Taking too much paracetamol can cause a potentially serious overdose, including severe liver damage. The important point is that you may feel well or have only mild symptoms at first, so symptoms alone cannot tell you whether an overdose is dangerous. South African professional information for paracetamol states that suspected overdose requires immediate medical assessment even when the person has no symptoms.
If you think you, a child or someone else has taken more paracetamol than recommended, get medical advice immediately rather than waiting for symptoms. In South Africa, you can contact the Poisons Information Helpline on 0861 555 777, which operates 24 hours a day, or go to the nearest emergency department. If the person has collapsed, is having a seizure, has difficulty breathing, cannot be awakened or is otherwise critically unwell, call emergency services on 112 from a mobile phone or 10177 for an ambulance.
For general information about medicines available without a prescription, see the OTC Pharmacy Medicine Side Effects hub. You can also read our related parent guide to paracetamol side effects.
How too much Paracetamol Symptoms can be linked to medicines or supplements
Paracetamol is widely used to relieve pain and reduce fever. Problems can arise when more than the recommended amount is taken at one time, when excessive doses are taken repeatedly, or when several products containing paracetamol are used without realising that they contain the same active ingredient. Taking too much can injure the liver and, in severe cases, can be life-threatening.
Possible early symptoms
During the first 24 hours after an overdose, symptoms may include:
- nausea or feeling sick
- vomiting
- loss of appetite
- pale skin
- abdominal or upper stomach pain
- sweating or generally feeling unwell.
However, a person may have few or no symptoms at first. Mild early symptoms do not reliably show how serious the overdose is.
This delay is one reason suspected paracetamol overdose should not be managed by simply watching for symptoms at home. Medical treatment can be time-sensitive, while evidence of liver injury may appear later.
Symptoms that can develop later
As liver or other organ injury develops, symptoms can become more serious. Possible warning signs include:
- worsening abdominal or upper stomach pain
- persistent nausea or vomiting
- yellowing of the skin or whites of the eyes, known as jaundice
- dark urine or unusually pale stools
- severe tiredness
- confusion or marked drowsiness
- unusual bleeding or bruising
- greatly reduced urine output.
South African professional information notes that liver damage may only become apparent after the initial period following an overdose. MedlinePlus likewise advises getting medical help after more than the recommended dose even if there are no symptoms.
Medicines and product categories that may be associated with this symptom
The most obvious source is a medicine in which paracetamol is the only active ingredient, but accidental overdose can also happen when more than one paracetamol-containing product is taken.
Check all medicines you are using
Paracetamol may be found in:
- pain and fever medicines
- some cold and flu preparations
- combination pain medicines
- some prescription and non-prescription combination products.
A person might, for example, use one product for pain and another for cold or flu symptoms without noticing that both contain paracetamol. The FDA specifically warns that paracetamol — called acetaminophen in the United States — is included in hundreds of single-ingredient and combination medicines.
Check the active ingredients and strength on each packet, bottle or patient information leaflet. Do not assume two products are safe to combine simply because their brand names or intended uses are different.
Supplements are not the usual source of paracetamol exposure. If you are taking supplements alongside medicines, however, tell the doctor, pharmacist or poison information specialist about everything you have taken so they have a complete picture.
People with certain health conditions or risk factors may require particularly careful assessment. South African paracetamol professional information identifies factors including liver disease, chronic heavy alcohol use, malnutrition and some interacting medicines as relevant to paracetamol toxicity.
Red flags: when this symptom may need urgent medical attention
A suspected paracetamol overdose itself is a reason to seek urgent professional advice. Do not wait for severe symptoms before asking for help. Prompt assessment is important because a person can initially appear relatively well even when significant poisoning has occurred.
Go to an emergency department or obtain emergency medical help urgently if there is:
- severe or worsening abdominal pain
- repeated vomiting
- yellow skin or eyes
- confusion or unusual drowsiness
- very little or no urine
- a seizure
- collapse or loss of consciousness
- difficulty breathing
- inability to wake the person.
