Paracetamol: pharmacology, prescribing and controversies
Open accessAbstract
Paracetamol (internationally known as acetaminophen) is the most common medicine encountered in paediatric practice. It is used widely by parents and health professionals and it has analgesic and antipyretic effects. Its short-term safety and efficacy are well established and it is readily available for purchase over the counter. Its mechanism of action is not fully understood but it is known to inhibit prostaglandin synthesis and is highly selective for cyclooxygenase enzymes in the central nervous system. It also has a weak anti-inflammatory action. An understanding of its pharmacology can significantly increase the apparent effectiveness and safety of this useful medicine. Oral paracetamol is used in children for mild-to-moderate pain and fever, including postimmunisation fever.1 It may also be given by intravenous infusion or per rectum when it is most commonly used for the short-term treatment of moderate pain, particularly after surgery, and for persistent fever. Unlike opioid analgesia, there is no dependence or tolerance seen with paracetamol, but there is a ceiling effect on analgesia and once this is achieved higher doses do not have an increased effectiveness. Its long-term use tends to deplete glutathione stores, which can enhance toxicity in overdose. Overdose may result in irreversible hepatotoxicity, which can be fatal. ### Absorption The pharmacokinetics of paracetamol in infants and children has been described in detail.2 Oral formulations have high bioavailability and around 80% of a dose is absorbed, mainly by passive diffusion. Rectal formulations have a reduced bioavailability compared with other routes and therefore require higher doses. Importantly, absorption through the gastric mucosa is negligible and therefore any process (or disease) that delays gastric emptying will slow down the absorption of an orally administered dose. The time to peak blood levels after oral administration of the drug in children (aged 6 months to 12 years) ranges from 0.5 to 1.8 h, …
Integrity signals
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Cites
Statistics
Claims the paper makes
7 of 21 cited sources checked · 4 supported · 0 flagged · accuracy not yet measured
- Premisecitation
One study without a placebo arm observed axillary temperature declining in the paracetamol group within minutes of administration.
“While the study did not include a placebo arm, axillary temperature began to decline in the paracetamol group within a few minutes of administration.”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [5] source
The Strengths and limitations section confirms there was no placebo-only group, and the Outcomes and Mean temperature by treatment group sections describe axillary measurements and falling temperatures in the paracetamol group. The text reports mean temperatures at 15-minute intervals but does not establish that the decline began within a few minutes of administration; no page numbers are available in our copy. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Premisecitation
A systematic review and meta-analysis found insufficient evidence to change guidelines on the association between paracetamol exposure in pregnancy or early infancy and childhood asthma.
“A systematic review and meta-analysis of studies reporting this association found that there was insufficient evidence to warrant changing guidelines.10”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [10] source
- Premisecitation
In premature neonates, one study found mean elimination half-life of rectally administered paracetamol was 11 hours for 28-32 week neonates and 4-5 hours for 32-36 week neonates.
“In premature neonates, the mean elimination half-life is longer still; one study found it was 11 h for 28-32 week old neonates (for rectally administered paracetamol) and 4-5 h in 32-36 week old neonates.7”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [7] van lingen, 1999, Pharmacokinetics and metabolism of rectally administered paracetamol in preterm neonates, Arch Dis Child Fetal Neonatal Ed source
- Premisecitation
Temperature decline was faster in children given ibuprofen or combined ibuprofen and paracetamol.
“However, the decline in temperature was more rapid in children treated with ibuprofen or ibuprofen and paracetamol in combination.5”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [5] source
- Premisecitation
In febrile children aged 6 months to 6 years, fever typically resolves in just over 1 hour (mean 71 minutes).
“Fever responds quickly and it typically takes just over 1 h to resolve fever in febrile children between 6 months and 6 years of age (a mean of 71 min).5”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [5] source
Table 2 (section labelled “Implications of this research”; page not given) reports a mean time to first fever clearance of 71.0 minutes, but only for children given paracetamol. The means were 42.2 minutes with ibuprofen and 45.5 minutes with both drugs, so 71 minutes is not a typical time across all the children studied. The Abstract confirms the stated age range. (LLM, conf=0.91)
Experimental — accuracy not yet measured
- Premisecitation
A retrospective study in Australia and New Zealand found that paracetamol overdose from medication errors is a leading cause of acute liver failure in children.
“A retrospective study conducted in Australia and New Zealand described paracetamol overdose, due to medication errors, being one of the leading causes of acute liver failure in children.11”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [11] source
- Premisecitation
A study reported paracetamol-glucuronide to paracetamol-sulfate ratios of 0.34 in neonates (1-2 days), 0.75 in children (3-9 years), 1.61 in older children (12 years), and 1.80 in adults.
