What does an Amanita pantherina overdose look like, and what should you do? Panther cap poisoning usually starts within one to two hours with vomiting, dizziness and confusion. It can then move into deep sleep, unresponsiveness or seizures. Compared with fly agaric, panther cap is more likely to cause coma. If someone can't be woken, is having a seizure or is breathing strangely, call emergency services straight away. Most people recover within a day with hospital care, but nobody should wait it out alone.
Call emergency services (112 in Europe, 911 in the US) at once if the person can't be woken, has a seizure, or has slow or noisy breathing. For milder symptoms, call a poison centre (US: 1-800-222-1222). Don't make them vomit, don't give alcohol or sleeping pills, and never leave them alone. In a Slovenian poison-centre series, 5 of 17 panther cap patients were comatose, against 2 of 32 fly agaric patients (Vendramin 2014). In a US review, 25 of 34 people were symptomatic and nobody died (Moss 2019).
This page is a safety guide, not a dosing guide. If you're still deciding whether to take panther cap at all, read who should avoid Amanita pantherina and our potency and risk guide first.
What Are the Signs of Amanita Pantherina Poisoning?
The signs fall into three groups: stomach, excitation and depression. They overlap. A person can be vomiting and agitated one hour and then sink into a sleep they can't be woken from the next, and that switch from one state to another is exactly what makes panther cap poisoning so confusing for friends and family who are watching it happen.
- Stomach: nausea, heavy vomiting, sometimes diarrhoea and abdominal cramps.
- Excitation: agitation, confusion, muscle twitching, jerking movements, hallucinations, shouting or restlessness.
- Depression: deep sleep, unresponsiveness, floppy limbs, slow breathing and coma.
- Other signs: dizziness, unsteady walking, slurred speech, sweating, drooling and changes in pupil size.
In a 15-year review from the Oregon Poison Center, panther cap cases were more symptomatic than fly agaric cases on every measure. Stomach symptoms appeared in 80% versus 35%. Central nervous system depression appeared in 70% versus 35%, and excitation in 70% versus 35% (Moss 2019).
Seizures are uncommon but documented. In 2025, Italian doctors described a 56-year-old woman found unresponsive about four hours after eating garden mushrooms she believed were parasols. She had small pupils and jerking of all four limbs, and an EEG confirmed seizure activity (Cirronis 2025). A Czech report from 2023 describes coma with prolonged convulsions after the same species (Handl 2023).
How Is Panther Cap Different From Fly Agaric Poisoning?
Panther cap tends to sedate more, and fly agaric tends to agitate more. Both mushrooms contain ibotenic acid, which excites the brain, and muscimol, which sedates it. The balance between them differs, and patients show it.
A study from the Ljubljana poison centre compared 32 fly agaric patients with 17 panther cap patients. Fly agaric patients were more often confused (26 of 32) and agitated (20 of 32). Panther cap patients were more often comatose: 5 of 17, against 2 of 32 for fly agaric. The authors suggested the two should be treated as two separate syndromes (Vendramin 2014).
Why does this matter? Because a quiet, sleeping person can look perfectly safe to the people around them, when in fact their breathing is slowing and nobody has noticed that they've stopped responding to their name. Someone who has taken panther cap and becomes very drowsy needs closer watching, not less. Our page on the differences between fly agaric and panther caps covers how the two species compare in general.
When Do Symptoms Start and How Long Do They Last?
Usually within one to two hours, and almost always within six. In the Oregon series, all but one symptomatic patient developed symptoms within six hours. Six patients had symptoms for under six hours, and 15 had symptoms that lasted less than 24 hours (Moss 2019).
Most people recover fully within a day. Not all. The worst point can come several hours in, after the person seemed to be getting better and everyone around them had started to relax. Vomiting can be followed by a lull and then deep sedation. Don't take an early improvement as the end of it.
For the normal timeline at intended doses, see our article on Amanita pantherina onset and duration. This page is about what happens when things go wrong.
When Should You Call an Ambulance?
Call emergency services at once if any of these happen. Don't wait to see whether it passes.
- The person can't be woken, or wakes only briefly and drifts off again.
- There's a seizure, or jerking movements that don't stop.
- Breathing is slow, irregular, noisy or gurgling.
- Their lips or face turn blue or grey.
- They're so agitated or confused that they could hurt themselves or others.
- A child or a pet has eaten any amount.
- They also took alcohol, sleeping pills, opioids or other sedatives.
For milder symptoms, such as vomiting and dizziness in someone who is awake and talking, call a poison centre for advice. In the US, the Poison Help line is 1-800-222-1222. In Europe, call 112 or your national poison centre. In the UK, call 111, or 999 for an emergency.
Children are at special risk. A 3-year-old boy in the Oregon series ate panther cap, became agitated and then lethargic, and needed intubation and three days in intensive care (Moss 2019). A review of childhood cases found that small children can become seriously ill from amounts an adult would barely notice (Benjamin 1992).
What Should You Do While You Wait for Help?
Keep the person safe, keep them breathing, and gather information for the medical team. Here's what helps and what doesn't.
Do
- Stay with them the whole time.
- If they're drowsy or unconscious but breathing, place them on their side in the recovery position so vomit can't block the airway.
