from working properly
• Create new risks — producing dangerous effects that neither drug would cause on its own

Buprenorphine is processed by an enzyme in your liver called CYP3A4. Medications that speed up or slow down this enzyme can significantly change how much Buprenorphine is in your system at any given time.

Major Drug Interactions

These interactions can be life-threatening. If you're taking any of the following, your doctor needs to know immediately:

Benzodiazepines

This is the most dangerous interaction. Combining Buprenorphine/Naloxone with benzodiazepines like Alprazolam (Xanax), Diazepam (Valium), Clonazepam (Klonopin), or Lorazepam (Ativan) significantly increases the risk of fatal respiratory depression — meaning your breathing can slow down or stop entirely.

The FDA boxed warning specifically highlights this risk. If you are currently taking a benzodiazepine, do not start Buprenorphine/Naloxone without discussing it with your doctor. In some cases, both medications may be used together under very close medical supervision, but this requires careful monitoring.

Other CNS Depressants

Any substance that slows down your central nervous system can compound the sedating effects of Buprenorphine. This includes:

• Alcohol — even moderate drinking increases the risk of respiratory depression
• Sleep medications like Zolpidem (Ambien) and Eszopiclone (Lunesta)
• Muscle relaxants like Cyclobenzaprine (Flexeril) and Carisoprodol (Soma)
• Sedating antihistamines like Diphenhydramine (Benadryl) and Hydroxyzine (Vistaril)

Full Opioid Agonists

Taking full opioid agonists like Oxycodone (OxyContin), Hydrocodone (Vicodin), Morphine, Fentanyl, or Heroin while on Buprenorphine/Naloxone can cause two problems:

• The full opioid may not work as expected because Buprenorphine occupies the receptors
• It can precipitate withdrawal symptoms in some situations

CYP3A4 Inhibitors (Increase Buprenorphine Levels)

These medications slow down the enzyme that breaks down Buprenorphine, causing it to build up in your body:

• Ketoconazole (antifungal)
• Itraconazole (Sporanox) (antifungal)
• Ritonavir (Norvir) and other HIV protease inhibitors

Higher Buprenorphine levels can increase the risk of side effects, including respiratory depression.

CYP3A4 Inducers (Decrease Buprenorphine Levels)

These medications speed up the enzyme, causing your body to clear Buprenorphine faster than normal:

• Rifampin (Rifadin) — used for tuberculosis
• Carbamazepine (Tegretol) — used for seizures and mood disorders
• Phenytoin (Dilantin) — used for seizures

Lower Buprenorphine levels can reduce its effectiveness, potentially leading to breakthrough cravings or withdrawal symptoms.

Moderate Drug Interactions

These interactions are less immediately dangerous but still important to discuss with your doctor:

Serotonergic Drugs (Risk of Serotonin Syndrome)

Combining Buprenorphine/Naloxone with medications that increase serotonin can cause serotonin syndrome — a potentially life-threatening condition with symptoms including agitation, rapid heartbeat, high blood pressure, fever, and muscle rigidity. Medications to watch include:

• SSRIs like Fluoxetine (Prozac), Sertraline (Zoloft), and Escitalopram (Lexapro)
• SNRIs like Venlafaxine (Effexor) and Duloxetine (Cymbalta)
• Triptans for migraines like Sumatriptan (Imitrex)

Many people with OUD also take antidepressants. This combination is often used safely with proper monitoring — but your doctor needs to know about both medications.

MAO Inhibitors

MAOIs like Phenelzine (Nardil) and Tranylcypromine (Parnate) can interact with Buprenorphine and increase the risk of serotonin syndrome and other serious effects. These are rarely prescribed today but are still important to mention.

Antiretrovirals

Some HIV/AIDS medications can affect Buprenorphine levels. If you're on antiretroviral therapy, your doctor may need to adjust your Buprenorphine/Naloxone dose.

Supplements and OTC Medications to Watch

Don't assume that over-the-counter or "natural" products are automatically safe with Buprenorphine/Naloxone:

• St. John's Wort — a CYP3A4 inducer that can lower Buprenorphine levels and reduce its effectiveness
• Kava — can increase sedation and CNS depression
• Valerian root — may increase drowsiness
• Diphenhydramine (Benadryl) — a sedating antihistamine that increases CNS depression risk
• Dextromethorphan (DXM) — found in many cough medicines, has serotonergic properties and can increase sedation

Food and Drink Interactions

Alcohol

This is the most important food/drink interaction to know about. Do not drink alcohol while taking Buprenorphine/Naloxone. Alcohol increases CNS depression and significantly raises the risk of respiratory depression, which can be fatal. This includes beer, wine, and spirits — even in moderate amounts.

Grapefruit Juice

Grapefruit and grapefruit juice inhibit the CYP3A4 enzyme, which can increase Buprenorphine levels in your body. While this is a less dangerous interaction than alcohol or benzodiazepines, it's still worth limiting grapefruit consumption during treatment.

What to Tell Your Doctor

Before starting Buprenorphine/Naloxone — and at every follow-up visit — make sure your doctor knows about:

• All prescription medications you take, including those prescribed by other doctors
• Over-the-counter medications, including pain relievers, allergy medications, and cold medicines
• Supplements and herbal products
• Alcohol use — be honest about how much and how often
• Recreational drug use — your doctor isn't there to judge; they need this information to keep you safe
• Any new medications prescribed by other providers during your treatment

Also tell any new healthcare provider (dentist, surgeon, urgent care doctor) that you are taking Buprenorphine/Naloxone before they prescribe anything to you.

Final Thoughts

Drug interactions with Buprenorphine/Naloxone range from inconvenient to life-threatening. The good news is that most can be managed or avoided with proper communication between you and your healthcare team. The most critical thing you can do is be completely honest about everything you're taking — prescribed or not.

For more about this medication, see our guides on Buprenorphine/Naloxone side effects and what Buprenorphine/Naloxone is and how it's used. If you need help finding it at a pharmacy, check Medfinder for availability near you.