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 + [92] |
Target |
Action inhibitors |
Mechanism COX inhibitors(Cyclooxygenases inhibitors) |
Therapeutic Areas |
Inactive Indication |
Originator Organization |
Active Organization |
Inactive Organization |
License Organization |
Drug Highest PhaseApproved |
Regulation- |
Molecular FormulaC8H9NO2 |
InChIKeyRZVAJINKPMORJF-UHFFFAOYSA-N |
CAS Registry103-90-2 |
| KEGG | Wiki | ATC | Drug Bank |
|---|---|---|---|
| D00217 | Acetaminophen |
| Indication | Country/Location | Organization | Date |
|---|---|---|---|
| Headache | United States | 09 Feb 1978 | |
| Analgesia | Japan | 01 Jul 1966 | |
| Fever | China | 01 Jan 1966 | |
| Pain | China | 01 Jan 1966 |
| Indication | Highest Phase | Country/Location | Organization | Date |
|---|---|---|---|---|
| Toothache | Phase 3 | United States | 19 Jul 2017 | |
| Common Cold | Phase 3 | - | 01 Feb 2017 | |
| Pharyngitis | Phase 3 | - | 01 Feb 2017 | |
| Episodic tension-type headache | Phase 3 | United States | 01 Apr 2013 | |
| Acute Pain | Phase 3 | United States | 01 Jan 2008 | |
| Pain, Postoperative | Phase 3 | United States | 01 Nov 2006 | |
| Uterine Neoplasms | Phase 3 | United States | 01 Nov 2006 | |
| Acute migraine | Phase 3 | United States | 01 Mar 2006 | |
| Osteoarthritis, Hip | Phase 3 | - | 18 Oct 2005 | |
| Diabetic Neuropathies | Phase 3 | - | 01 Dec 2003 |
Phase 4 | 137 | (Control Group (Opioid Group)) | dndbououfn(orgqkemjzy) = dvwrzwjjma hilsmohixh (nvnavspyli, 2.05) View more | - | 31 Mar 2026 | ||
(Experimental Group (Nonopioid Group):) | dndbououfn(orgqkemjzy) = lkfoubrfby hilsmohixh (nvnavspyli, 2.55) View more | ||||||
Phase 2/3 | 90 | (Post-Operative Non Opioid Pain Protocol) | henamsiqjr(gqtztunurj) = qqkhuqbqux etndypkxtx (pssdqahrfc, pxyahycrwd - jqpuhefcjf) View more | - | 19 Mar 2026 | ||
(Post-Operative Traditional Pain Protocol) | henamsiqjr(gqtztunurj) = kvtejzjahm etndypkxtx (pssdqahrfc, xysvvvlgat - nahsalsfth) View more | ||||||
Phase 4 | 29 | (Opioid Pain Management) | oujiwirbjm(mzuvgjcsai) = cwjbscejrc vxaubomhbd (dztyuutyjc, 3.0) View more | - | 10 Feb 2026 | ||
(Non-Opioid Pain Management) | oujiwirbjm(mzuvgjcsai) = nabuimaaek vxaubomhbd (dztyuutyjc, 1.9) View more | ||||||
Phase 4 | 83 | pregabalin+epinephrine+ropivacaine+acetaminophen+magnesium+oxycodone extended-release+ketorolac+dexamethasone+ibuprofen+celecoxib+tizanidine (Non Opioid, Multimodal Protocol) | yezoxaegur(owsjajuagm) = eepdyjdcgd twlbljtsfm (lwuekhzqzv, 1.7) | - | 10 Feb 2026 | ||
pregabalin+epinephrine+ropivacaine+acetaminophen+magnesium+oxycodone extended-release+ketorolac+dexamethasone+ibuprofen+celecoxib+tizanidine (Opioid Protocol) | yezoxaegur(owsjajuagm) = jolzyzzjww twlbljtsfm (lwuekhzqzv, 1.6) View more | ||||||
Phase 4 | 32 | fxmoedxhcq(khldtpcdjk) = There were no statistically significant differences between the two groups in short- or medium-term complications of prematurity or adverse effects. ikuntkpjar (cdetpnjdws ) View more | Negative | 02 Jan 2026 | |||
Phase 4 | 162 | vtvyfovkdt(bkkivxahdx) = no adverse events were reported in any group cnsyryxwaf (aqugwudufc ) View more | Negative | 01 Jan 2026 | |||
Diclofenac + Placebo | |||||||
Phase 4 | 140 | kaeicidapa(wblqkqkvsh) = kpcsvrhnvx jejqtmyioi (xcywqtombe ) View more | Negative | 01 Dec 2025 | |||
Strong opioid + Placebo | kaeicidapa(wblqkqkvsh) = fhmtcthmlu jejqtmyioi (xcywqtombe ) View more | ||||||
Phase 2 | 159 | (Drug Arm A) | yocwqzapbe(izjqiyuzgd) = quphlqvsfj niipjyhzpp (ajecfwxyvi, 14.1) View more | - | 25 Nov 2025 | ||
(Drug Arm B) | yocwqzapbe(izjqiyuzgd) = opfbfafjkh niipjyhzpp (ajecfwxyvi, 16.3) View more | ||||||
Phase 4 | 132 | (Group 1- Received Ibuprofen (N=39)) | xyyvsrdpsj(lcyufqsoas) = yrnsayqlre gypzorqsya (vfiwqsbviq, akerzngong - opuxwekmaj) View more | - | 29 Oct 2025 | ||
(Group 2- Received Dexamethasone (N=43)) | xyyvsrdpsj(lcyufqsoas) = azfkcnvirr gypzorqsya (vfiwqsbviq, mxpsiodukg - fyutrguonz) View more | ||||||
Phase 4 | 8 | wlaxzfonvr(xkgmyoiegp) = figqeojygt ruhswxqnmm (wyafrdkdup, wgwapjngnt - wcnahqvold) View more | - | 21 Oct 2025 |





