Mad Honey and Heart Medication: Why the Combination Is Risky

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Your Health Magazine Contributor

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Mad Honey and Heart Medication: Why the Combination Is Risky

“Mad honey” sounds like a novelty, and it is often sold that way: a dark, slightly bitter honey from the Himalayan foothills of Nepal and the Black Sea coast of Turkey, said to give a mild buzz. What makes it different from the honey in your cupboard is a group of natural compounds called grayanotoxins, which bees carry over from the nectar of certain rhododendron flowers.

The effects of mad honey can vary widely because grayanotoxin levels are unpredictable. Even relatively small amounts can cause dizziness, nausea or light-headedness, while more significant poisoning can cause dangerous changes in heart rate and blood pressure. For people who take medicine for their heart or blood pressure, the risk deserves particular attention.

What grayanotoxin does in the body

Grayanotoxins act on the sodium channels that nerve and heart cells use to send signals. They hold those channels open, which disturbs the normal rhythm of the heart. They also trigger a reflex that strengthens the body’s “slow down” signal to the heart. The two classic effects are a slow heart rate (bradycardia) and low blood pressure (hypotension). In more serious cases, the electrical signal between the upper and lower chambers of the heart is delayed, which doctors call heart block.

Typical symptoms appear within minutes to a few hours of eating it:

• dizziness, weakness or fainting
• nausea, vomiting and sweating
• blurred vision or tingling around the mouth
• a pulse that feels unusually slow

Why heart and blood pressure medicines raise the stakes

Many common prescriptions are designed to do some of the same things grayanotoxin does, on purpose and in a controlled way:

• Beta-blockers slow the heart rate.
• Some calcium channel blockers, such as verapamil and diltiazem, slow the conduction of the heartbeat.
• Digoxin strengthens the body’s “slow down” signal to the heart, and has a narrow margin between a helpful and a harmful level.
• Heart rhythm medicines such as amiodarone and sotalol change the heart’s electrical cycle. Amiodarone can stay in the body for weeks or months after someone stops taking it.
• ACE inhibitors and ARBs lower blood pressure.

When the honey’s effect lands on top of a medicine that is already slowing the heart or lowering blood pressure, the two can add up. A resting heart rate that is perfectly normal on a beta-blocker leaves less room before a further drop becomes dangerous, and older adults with narrowed arteries are especially vulnerable to a sudden fall in blood pressure.

There have been no clinical trials of these combinations, so the risk is worked out from how the substances act and from real poisoning cases. For a plain-language breakdown by drug class, see this guide to how grayanotoxin interacts with heart and blood pressure medicines.

Other medicines and supplements to think about

Heart drugs are the main concern, but they are not the only one.

• Medicines that make you drowsy, such as sleeping tablets, anti-anxiety medicines, opioid painkillers and some antihistamines, can add to the dizziness and weakness the honey causes. That raises the risk of a fall, and it can make it harder to notice that the heart rate is dropping.
• Some epilepsy medicines, including drugs that affect sodium channels, have not been adequately studied in combination with grayanotoxins. There is no clinical evidence establishing how these combinations interact, so people taking antiseizure medication should not assume that mad honey is safe to use with their treatment.
• Some herbal supplements marketed for heart health or blood pressure, such as hawthorn or high-dose garlic extracts, may have a small additive effect too. The evidence here is thin, but it is worth mentioning to your pharmacist if you take them.

Why there is no “safe amount”

People often ask whether mad honey is safe, and if so, how much. The honest answer is that nobody can say for a given jar. The amount of grayanotoxin varies enormously from one harvest to the next. In one set of wild honey samples from Nepal analysed by researchers, the level of one grayanotoxin ranged from 0.75 to almost 65 milligrams per kilogram. The European Food Safety Authority’s 2023 risk assessment concluded that acute exposure to grayanotoxins in certain honey raises a health concern. The panel was 75% or more certain that a concentration of 0.05 milligrams per kilogram for the combined amount of grayanotoxins I and III would be protective against acute intoxication across age groups, while noting that this value does not account for other grayananes or potential genotoxic effects. It also noted that poisoning can be life-threatening for people with heart problems.

So two spoonfuls from two different jars can have very different effects, and a dose that one person tolerates can make another person seriously ill.

It rarely comes from a shop

Some documented poisonings have involved personally imported honey rather than conventionally purchased products. Hong Kong reported eight cases in 2024, and in each case the honey had been carried or mailed from Nepal by the patient or someone they knew.

The eight-case pattern is supported, but “Most poisonings do not involve a jar bought from a store” makes a broader worldwide claim than the evidence establishes. Hong Kong’s individual 2024 reports repeatedly describe personally imported Nepalese honey. Gifts like this have no label, no batch testing and no way of knowing how strong they are.

If a relative brings back a jar from a trek in Nepal or a holiday on Turkey’s Black Sea coast, it is worth asking where it came from before anyone in the family tastes it, especially anyone who takes heart medicine.

Questions to ask your doctor or pharmacist

If you are curious about mad honey and you take any regular medicine, these three questions get to the point quickly:

1. Does my medicine lower my heart rate or blood pressure?
2. Do I have any condition that affects the electrical rhythm of my heart?
3. What signs would tell me that my heart rate or blood pressure has dropped too low?

What to do if someone feels unwell

• If someone feels faint, very dizzy or notices a slow pulse after eating it, get medical help promptly rather than waiting for it to pass. In the US, Poison Control is available at 1-800-222-1222.
• Tell the medical team what was eaten, roughly how much and when, and list any medicines the person takes.
• If there is any honey left, keep it and its packaging. It helps doctors and health authorities work out where it came from and whether others are at risk.

The good news is that most people recover within a day with hospital care, which usually means fluids and a medicine to bring the heart rate back up. The point is to avoid needing that care in the first place. If you take any heart rhythm or blood pressure medicine, the safest choice is simply not to eat mad honey.

This article is for general information and is not medical advice. Talk to your doctor or pharmacist about any food or supplement if you take prescription medicine.