“One study analysed the urinary excretion of the two conjugates (0-36 h) and found that the ratio of paracetamol-glucuronide to paracetamol-sulfate for neonates (1-2 days old), children (3-9 years) and older children (12 years old) was 0.34, 0.75 and 1.61, respectively, with an adult ratio of 1.80 (see figure 1).6”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [6] source
- Interpretationcitation
Dosing frequency recommendations for preterm neonates reflect their longer elimination half-life.
“The recommended dose frequency in preterm neonates reflects this.”
Quote in the paperSubstantial claim - Premisecitation
Two open-label randomised controlled trials found that paracetamol blunted the functional antibody response after childhood immunisation.
“Two open-label randomised controlled studies examined the effectiveness and safety of paracetamol suspension following childhood immunisation.These found a blunting of the functional antibody response in the paracetamol group.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [9] source
- Premisecitation
A study supporting weight-based dosing found that underweight or overweight children were at risk of inappropriate paracetamol doses with potential harm.
“One study which supported the use of a weight-based dose found that children who were underweight or overweight for their age were at risk of receiving inappropriate doses of paracetamol with the potential of causing harm.14”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [14] source
- Premisecitation
In a study of over 270 caregivers measuring 5 mL of 120 mg/5 mL paracetamol, the volumes measured ranged from 0.83 to 6.52 mL.
“Results showed the volumes measured ranged from 0.83 to 6.52 mL.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [13] source
- Premisecitation
Recent NICE guidelines have shifted focus from fever reduction to ensuring the child's comfort.
“The focus of recent National Institute for Health and Care Excellence (NICE) guidelines 8 has therefore shifted away from reducing fever to ensuring that the child is comfortable.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [8] National Collaborating Centre for Women's and Children's Health. Feverish illness in children: assessment and initial management in children younger than 5 years (full NICE guideline). Clinical guidance 160 National Centre for Health and Care Excellence. 2013. https://www.nice.org.uk/guidance/cg160 (accessed 7 Aug 2015).
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- May combine two claims. 12
- Classified as probably not a substantial claim. 3
May combine two claims.
PremisecitationParacetamol distributes widely in body fluids and has a large volume of distribution, which is greatest in preterm infants and declines with maturity to adult levels by about 1 year of age.
“Paracetamol is widely distributed in the body throughout the majority of body fluids and has a relatively large volume of distribution, which is largest in the preterm infant and reduces with maturity until it reaches adult levels at about 1 year.3”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [3] source
The Discussion reports that acetaminophen distributes throughout tissues and fluids, and that its volume of distribution falls from 109.7 l/70 kg at 28 weeks after conception to 72.9 l/70 kg by 60 weeks. The paper does not establish that volume of distribution reaches adult levels at about one year; its statement about reaching adult-like rates by 12 months concerns clearance (Methods). (LLM, conf=0.86)
Experimental — accuracy not yet measured
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationA recent article raised concerns about the lack of research into why caregivers of young children make medication errors and the growing prevalence of falsified medicines.
“However, this list is far from complete and a recent article has highlighted concerns regarding the lack of research available about the reasons behind medication errors made by caregivers of young children and of the increasing prevalence of falsified medicines used.12”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [12] Star, 2014, How safe is paracetamol?, Arch Dis Child source
May combine two claims.
PremisecitationIn children, oral paracetamol is indicated for mild to moderate pain and fever, including fever after immunisation.
“Oral paracetamol is used in children for mild-to-moderate pain and fever, including postimmunisation fever. 1”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [1] Paediatric Formulary Committee. BNF for children. London: BMJ Group, Pharmaceutical Press, and RCPCH Publications. http://www.medicinescomplete.com (accessed 2 May 2015).
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Rests on an assumption: Paracetamol has analgesic and antipyretic effects.
May combine two claims.
PremisecitationThe calibrated spoon was most accurate, and the oral syringe had the smallest variance.
“The calibrated spoon was the most accurate while the oral syringe had the smallest variance.13”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [13] source
May combine two claims.
InterpretationreasoningAdverse effects from paracetamol can result from poor prescribing and from accidental or intentional ingestion.
“As with all medicines, adverse effects can (and do) occur as a result of poor prescribing and following accidental or purposeful ingestion.”
Quote in the paperSubstantial claim- Rests on an assumption: Paracetamol overdose may cause irreversible hepatotoxicity that can be fatal.
- Rests on an assumption: Simultaneous administration of multi-ingredient medicines with prescribed paracetamol may cause inadvertent overdose.
