Propranolol overdose: why it’s more dangerous than most people think
Why propranolol is more toxic in overdose than most beta-blockers, the warning signs, what to do, and what official reports and brand names in four countries show.
A propranolol overdose is a medical emergency. This beta-blocker can slow the heart to a dangerous degree, drop blood pressure and, because it gets into the brain, cause seizures and coma. Symptoms often start within 1 to 2 hours and can get worse fast. If someone took too much, call emergency services right away, even if they seem well at first.
At a glance
- Propranolol is “the most lipophilic beta-blocker” and crosses easily into the brain, which is why it can cause seizures in an overdose, according to StatPearls (NIH, updated July 2023).
- Beta-blocker overdose symptoms usually appear within 1 to 2 hours, but long-acting capsules such as Inderal LA may need longer monitoring, StatPearls says.
- In England, 52 deaths were linked to propranolol overdose in 2017, a 33% rise from 2012, according to a national patient safety investigation published June 15, 2021.
- A study in the Medical Journal of Australia (2025) found propranolol had the highest death rate relative to its use of any non-psychiatric medicine in poisoning suicides from 2013 to 2019.
- UK poison centers handled 363 intentional propranolol overdoses in 2022 and 2023; where the prescription’s purpose was known, it was anxiety in 111 of 121 cases.
- In August 2026, the UK medicines regulator (MHRA) confirmed it is reviewing propranolol’s overdose harms and whether its benefits outweigh its risks for anxiety.
What are the symptoms of a propranolol overdose?
Signs listed by MedlinePlus, the NHS and the official drug labels include:
- A very slow or irregular heartbeat (sometimes a fast one)
- Low blood pressure, dizziness, lightheadedness or fainting
- Trouble breathing or wheezing, especially in people with asthma
- Weakness, tiredness, sweating or shakiness
- Blurred or double vision
- Drowsiness, confusion, seizures or coma
- Low blood sugar, which MedlinePlus says is common in children
- Heart failure and shock in severe cases
Long-acting capsules are absorbed more slowly, so problems can start later. Get help even if the person seems fine. For warning signs that apply to any drug, see signs of an overdose.
A propranolol overdose is not peaceful or painless. People often need intensive hospital care to support the heart and blood pressure, and some are left with lasting effects. Early treatment works: MedlinePlus says survival is likely if heart rate and blood pressure can be corrected.
Why is propranolol more dangerous than other beta-blockers?
All beta-blockers slow the heart and lower blood pressure. Propranolol has extra properties that make an overdose harder to treat.
- It gets into the brain. StatPearls says propranolol “can easily cross the lipid cell and blood-brain barrier.” The UK’s Healthcare Safety Investigation Branch (now HSSIB) links this to seizures and coma.
- It is fat-soluble, and fat-soluble beta-blockers are more toxic. StatPearls says “the lipid-soluble beta-blockers are more toxic than the water-soluble agents.” HSSIB says propranolol can “rapidly cause significant chemical damage to the heart.”
- Dialysis doesn’t remove it. The FDA label says propranolol “is not significantly dialyzable,” so treatment focuses on supporting the heart and blood pressure.
Even some doctors don’t know this. A 2025 commentary in the Medical Journal of Australia said “many physicians are unaware” of how dangerous propranolol can be in overdose.
What should you do if someone took too much propranolol?
- Call emergency services right away if the person has a slow heartbeat, chest pain, trouble breathing, feels dizzy or shaky, has had a seizure, has collapsed or can’t be woken.
- If you’re not sure, call poison control now and follow their advice, even if the person seems fine.
- Don’t make them vomit unless poison control or a health professional tells you to.
- Keep the bottle or box and a list of anything else they may have taken, especially antidepressants, other heart medicines or alcohol.
- Stay with them. If they are drowsy but breathing, turn them on their side (the recovery position). Start CPR if they stop breathing and you are trained.
What if you took an extra dose by accident?
The NHS says “an overdose of propranolol can be very serious” and advises urgent help for anyone who took more than their prescribed dose. Call your pharmacist or poison control and say what you took and when. If you go to hospital, don’t drive yourself. Never take 2 doses at once to make up for a missed one.
What happens at the hospital?
