Mad Honey Drug Interactions: Evidence & Medication Risks

Already taken mad honey with a medicine?

If someone collapses, has a seizure, has trouble breathing, or cannot be awakened, call emergency services immediately: 911 in the US, or your local emergency number. For other concerning exposures, contact a poison center promptly. In the US, call 1-800-222-1222. See Poison Control's guidance. Tell the specialist which medicines and supplements were taken, the amount and time of the honey exposure, and any symptoms.

What is documented about mad honey?

Mad honey can contain grayanotoxins. A slow heart rate (bradycardia), low blood pressure (hypotension), and abnormal heart rhythms are documented poisoning effects, including in people who were not combining it with a medicine. The National Capital Poison Center explains that these effects can be life-threatening.

A 2025 Utah Poison Control case describes a patient who had previously used mad honey without problems but later developed symptoms requiring hospital care. Previous uneventful use does not establish that another exposure will be safe.

Beta-blockers: an observed concern, with important limits

A 2022 retrospective study of 117 patients with mad honey poisoning found an association between beta-blocker use and hospitalization. Only four patients were taking beta-blockers. That small subgroup and the study's observational design limit how confidently its result can be applied to an individual or used to estimate the size of an interaction.

The 2023 EFSA assessment also discusses a study suggesting greater cardiovascular risk in patients with cardiovascular disease receiving treatment such as beta-blockers. These findings support caution; they are not controlled trials proving that every heart or blood-pressure medicine has the same interaction.

What about blood-pressure medicines, Viagra, alcohol, or sedatives?

Do not assume an unstudied combination is safe. A medicine's known effects can be a reason to ask a clinician about a possible combined risk, but a plausible mechanism is not a measured mad-honey interaction.

For example, sildenafil prescribing information documents blood-pressure effects and interactions with certain other medicines. It does not establish a mad-honey-specific interaction, a safe amount, or a waiting interval. The sources used for this article likewise do not establish a comprehensive interaction list for calcium-channel blockers, digoxin, antiarrhythmics, alcohol, opioids, or benzodiazepines.

Grapefruit and CYP3A4: what we cannot claim

The FDA explains that grapefruit affects some medicines through CYP3A4 and other mechanisms. This does not establish how grayanotoxins are metabolized. EFSA reported that information on grayanane biotransformation in mammals was unavailable to its assessment. We therefore cannot substantiate claims that grapefruit, antibiotics, antifungals, or other CYP3A4 modifiers predictably strengthen or weaken mad honey.

How to use this information

Bring your actual medication and supplement list to your clinician or pharmacist. Do not stop, skip, or adjust prescribed medicines to make room for mad honey. No dose adjustment or spacing schedule is established by the evidence discussed here.

This is an editorial summary of the linked sources, not an individual medical assessment. For broader context, see our mad honey safety information and guide to why a universal safe dose cannot be specified.