Foxglove Poisoning Symptoms: The 4-Stage Digoxin Timeline, the 2-Leaf Case That Caused Heart Block, and What to Do in the First 30 Minutes
Two foxglove leaves once put a man in intensive care for 10 days. Here’s the hour-by-hour poisoning symptom timeline and what to do in the first 30 minutes.
Foxglove poisoning almost never happens as one dramatic moment. It moves through a fairly predictable sequence over roughly half a day: stomach upset within a couple of hours, confusion and visual disturbances by hour six, and, in the worst cases, a dangerously slow or irregular heartbeat by hour eight to twelve. That staging comes straight out of the emergency-medicine literature on cardiac glycoside poisoning, and it holds whether the person swallowed a seed pod, brewed the leaves into tea, or a dog chewed through a stem in the border.
This guide walks through that hour-by-hour timeline, a real published case where two foxglove leaves caused complete heart block in a 22-year-old man, why the leaves get mistaken for two common kitchen-garden herbs often enough to send adults to the emergency room, and exactly what to do in the first 30 minutes if you suspect an ingestion — in a person or a pet.
I’ve grown foxglove in my own border for years, and the thing that surprises most new gardeners is how ordinary the first-year rosette looks. Nothing about a knee-high clump of soft, oval leaves screams toxic — which is exactly why the identification section below matters as much as the medical timeline. If you’re growing foxglove and want the full biennial-to-perennial care picture first, our foxglove growing guide covers that; this article is specifically about what happens if any part of the plant is eaten.
The 4-Stage Digoxin Timeline: What Happens Hour by Hour
Foxglove’s toxic compounds are cardiac glycosides — digitoxin in Digitalis purpurea, digoxin in related species — and they all work the same way: they block the sodium-potassium (Na/K-ATPase) pump that heart muscle cells use to reset themselves after every beat. In a therapeutic dose, that’s a controlled effect used in heart-failure medication. In an uncontrolled dose from a garden plant, the same mechanism follows a recognizable four-stage pattern, according to the emergency toxicology reference LITFL: gastrointestinal symptoms typically appear 2 to 4 hours after ingestion, blood glycoside levels peak around hour 6, and life-threatening cardiac effects tend to show up between hours 8 and 12.
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| Stage | Hours After Ingestion | Signs in Adults | Signs in Children | Signs in Pets (Dogs, Cats, Horses) |
|---|---|---|---|---|
| 1. Latent | 0–2 hrs | Often no symptoms yet; occasionally mild nausea as the glycosides absorb | Same latent window, but a toxic dose is reached on far less plant material because of lower body weight | May already be drooling or pawing at the mouth if the plant tasted bitter |
| 2. Gastrointestinal | 2–4 hrs | Nausea, vomiting, diarrhea, abdominal pain, loss of appetite | Same symptoms, faster dehydration risk given smaller body mass | Vomiting, diarrhea, drooling, loss of appetite |
| 3. Peak / Neurological | ~6 hrs | Confusion, weakness, headache, dizziness, visual disturbances (objects tinged yellow-green) | Lethargy and confusion that are easy for a caregiver to mistake for tiredness | Weakness, stumbling, disorientation |
| 4. Cardiac | 8–12+ hrs (can arrive far sooner in a large ingestion) | Slow or irregular pulse, palpitations, fainting; in severe cases, heart block or cardiac arrest | Same mechanism, but children reach dangerous heart rates on smaller absolute doses | Irregular heartbeat, weak pulse, collapse; in severe cases, heart failure |
The single biggest takeaway from that table: gastrointestinal symptoms come first and cardiac symptoms come last, which is exactly why “I only feel a bit sick” is not a reason to wait and see — the dangerous stage hasn’t arrived yet. It’s also why the timeline is a typical pattern, not a guarantee. The National Capital Poison Center notes that cardiac glycoside concentration varies by individual plant, by season, and by species, which is precisely why the case below reached the cardiac stage in about two hours instead of eight.
The Two Leaves That Put a Man in Intensive Care for 10 Days
A 22-year-old man in Ireland blended two large foxglove leaves from his own garden with apple, cucumber, and lettuce into a homemade juice, according to a case report in the Irish Medical Journal covered by the Irish Times. About two hours later he became unwell. By the time he reached the emergency department at University Hospital Galway, his heart rate had dropped to 40 beats per minute and his ECG showed complete heart block — the electrical signal between the heart’s upper and lower chambers had stopped getting through at all. He also developed acute kidney injury. He spent 10 days in the hospital’s coronary care unit before his heart rate normalized and his kidneys recovered.
