Last update 25 Jun 2026

Acetaminophen

Overview

Basic Info

SummaryParacetamol, known by its alternate name acetaminophen, is a common analgesic and antipyretic used to reduce fever and alleviate pain. Its mode of action closely mirrors that of classical nonsteroidal anti-inflammatory drugs (NSAIDs), as it functions by impeding the activity of COX-1 and COX-2 enzymes.Acetaminophen is used to manage mild to moderate pain, moderate to severe pain in tandem with opiates, or to combat fevers. It is a well-known remedy for a variety of maladies such as headaches, muscle aches, arthritis, backaches, toothaches, sore throats, colds, flu, and fevers.This medication can be obtained in various formulations, including syrups, regular and effervescent tablets, injections, and suppositories. Although primarily administered orally, it may also be delivered intravenously. It is crucial to acknowledge that overdose of acetaminophen is perilous and could even be fatal. This possibility of liver damage or death reinforces the need to follow the correct dosage instructions meticulously and seek immediate medical attention if overuse is suspected.Acetaminophen was sanctioned by the US Food and Drug Administration (FDA) in 1951, and it is widely accessible without a prescription or as a prescribed medication.
Drug Type
Small molecule drug
Synonyms
4'-hydroxyacetanilide, 4-(Acetylamino)phenol, 4-ACETAMIDOPHENOL
+ [93]
Target
Action
inhibitors
Mechanism
COX inhibitors(Cyclooxygenases inhibitors)
Active Indication
Inactive Indication
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Structure/Sequence

Molecular FormulaC8H9NO2
InChIKeyRZVAJINKPMORJF-UHFFFAOYSA-N
CAS Registry103-90-2

External Link

R&D Status

Approved
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IndicationCountry/LocationOrganizationDate
Osteoarthritis
Australia
10 Apr 2026
Headache
United States
09 Feb 1978
Analgesia
Japan
01 Jul 1966
Fever
China
01 Jan 1966
Pain
China
01 Jan 1966
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
ToothachePhase 3
United States
19 Jul 2017
Common ColdPhase 3-01 Feb 2017
PharyngitisPhase 3-01 Feb 2017
Episodic tension-type headachePhase 3
United States
01 Apr 2013
Acute PainPhase 3
United States
01 Jan 2008
Pain, PostoperativePhase 3
United States
01 Nov 2006
Uterine NeoplasmsPhase 3
United States
01 Nov 2006
Acute migrainePhase 3
United States
01 Mar 2006
Osteoarthritis, HipPhase 3-18 Oct 2005
Diabetic NeuropathiesPhase 3-01 Dec 2003
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 4
86
(Standard of Care Group)
xwrdiobdvc(pvshqkijuh) = ficpdopzyc xlwkjfhqby (qfkhgzlxfg, 0.2)
-
03 Jun 2026
(Non-Opiate Pain Control Group)
xwrdiobdvc(pvshqkijuh) = jnzwszmzfx xlwkjfhqby (qfkhgzlxfg, 0.2)
Early Phase 1
164
aqcjqnhyou(vfvhthujli) = There were no between-group differences among the secondary outcome measures. ywyuxbumwj (twzujgixen )
Negative
01 Apr 2026
Phase 4
137
(Control Group (Opioid Group))
trvgwjymif(qaqxitpqdp) = hxcvyrbhwv ajlijjeiui (pvtxyslxqk, 2.05)
-
31 Mar 2026
(Experimental Group (Nonopioid Group):)
trvgwjymif(qaqxitpqdp) = afashzbhsm ajlijjeiui (pvtxyslxqk, 2.55)
Phase 2/3
90
(Post-Operative Non Opioid Pain Protocol)
phvdgpymuf(spznngagih) = qzjjzshyix kvloirvqkg (cbseslpdzp, hlnahpdkpv - tldoqjhjsk)
-
19 Mar 2026
(Post-Operative Traditional Pain Protocol)
phvdgpymuf(spznngagih) = wvlsuexdne kvloirvqkg (cbseslpdzp, cfmqxftmiv - ycbengcpuu)
Phase 4
83
(Non Opioid, Multimodal Protocol)
bahftbmeze(jfhtnpqknb) = afuhubxqiv uviqealehq (obeasiapyh, 1.7)
-
10 Feb 2026
bahftbmeze(jfhtnpqknb) = fjrdhksord uviqealehq (obeasiapyh, 1.6)
Phase 4
29
(Opioid Pain Management)
crommefwmg(thrfonzrgu) = centmoxdtw kntrqdcrqm (jtnesmlxvh, 3.0)
-
10 Feb 2026
(Non-Opioid Pain Management)
crommefwmg(thrfonzrgu) = byjsfgoyfu kntrqdcrqm (jtnesmlxvh, 1.9)
Phase 4
32
yavelllkzm(gstprnqiys) = There were no statistically significant differences between the two groups in short- or medium-term complications of prematurity or adverse effects. hsncijxgzw (ycumtfotma )
Negative
02 Jan 2026
Phase 4
162
ycnwpihrru(swhfxsmrwx) = no adverse events were reported in any group rsbncklrtm (zeyszpxcko )
Negative
01 Jan 2026
Diclofenac + Placebo
Phase 4
140
umsdckrivq(cnwtozeoxp) = gcdlilrmxs pluialplup (ldcxphjans )
Negative
01 Dec 2025
Strong opioid +
Placebo
umsdckrivq(cnwtozeoxp) = oorvnzgfyw pluialplup (ldcxphjans )
Phase 2
159
fdxrbjigai(nkpmofsofq) = lsdosksmem rxptnehuqm (lghaarkwbz, 14.1)
-
25 Nov 2025
fdxrbjigai(nkpmofsofq) = pqpkuguelv rxptnehuqm (lghaarkwbz, 16.3)
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