- Rests on an assumption: Errors are more commonly made when prescribing instructions are unclear.
May combine two claims.
PremisecitationThe analgesic effect of paracetamol comes from the fraction entering the brain, possibly via serotonergic pathways.
“Analgesic activity is produced by the fraction that penetrates into the brain, possibly by an action upon serotonergic pathways.4”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [4] source
May combine two claims.
PremisecitationThe same authors repeated the study with meningococcal B vaccine and concluded that paracetamol reduced postimmunisation fever without significantly attenuating the immune response.
“However, the same authors have repeated this study in children receiving the meningococcal B vaccine in conjunction with other childhood immunisations and concluded that there is a reduction in postimmunisation fever that is not accompanied by any significant attenuation of the immune response.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [9] source
Probably not a substantial claim: may not pass S4 (based).
Interpretationnone givenParacetamol may have longer-term effects on general health that should not be overlooked.
“There may be longer term effects on general health that should not be overlooked-and it certainly should not be simply 'prescribed routinely' to all children admitted to hospital or given indiscriminately to all children who are febrile.”
Quote in the paperNot a substantial claimMay combine two claims.
PremisecitationIn children aged 6 months to 12 years, oral paracetamol reaches peak blood levels in 0.5 to 1.8 hours, similar to adults.
“The time to peak blood levels after oral administration of the drug in children (aged 6 months to 12 years) ranges from 0.5 to 1.8 h, broadly similar to adults.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [2] source
Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).
Interpretationnone givenParacetamol works best when the correct dose is administered by the correct route.
“It works optimally when the right dose is given by the right route.”
Quote in the paperNot a substantial claim- Rests on an assumption: Paracetamol has analgesic and antipyretic effects.
- Rests on an assumption: Paracetamol has a ceiling effect on analgesia, beyond which higher doses do not increase effectiveness.
- Rests on an assumption: Absorption through the gastric mucosa is negligible, so delayed gastric emptying slows absorption of oral paracetamol.
May combine two claims.
PremisecitationParacetamol crosses the blood-brain barrier rapidly; one report found peak cerebrospinal fluid levels in children 57 minutes after intravenous administration.
“It rapidly crosses the blood-brain barrier to the central nervous system; one report found peak cerebrospinal fluid levels in children after 57 min when administered intravenously.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [4] source
May combine two claims.
InterpretationcitationThe different metabolic pattern appears to have no clear clinical consequence, and by adulthood glucuronidation is the predominant pathway.
“There appears to be no clear clinical consequence of this different pattern of metabolism and by adulthood the predominant pathway is one of glucuronidation.”
Quote in the paperNot a substantial claimMay combine two claims.
PremisecitationRectal paracetamol has lower bioavailability than other routes, so higher doses are needed.
“Rectal formulations have a reduced bioavailability compared with other routes and therefore require higher doses.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [2] source
May combine two claims.
PremisecitationOral paracetamol formulations have high bioavailability, with about 80% of a dose absorbed primarily by passive diffusion.
“Oral formulations have high bioavailability and around 80% of a dose is absorbed, mainly by passive diffusion.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [2] source
The paper relies on this without support.
Paracetamol has analgesic and antipyretic effects.
“It is used widely by parents and health professionals and it has analgesic and antipyretic effects.”
The paper relies on this without support.
Paracetamol inhibits prostaglandin synthesis and is selective for cyclooxygenase enzymes in the central nervous system.
“Its mechanism of action is not fully understood but it is known to inhibit prostaglandin synthesis and is highly selective for cyclooxygenase enzymes in the central nervous system.”
The paper relies on this without support.
Paracetamol has a ceiling effect on analgesia, beyond which higher doses do not increase effectiveness.
“Unlike opioid analgesia, there is no dependence or tolerance seen with paracetamol, but there is a ceiling effect on analgesia and once this is achieved higher doses do not have an increased effectiveness.”
The paper relies on this without support.
Long-term paracetamol use depletes glutathione stores, which can enhance toxicity in overdose.
“Its long-term use tends to deplete glutathione stores, which can enhance toxicity in overdose.”
The paper relies on this without support.
Paracetamol overdose may cause irreversible hepatotoxicity that can be fatal.
“Overdose may result in irreversible hepatotoxicity, which can be fatal.”
The paper relies on this without support.
Absorption through the gastric mucosa is negligible, so delayed gastric emptying slows absorption of oral paracetamol.
“Importantly, absorption through the gastric mucosa is negligible and therefore any process (or disease) that delays gastric emptying will slow down the absorption of an orally administered dose.”