Hospital teams watch the heart closely with an ECG and check blood pressure, blood sugar, breathing and alertness. Treatment can include activated charcoal, fluids through a drip, breathing support, glucagon and other medicines that raise heart rate and blood pressure, high-dose insulin therapy given with sugar, medicines to stop seizures, a temporary pacemaker and, in the most severe cases, a heart-lung machine (ECMO).
MedlinePlus says even people with milder symptoms may need to stay overnight. With prompt care, many people recover: the FDA label for InnoPran XL says most propranolol overdoses are mild and respond to supportive care.
Is propranolol safe to take for anxiety?
Propranolol is often prescribed for the physical signs of anxiety, such as shaking and a pounding heart. The UK licenses it for anxiety symptoms. In the US, MedlinePlus says it is “sometimes used to treat anxiety,” though anxiety is not on the Inderal LA or InnoPran XL labels. Australia’s Inderal listing includes “anxiety tachycardia” (a fast heartbeat from anxiety).
Concern is growing because of who is overdosing. A 2025 UK poison center study found anxiety was the reason for the prescription in 111 of the 121 overdoses where the reason was known. In 43 of 61 cases where someone was prescribed both propranolol and an antidepressant, they took both. The authors concluded that “using propranolol to manage anxiety can be dangerous.” NICE in the UK and the Royal Australian and New Zealand College of Psychiatrists do not recommend propranolol for treating anxiety.
If you take propranolol for anxiety, don’t stop it suddenly, and tell your prescriber if you are struggling or having thoughts of harming yourself. Australian researchers recommend supplying more toxic medicines in smaller amounts, so you can ask your pharmacist about this. If you also take an antidepressant, see our Lexapro overdose guide.
Which medicines and conditions make propranolol riskier?
- Other heart and blood pressure medicines, such as calcium channel blockers and digoxin. StatPearls says taking a beta-blocker and a calcium channel blocker together in overdose “may cause profound hypotension,” a severe drop in blood pressure. See also clonidine overdose.
- Antidepressants and antipsychotics, especially tricyclic antidepressants, which can make heart effects worse.
- Alcohol. MedlinePlus says “alcohol may increase the amount of propranolol in your body.” Ask your doctor about drinking, and read about alcohol overdose.
- Asthma. The FDA label says people with bronchospastic lung disease “should not receive beta-blockers.”
- Diabetes. Propranolol can hide the warning signs of low blood sugar, such as a fast heartbeat.
Why shouldn’t you stop propranolol suddenly?
Stopping suddenly can harm your heart. US labels report worsening chest pain (angina) and heart attacks after people stopped propranolol abruptly. The NHS lists withdrawal effects such as an irregular heart rate, sweating and shaking. If you want to stop, your doctor will lower the dose gradually.
Who is most at risk?
- People prescribed propranolol for anxiety, especially if they also have depression or thoughts of self-harm.
- Young women and teens. In the 2022 to 2023 UK data, 69% of people were women, the median age was 32 and 14% were under 18.
- People with heart or lung disease, who StatPearls says are more likely to have poor outcomes.
- Young children, who often get low blood sugar. Keep all medicines locked away.
- Anyone who took long-acting capsules, where symptoms can be delayed.
Our analysis: what official reports show
| Date | Where | Source | Key finding |
|---|---|---|---|
| 2015 data | US | US poison centers, cited by StatPearls | 10,577 single-substance beta-blocker exposures, 82% of them unintentional (all beta-blockers, not only propranolol) |
| June 15, 2021 | England | HSIB national investigation | 52 deaths linked to propranolol overdose in 2017, up 33% from 2012; 67% were women; 354 poison service enquiries in 2017/18 |
| April 2025 | Australia | Medical Journal of Australia study of 2013 to 2019 deaths | Highest fatal toxicity of any non-psychiatric medicine: 204 deaths per million years of use, against 32.0 for all medicines |
| July 2025 | UK | British Journal of Clinical Pharmacology study of 2022 and 2023 poison center data | 363 intentional overdoses; 69% women; median age 32; of 159 with a known outcome, 110 recovered fully and 35 died |
| May 14, 2026 | UK | MHRA reply to a coroner | UK patient leaflet says propranolol “is severely toxic if used in overdose”; MHRA weighing a safety bulletin article |
| August 6, 2026 | UK | MHRA reply to two royal colleges, reported by The Pharmaceutical Journal | Review of overdose harms, warnings and the balance of benefit and risk for anxiety |
Method note: We searched for official investigations, regulator documents and poison center studies on propranolol overdose in the US, Puerto Rico, Canada, Australia, India and the UK, and included only those we could open and verify on October 7, 2026. We found no national propranolol report for Canada, India or Puerto Rico.