Two other published cases underline the same point with different amounts. A 55-year-old woman who mistook foxglove for borage bought at a nursery ate five leaves baked into a savory pie; her blood digoxin level measured 10.4 micrograms per liter against a therapeutic range of 0.8 to 2.0, and it took 12 days in hospital, including a stretch of advanced heart block, before she was discharged. In a separate case, a woman who drank tea steeped from an entire foxglove plant over several hours didn’t develop dangerous arrhythmias at all — just a persistent slow pulse (as low as 48 beats per minute) and gastrointestinal pain — and was discharged after 48 hours. Same toxin, same mechanism, three very different outcomes from three different doses and preparations.
Why “How Many Leaves Is Dangerous?” Is the Wrong Question
There is no scientifically defensible answer to “how many foxglove leaves will make someone sick,” and any article that gives you a clean number is oversimplifying. Cardiac glycoside concentration differs between individual plants, changes with the season, and varies by species — which is exactly why poison control’s own guidance stops short of naming a safe threshold. The honest version of the “2-leaf” story isn’t “two leaves is the danger line.” It’s “two leaves, in one documented case, was enough to stop a healthy 22-year-old’s heart’s electrical conduction for ten days” — a data point about how little margin for error this plant leaves, not a dosing chart.
That unpredictability is a direct consequence of the mechanism. Once enough cardiac glycoside molecules bind and disable the Na/K-ATPase pump, intracellular calcium builds up faster than the heart muscle can clear it, which triggers the abnormal electrical afterbeats that show up on an ECG as everything from a slow, blocked rhythm to a fast, chaotic one. Hyperkalemia — elevated blood potassium — is often an early lab sign of a serious acute overdose, because the same disabled pump is the one that normally moves potassium back into cells. The yellow-green visual halos (xanthopsia) people associate with digitalis toxicity are classically a sign of chronic, low-level overdose in patients already taking heart medication rather than a reliable early clue in a one-time plant ingestion — though several poisoning cases still report some visual disturbance, so it’s worth mentioning to a poison control operator or ER doctor even if it seems minor. Every commonly grown ornamental foxglove species shares this same mechanism; our breakdown of six Digitalis species and their toxicity covers whether any of them are meaningfully “safer” (short answer: no).
Foxglove vs. Comfrey vs. Borage: The Mix-Up That Sends Adults to the ER
Unlike most garden poisonings, which involve small children or curious pets, a striking number of adult foxglove poisonings happen because someone deliberately ate the leaves — thinking they were a different plant entirely. Both documented cases above happened because foxglove was mistaken for a kitchen herb: one for borage bought at a nursery, one for a plant the drinker believed was safe to make tea from. Before flowering, a young foxglove rosette really does resemble comfrey and borage at a glance, especially to someone who isn’t a trained forager.
The most reliable test doesn’t require an expert eye — run a finger along the leaf edge. According to the Woodland Trust, foxglove leaves have a distinctly toothed, serrated margin, while comfrey leaves are smooth and untoothed despite their rough, coarse feel. Borage leaves fall in between visually but, like comfrey, aren’t sharply toothed the way foxglove’s are; garden references generally describe young borage leaves as oval, rough-textured, and covered in stiff, silvery-white bristly hairs with wavy rather than serrated edges. Foxglove’s hairs, by contrast, feel soft and almost velvety rather than bristly. Texture plus margin, together, are the two checks worth doing before any leaf from an unlabeled plant goes anywhere near a cutting board.
| Plant | Leaf Margin | Texture | Growth Habit Before Flowering |
|---|---|---|---|
| Foxglove (Digitalis purpurea) | Toothed, serrated | Soft, velvety hairs | Low basal rosette of oval leaves in year one; toxic cardiac glycosides in every part |
| Comfrey (Symphytum officinale) | Smooth, untoothed | Rough, stiff bristly hairs | Large upright clump of lance-to-oval leaves; not cardiotoxic, but its own internal-use risk is well documented (liver-toxic pyrrolizidine alkaloids) — it isn’t a “safe” plant to confuse foxglove with, just toxic in a different way |
| Borage (Borago officinalis) | Wavy, not sharply toothed | Rough, stiff silvery-white bristly hairs | Large oval basal leaves, upright habit; not cardiotoxic |
The single biggest takeaway from that comparison: a toothed, serrated leaf edge combined with soft rather than bristly hairs is the closest thing to a reliable field test for foxglove before it flowers — and any homegrown “herb” leaf that fails that test should go nowhere near tea or cooking until someone can confirm the species. Skin contact with foxglove foliage can also irritate sensitive skin even without ingestion; our guide to foxglove problems and safe handling covers gloves and cleanup after pruning or deadheading.
