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paracetamol, combinations excl. psycholeptics

N02BE51

Forms & Strengths

Fixed-dose combination tablets (Paracetamol 325mg to 500mg combined with opioids, NSAIDs, or antihistamines)
Oral suspension and elixirs
Suppositories for rectal administration
Effervescent powders and tablets

Adult Dosing

Paracetamol component: 325 mg to 1000 mg orally every 4 to 6 hours as needed
Maximum daily dose of paracetamol: 4000 mg (4g) from all sources
Dosing intervals and maximums must be adjusted based on the specific active pharmaceutical ingredient combined with paracetamol

Pediatric Dosing

Paracetamol component: 10 mg/kg to 15 mg/kg orally every 4 to 6 hours as needed
Maximum daily dose: 75 mg/kg/day up to a maximum adult dose, depending on age and weight
Combination products are generally contraindicated in young children due to risks of toxicity from co-formulated agents

Indications

Short-term management of mild to moderate acute pain (e.g., headache, musculoskeletal pain, postoperative pain)
Management of pyrexia (fever)
Synergistic pain relief via multimodal mechanisms from co-formulated active ingredients

Mechanism of Action

Paracetamol acts centrally by inhibiting prostaglandin synthesis via weak COX-1 and COX-2 inhibition and modulation of descending serotonergic pathways
Co-formulated agents (e.g., opioids, NSAIDs, caffeine) provide complementary pharmacodynamic actions such as central mu-opioid receptor agonism or peripheral cyclooxygenase inhibition

Contraindications

Severe hepatic impairment or active hepatic disease
Known hypersensitivity to paracetamol or any co-formulated active ingredient
Chronic heavy alcohol use (due to increased hepatotoxicity risk)
Specific contraindications dictated by the accompanying combination drug (e.g., opioid dependency, asthma for NSAIDs)

Adverse Reactions

Nausea, dyspepsia, and gastrointestinal upset
Dizziness, sedation, and lightheadedness (frequently due to centrally acting combination agents)
Severe hepatotoxicity and acute liver failure in overdose
Rare hypersensitivity reactions including severe cutaneous adverse reactions (SJS, TEN)

Drug Interactions

Alcohol: Increases risk of hepatotoxicity
Warfarin: Chronic high-dose paracetamol may increase bleeding risk
CYP3A4/CYP2D6 inhibitors or inducers may alter the metabolism of co-formulated opioids or adjuncts
Enzyme inducers (e.g., isoniazid, rifampin, phenytoin) increase the formation of toxic paracetamol metabolites

Curated Content: Needs Vetting Before Put to Clinical Use