paracetamol


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ac·et·a·min·o·phen (APAP),

(as-et-ă-mi'nō-fen),
An antipyretic and analgesic, with potency similar to that of aspirin.
Synonym(s): paracetamol

paracetamol

(păr′ə-sē′tə-môl′, -môl′)

paracetamol

paracetamol

An over-the-counter analgesic used for headaches, muscle or joint pain, and fever, which lacks anti-inflammatory activity.
 
Therapeutic range
10–25 mg/L
 
Critical value
≥ 300 mg/L

Toxicology
Overdose can cause fatal liver failure. Up to 10% of hospitalisations for overdose and 40% of acute hepatic failure are linked to paracetamol overdose, which is more often accidental—e.g., children, alcoholics—than suicidal. Doses of > 150 mg/kg/24 hours cause acute liver failure.

Clinical stage of paracetamol toxicity
1. 1–24 hours—Non-specific.
2. 24–48 hours—Right upper quadrant pain, tenderness with elevated liver enzymes.
3. 72–96 hours—Marked increase in liver enzymes; fulminant hepatic failure, coagulopathy, acidosis.
4. 4–14 days—Liver recuperates or patient dies.

Pathogenesis of paracetamol overdose
90% is metabolised in the liver to non-toxic glucuronide and sulphate conjugates; 5% is oxidised by cytochrome p450 to NAPQI, which covalently binds to hepatocyte macromolecules, leading to hepatocyte death; 5% is excreted unchanged in urine.

Specimen
Blood, urine.
 
Method
Immunoassay-FPIA.

paracetamol

A drug widely used to relieve pain and reduce fever. The drug does not irritate the stomach, as ASPIRIN does, but overdose causes liver and kidney damage and may cause death from liver failure. 15 g or more is potentially serious. The victim remains well for a day or two and liver failure develops between the third and fifth day. The drug is on the WHO official list. Brand names are Alvedon, Calpol Disprol Paediatric, Infadrops, Medinol and Salzone. Preparations that include paracetamol include Cosalgesic, Distalgesic, Domperamol, Fortagesic, Kapake, Midrid, Migraleve, Paradote, Paramax, Remedeine and Solpadol.
acetaminophen; N -acetyl- p -aminophenol; paracetamol a non-opioid analgesic with little or no anti-inflammatory action; first-line painkiller of choice; used with care in patients with hepatic or renal impairment, or alcohol dependency, or those taking metoclopramide; overdose causes severe liver damage and death; recommended adult dose: daily maximum of 4 g (i.e. 8 × 500 mg tablets) (see Table 1)
Table 1: Principles of pain management
StepPain typeManagement regimeExamples of drug
1Mild to moderateNon-opioid analgesics:
Paracetamol
  • NSAIDs:

  • Pyrazoles

± Adjuvant drugs:
Paracetamol
Aspirin; ibuprofen pheylbutazone;
dipyrone
Amitriptyline
Gabapentin
Mexilitine
Ketamine
2Moderate to severeLess potent opioidsCodeine
  • Dihydrocodeine

  • Dextropropoxyphene

± Non-opioid analgesics
± Adjuvant drugs
Paracetamol
As above
3SeverePotent opioidsMorphine
Tramadol
Fentanyl
Oxycodone
± Non-opioid analgesics
± Adjuvant drugs
Paracetamol
As above

Pain management should address both the nociceptive and neuropathic components of pain.

NSAIDs, non-steroidal anti-inflammatory drugs.

paracetamol

see acetaminophen.

acetaminophen, paracetamol

an analgesic and antipyretic drug in dogs. It is contraindicated for cats because of serious side-effects which include intravascular hemolysis, methemoglobinemia and hepatic necrosis.
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