What to Do in the First 30 Minutes
If you know or strongly suspect someone ate part of a foxglove plant, the first 30 minutes matter more than anything else in this article. Do not try to make the person vomit — that isn’t recommended for cardiac glycoside ingestion and can complicate treatment. Instead:
| Situation | What to Do Right Now |
|---|---|
| Not sure they actually ate it, no symptoms yet | Call Poison Control (1-800-222-1222 in the US) and describe exactly what was eaten; they’ll tell you whether to monitor at home or go in |
| Confirmed ingestion, mild nausea or stomach upset only | Call Poison Control immediately — don’t wait for symptoms to worsen before calling |
| Any dizziness, irregular pulse, fainting, or chest discomfort | Go to the emergency room now; call Poison Control from the car or once you arrive rather than delaying transport |
| A dog, cat, or horse ate any part of the plant | Call ASPCA Animal Poison Control at (888) 426-4435 and your veterinarian immediately, even if the animal seems fine |
Bring a leaf, photo, or the plant tag with you if at all possible — positive identification speeds up treatment and can rule out other look-alikes entirely. Emergency teams typically confirm exposure with an ECG and blood tests, then treat symptomatically with IV fluids, potassium correction, and cardiac monitoring; a specific antidote (digoxin immune Fab) exists for severe cases but, notably, none of the three published cases above needed it — supportive care alone was enough even for the complete heart block case.
Recovery: What Happens After Treatment
With prompt treatment, the prognosis for foxglove poisoning is genuinely good — all three cases discussed in this article ended in full recovery, and death from foxglove ingestion is considered unlikely when medical care starts quickly, according to UF Health. What “recovery” looks like in practice, though, is not a same-day discharge: expect anywhere from 2 days (mild cases with only gastrointestinal symptoms and a slow pulse) to 10–12 days of hospital monitoring for cases that reach the cardiac stage, since abnormal heart rhythms from cardiac glycosides can resurface for days after the original ingestion even as the person starts to feel better. That’s the main reason emergency physicians keep patients on a monitor well past the point symptoms subside, rather than discharging as soon as vomiting stops.
Frequently Asked Questions About Foxglove Poisoning
How long after eating foxglove do symptoms start?
Gastrointestinal symptoms like nausea and vomiting typically begin 2 to 4 hours after ingestion, with cardiac effects following by hour 8 to 12 in the classic pattern. Real cases vary: one documented case reached complete heart block in about 2 hours, while another with a slower-releasing preparation didn’t show its worst symptoms until 17 hours after ingestion.
Can touching foxglove leaves make you sick?
Skin contact with foxglove foliage can cause contact dermatitis (irritation, redness, itching) in sensitive individuals, but that’s a different mechanism from the cardiac effects of ingestion — it comes from direct skin contact, not absorption into the bloodstream. Wearing gloves when pruning or deadheading avoids it; see our full foxglove problems and safe handling guide for details.
Is foxglove poisoning usually fatal?
No — with prompt medical attention, death from foxglove poisoning is considered unlikely, and every case referenced in this article ended in a full recovery. That said, without treatment, cardiac glycoside poisoning can progress to fatal arrhythmias, which is why every case above involved a hospital stay rather than home monitoring.
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→ Plan My Garden LayoutAre all foxglove species equally toxic?
Yes. The cardiac glycoside mechanism is shared across cultivated Digitalis species — a paler flower color or a “softer-looking” species is not a safety difference. Our guide to six foxglove species and their toxicity breaks down the differences that do exist (mainly bloom color, hardiness, and habit) and confirms none of them are meaningfully less dangerous if eaten.
What should I do if my dog or cat eats foxglove?
Call ASPCA Animal Poison Control at (888) 426-4435 and your veterinarian right away, even before symptoms appear. Watch for vomiting, diarrhea, drooling, weakness, or an irregular heartbeat, and don’t wait for multiple symptoms to show up before calling — pets reach dangerous doses on far less plant material than an adult human.
Sources
- ASPCA. Foxglove — Toxic and Non-Toxic Plants Database. ASPCA Animal Poison Control
- National Capital Poison Center. Foxglove: Toxic to the Heart. Poison Control (poison.org)
- LITFL. Digoxin Toxicity — Critical Care Compendium. Life in the Fast Lane
- Case Report of Accidental Intoxication following Ingestion of Foxglove Confused with Borage. PMC (National Library of Medicine)
- A Case of Intoxication with Tea Made from Digitalis purpurea. PMC (National Library of Medicine)
- Digitalis Poisoning after Accidental Foxglove Ingestion, Irish Medical Journal, reported by The Irish Times
- Woodland Trust. Foxglove (Digitalis purpurea) — Identification and Safety
- UF Health. Foxglove Poisoning — Conditions and Treatments. University of Florida Health
This article is for general information and is not a substitute for professional medical or veterinary advice. If you suspect foxglove poisoning in a person, call Poison Control at 1-800-222-1222 (US); for a pet, call ASPCA Animal Poison Control at (888) 426-4435 or your veterinarian immediately.