Three findings stand out. In Australia, propranolol’s death rate relative to its use was more than six times the average for all medicines in the study. In both English and UK data, about two-thirds of people affected were women (67% and 69%). And across reports from 2021 to 2026, UK investigators and regulators have returned to the same concern: its use for anxiety.
Propranolol’s names around the world
Propranolol has different brand names and forms in each country, so a pill or box from abroad may look unfamiliar.
| Place | Brands we verified | Forms | How some brand pills look |
|---|---|---|---|
| US and Puerto Rico | Inderal LA and InnoPran XL (ANI); Hemangeol (Eton, for infants); generics labeled “propranolol” | Tablets, oral liquid, extended-release capsules | Inderal LA: blue or white-and-blue capsules with three rings and “INDERAL LA” plus the strength |
| Canada | Inderal-LA (Pfizer Canada), Lupin-Propranolol LA | Extended-release capsules, 60 to 160 mg | Inderal-LA: blue or white-and-blue with 3 narrow white bands; Lupin: marked “PRO” |
| Australia | Inderal, Deralin (prescription only, Schedule 4) | Tablets, 10 to 160 mg | Inderal: pink, round, marked “10” or “40”; Deralin: red, marked “PP” and strength, “G” on the back |
| India | Ciplar (Cipla), Inderal (Abbott), Betacap (Sun Pharma), Provanol (Intas) and many others | Tablets, including 10 mg | Varies by maker |
Approved uses differ too. In Canada, the two long-acting capsules we checked are approved only for high blood pressure and angina, according to the Inderal-LA monograph. In the US, InnoPran XL is approved only for high blood pressure, and Hemangeol is an oral liquid approved only for infants with infantile hemangioma.
Method note: We compared US FDA labels for Inderal LA (November 2023), InnoPran XL (August 2026) and Hemangeol (August 2026), Health Canada monographs for Inderal-LA (June 2021) and Lupin-Propranolol LA (January 2022), healthdirect Australia listings and, for India, brand and maker names from a major Indian online pharmacy. Brand lists are not complete.
How can you check a pill you think is propranolol?
Generic propranolol looks different from one maker to the next. To check a pill, see pictures of propranolol pills or use our pill imprint search. For a box, search the NDC or Canadian DIN with our NDC and DIN lookup, or read why your refill looks different.
A matching imprint does not prove a pill is real, because fake pills can copy real ones. Get medicines only from a pharmacy, and learn how to spot fake pills.
Common questions
Can you overdose on propranolol?
Yes. The NHS says an overdose of propranolol can be very serious, and it can cause a dangerously slow heartbeat, low blood pressure, seizures and coma. Call emergency services or poison control right away, even if the person seems well.
How long does it take for a propranolol overdose to cause symptoms?
Symptoms of a beta-blocker overdose usually start within 1 to 2 hours, according to StatPearls. Long-acting capsules such as Inderal LA and InnoPran XL are absorbed more slowly, so symptoms can be delayed. That’s why people often need to be watched in hospital, sometimes overnight.
What happens if I accidentally take two propranolol?
Call your pharmacist or poison control and tell them what you took and when. The NHS advises getting urgent advice if you’ve taken more than your prescribed dose. Go to the emergency room if you feel dizzy, faint, short of breath or notice a slow heartbeat.
Is there an antidote for a propranolol overdose?
There is no single antidote. Hospitals use several treatments together, such as glucagon, medicines that raise blood pressure, high-dose insulin therapy and sometimes a temporary pacemaker. Dialysis does not remove propranolol, which is one reason early care matters.
Can you drink alcohol while taking propranolol?
Ask your doctor first. MedlinePlus says alcohol may increase the amount of propranolol in your body. Alcohol also makes an overdose more dangerous.