- During a seizure, move hard objects away, cushion the head and time the seizure. Don't hold them down or put anything in their mouth.
- Keep the room calm and dim if they're agitated.
- Note what was taken, how much, in what form and at what time.
- Keep any leftover mushroom, capsules, packaging or vomit for the doctors.
Don't
- Don't make them vomit. It can cause choking in a drowsy person.
- Don't give alcohol, sleeping pills or "something to calm them down".
- Don't give coffee to "wake them up", or put them in a cold shower.
- Don't let them drive, swim or wander off.
- Don't leave them to "sleep it off" alone.
Mushroom identification helps the hospital. Doctors in Japan have even used DNA testing on vomit to confirm the species (Ota 2025). A whole leftover mushroom is far easier, so bring it if you can.
What Happens in Hospital?
Treatment is supportive. There's no specific antidote for muscimol or ibotenic acid, so the hospital's job is to keep the person safe and breathing while the body clears the compounds on its own, which usually takes less than a day. Doctors watch breathing and heart rate, give fluids, and treat agitation or seizures, often with benzodiazepines. Patients who can't protect their airway may be intubated for a short time.
Most patients go home within a day. In the Oregon series of 34 cases, no one died (Moss 2019). That good outcome reflects medical care, though, not the mushroom being harmless. Several of those patients needed a breathing tube.
Be honest. Tell them exactly what was taken, even if it was taken on purpose. They need to know about any other substances too. Panther cap combined with alcohol is a particular concern, which we cover in Amanita pantherina and alcohol.
How Can You Lower the Risk?
The safest choice is not to take panther cap at all. If you still choose to, a few simple rules, none of which cost anything, will cut the chance that an evening ends with an ambulance.
- Never forage it yourself unless you're an expert. Several published cases involve people who thought they'd picked an edible parasol mushroom.
- Start far lower than with fly agaric, and never take a second dose on the same day.
- Never combine it with alcohol, sedatives or other drugs.
- Never take it alone. Make sure a sober person knows what you took.
- Store it locked away from children and pets.
Our Amanita pantherina identification guide explains the features that set it apart from lookalikes.
Frequently Asked Questions
Can Amanita pantherina kill you?
Deaths are rare, but serious poisoning is well documented, including coma and seizures. In a US poison-centre series of 34 cases there were no deaths, though some patients needed intubation. The risk rises with high doses, children, and mixing with alcohol or sedatives. Treat any severe symptoms as an emergency.
How long does panther cap poisoning last?
Most cases resolve within 24 hours. Symptoms usually begin within one to two hours and almost always within six. Some people feel tired or unsettled for a day or two afterwards. Anyone who seemed to improve and then becomes drowsy again needs medical attention.
Should I make someone vomit after eating panther cap?
No. Forcing vomiting can make a drowsy person choke and isn't recommended by poison centres. Call emergency services or a poison centre instead. If the person is unconscious but breathing, put them on their side in the recovery position.
Is there an antidote for Amanita pantherina?
No. There's no specific antidote for muscimol or ibotenic acid. Hospital care focuses on breathing, fluids and controlling agitation or seizures. Most patients recover fully with this supportive treatment.
What should I tell the poison centre?
Say what was taken, roughly how much, in what form, and when. Describe the symptoms, the person's age and weight, and any alcohol, medicines or drugs taken too. Keep any leftover mushroom or packaging, because it helps confirm the species.
Related Articles
- Who Should Avoid Amanita Pantherina
- Amanita Pantherina Potency and Risk Guide
- Amanita Pantherina Onset and Duration
- Symptoms of Amanita Muscaria Poisoning
- Amanita Pantherina and Alcohol
Sources
- Vendramin A, Brvar M. Amanita muscaria and Amanita pantherina poisoning: two syndromes. Toxicon. 2014;90:269-272. PubMed 25173077
- Moss MJ, Hendrickson RG. Toxicity of muscimol and ibotenic acid containing mushrooms reported to a regional poison control center from 2002-2016. Clin Toxicol (Phila). 2019;57(2):99-103. PubMed 30073844
- Cirronis M, Giampreti A, Eleftheriou G, et al. Coma and confirmed epileptiform activity induced by Amanita pantherina poisoning. Toxicon. 2025;254:108208. PubMed 39662530
- Handl L, Nováček M, Šín R, Čechurová L. Loss of consciousness and prolonged convulsions due to Amanita pantherina intoxication. Neuro Endocrinol Lett. 2023;44(8):500-505. PubMed 38131173
- Benjamin DR. Mushroom poisoning in infants and children: the Amanita pantherina/muscaria group. J Toxicol Clin Toxicol. 1992;30(1):13-22. PubMed 1347320
- Tsujikawa K, Mohri H, Kuwayama K, et al. Analysis of hallucinogenic constituents in Amanita mushrooms circulated in Japan. Forensic Sci Int. 2006;164(2-3):172-178. PubMed 16464551
- Ota K, Taira K, Ito I. Molecular identification of Amanita ibotengutake from patient vomit specimens in mushroom poisoning. Clin Toxicol (Phila). 2025;63(11):906-911. PubMed 40948393