The paper relies on this without support.
Paracetamol is primarily metabolised in the liver to glucuronide and sulfate conjugates, which are excreted renally.
“Paracetamol is primarily metabolised in the liver to glucuronide and sulfate conjugates that are then excreted renally.”
The paper relies on this without support.
The sulfation pathway predominates in neonates, and glucuronidation matures around 2 years of age.
“The sulfation pathway predominates in neonates; the glucuronidation pathway takes time to develop and is mature at around 2 years of age.”
The paper relies on this without support.
A small proportion of paracetamol (5-10%) is oxidised by CYP2E1, which is present at lower levels in neonates, leading to less NAPQI formation.
“A small proportion of the dose (5-10%) is oxidised by CYP450-dependent pathways in the liver by the enzyme CYP2E1.This appears to be present at lower levels in neonates than in adults, leading to the formation of a smaller amount of the toxic intermediate metabolite N-acetyl-p-benzoquinone imine (NAPQI).”
The paper relies on this without support.
NAPQI is detoxified by glutathione, and insufficient glutathione leads to hepatotoxicity.
“NAPQI is normally detoxified by conjugation with glutathione and the bound NAPQI product is eliminated in the urine or bile.However, if there is not sufficient glutathione available, either as a result of malnutrition or if there is a large amount of NAPQI produced as in overdose, then hepatotoxicity may result (see figure 2).”
The paper relies on this without support.
The elimination half-life of paracetamol varies with age, being longer in neonates and preterm infants.
“The elimination half-life for paracetamol varies between neonates, infants, children and adolescents.In neonates born at term it is between 2.5 and 4 h, this is about 1 h longer than older children.”
The paper relies on this without support.
High temperatures in children cause parental anxiety and are a common reason for seeking medical attention.
“High temperatures in children cause parental anxiety and this is a common reason for seeking medical attention.”
The paper relies on this without support.
There is no evidence that reducing fever reduces morbidity or mortality.
“There is no evidence that this reduces morbidity or mortality.”
The paper relies on this without support.
Paracetamol is a component of several multi-ingredient over-the-counter medicines.
“In addition, paracetamol is a component of several multi-ingredient medicines sold over the counter.”
The paper relies on this without support.
Simultaneous administration of multi-ingredient medicines with prescribed paracetamol may cause inadvertent overdose.
“It is important for all involved to understand that the simultaneous administration of one of these, together with prescribed paracetamol may result in inadvertent overdose.”
The paper relies on this without support.
Errors are more commonly made when prescribing instructions are unclear.
“When prescribing paracetamol, it is important to try to avoid vague prescribing instructions such as 'take when required'; as errors are more commonly made when instructions are unclear.”
The paper relies on this without support.
There is debate about whether to use weight or age to determine the appropriate dose of paracetamol.
“There remains debate about whether prescribers should use weight or age to determine the appropriate dose of paracetamol and regular prescribers will be aware that the BNF-C has varied this advice over recent years.”
The paper relies on this without support.
Following concerns about hepatotoxicity at therapeutic doses, there has been a move to reduce the maximum total daily dose to 75 mg/kg/day from 90 mg/kg/day.
“Following concerns about hepatotoxicity at therapeutic doses, there has also been a move to reduce the maximum total daily dose to 75 mg/kg/day from 90 mg/kg/day.”
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- Authors
- Moriarty, C., & Carroll, W.
- Affiliations
- Chelsea and Westminster Hospital (GB)
- University Hospitals of North Midlands NHS Trust (GB)
- Corresponding author
- Carroll, Will
- ORCID
- Carroll, Will
- Venue
- Archives of disease in childhood - Education & practice edition
- Publisher
- BMJ
- Published
- 2016-05-20
- Volume
- 101
- Issue
- 6
- Pages
- 331-334
- ISSN
- 1743-0585 (ISSN-L)
- 1743-0593
- OpenAlex
- W2396402702
- Cited by
- 24
- References
- 13
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 1 · 2021: 5 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 2
- FWCI
- 2.05
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Archives of Disease in Childhood Education & Practice (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
- Health Sciences › Medicine › Emergency Medicine › Poisoning and overdose treatments
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Pharmaceutical studies and practices
- Keywords
- paracetamol, pediatric analgesia, antipyretics, pharmacokinetics, cyclooxygenase inhibition, glutathione depletion, rectal administration, bioavailability
- MeSH terms
- Acetaminophen, Adolescent, Child, Child, Preschool, Female, Fever, Humans, Infant
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-09-28.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-09-28.
Cited sources are checked by gpt-6-sol.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
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