These may be signs of a serious medical problem and should not be managed at home.
You can also read about other serious medication side effects and guidance on when to see a doctor for medication side effects.
If the overdose was intentional, or the person has suicidal thoughts or may take more medicine, treat the situation as an emergency. Do not leave the person alone while arranging urgent medical help.
Why feeling fine does not mean everything is fine
Paracetamol poisoning is unusual because serious liver injury can develop after a period in which symptoms are mild or absent. South African professional information states that mild symptoms during the first two days do not reflect the potential seriousness of an acute overdose.
Hospitals can use information about the amount and timing of paracetamol taken together with blood tests and other clinical information to assess the risk. An antidote called N-acetylcysteine (NAC) may be used when clinically indicated, and prompt treatment is important.
What to track before speaking to a doctor or pharmacist
If too much paracetamol may have been taken, collect whatever information you can while arranging medical help.
Useful details include:
- the person’s age and approximate weight
- the exact product name
- the strength shown on the packet or bottle
- how many tablets, capsules or measures may have been taken
- approximately what time each dose was taken
- whether the amount was taken all at once or over several hours or days
- any other pain, cold, flu or prescription medicines used
- vitamins or supplements taken at the same time
- existing liver or kidney problems
- significant alcohol use
- any symptoms that have appeared.
Take the medicine packaging, bottle, blister packs or patient information leaflet with you if possible. Poisoning specialists commonly use details such as the person’s age and weight, product strength, amount taken and timing when assessing an exposure. Do not delay seeking help because some of this information is missing.
What not to do without medical advice
If you suspect too much paracetamol has been taken, do not try to judge the seriousness of the situation from symptoms alone.
Do not deliberately make the person vomit or try to treat a suspected overdose using food, drinks, supplements or other home remedies. Seek professional advice before taking another paracetamol-containing dose.
Do not calculate whether an overdose is “safe” and then delay medical attention. The risk assessment can depend on factors such as the product, amount, timing, body weight, repeated dosing and individual health circumstances.
If other prescription medicines are being taken, do not stop or alter those medicines unless a healthcare professional advises you to do so.
Related side-effect guides and reporting options in South Africa
A suspected overdose needs medical attention first. Reporting a side effect is not a substitute for emergency assessment or poisoning advice.
If you experienced a suspected adverse reaction to a medicine, information on how to report side effects in South Africa is available through our reporting guide. SAHPRA’s Med Safety system allows members of the public and healthcare professionals to report suspected adverse drug reactions.
For broader information, browse side effect symptoms A-Z or read more about medication side effects.
Frequently asked questions
Is feeling sick after too much paracetamol a common side effect?
Nausea and vomiting can occur after a paracetamol overdose, but they should not be treated as ordinary side effects if you know or suspect that more than the recommended amount has been taken. More importantly, some people have no early symptoms at all.
How long can symptoms from too much paracetamol last?
There is no single timeframe that applies to everyone. Early symptoms may occur within the first day, while signs of liver injury can be delayed. South African professional information notes that evidence of liver damage may become apparent 12 to 48 hours or later after an overdose.
Because of this delayed course, waiting to see how long symptoms last is not a safe way to decide whether treatment is needed.
Should I stop taking paracetamol if I think I have taken too much?
If you suspect an overdose, seek urgent advice from a doctor, hospital or the Poisons Information Helpline before taking another paracetamol-containing dose. Do not stop unrelated prescription medicines without advice from the healthcare professional assessing you.
When should I seek help?
Seek medical help immediately whenever a paracetamol overdose is suspected, even if you currently feel well. South African professional information specifically recommends contacting a doctor, hospital or Poison Control Centre immediately in suspected overdose because serious effects may be delayed.
If there is collapse, a seizure, serious confusion, difficulty breathing, inability to wake the person or another life-threatening symptom, call emergency services immediately.
This information is for general education and does not diagnose or treat paracetamol poisoning. Suspected overdose requires individual assessment by a healthcare professional or poisons specialist.