Medication for fever
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antipyretic medications fever treatment
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 647
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Medications for Fever (Antipyretics)
Antipyretics work by reducing the elevated hypothalamic set point and facilitating heat loss. They also relieve associated symptoms like headache, myalgias, and arthralgias (Harrison's Principles of Internal Medicine, 21st Ed., p. 647).
First-Line Antipyretics
| Medication | Class | Typical Adult Dose | Notes |
|---|---|---|---|
| Paracetamol (Acetaminophen) | Analgesic/Antipyretic | 500–1000 mg every 4–6 hrs (max 4 g/day) | Safest overall; preferred in pregnancy, liver disease caution |
| Ibuprofen | NSAID | 200–400 mg every 4–6 hrs (max 1200 mg/day OTC) | Effective antipyretic + anti-inflammatory; avoid in renal impairment, GI ulcers |
| Aspirin | NSAID/Salicylate | 325–650 mg every 4–6 hrs | Avoid in children (Reye's syndrome risk); avoid in pregnancy |
| Naproxen | NSAID | 220–440 mg every 8–12 hrs | Longer duration of action |
| Diclofenac | NSAID | 50 mg every 8 hrs | Available as oral/suppository/IV |
Route of Administration
- Oral – Most common (tablets, syrup for children)
- Rectal (suppository) – Used when oral route is not possible (vomiting, altered consciousness)
- Intravenous – Paracetamol IV or Ibuprofen IV used in hospitalized patients
Special Populations
| Population | Preferred Agent | Agents to Avoid |
|---|---|---|
| Children | Paracetamol, Ibuprofen (>6 months) | Aspirin (Reye's syndrome) |
| Pregnant women | Paracetamol (all trimesters) | NSAIDs (especially 3rd trimester) |
| Renal impairment | Paracetamol | NSAIDs |
| Liver disease | Low-dose Paracetamol (use caution) | High-dose Paracetamol, NSAIDs |
| GI ulcer/bleed risk | Paracetamol | NSAIDs (or use with PPI if necessary) |
Key Points
- Paracetamol is the most universally safe and widely recommended antipyretic.
- NSAIDs (ibuprofen, naproxen) provide additional anti-inflammatory effects, beneficial when fever is due to inflammation.
- Aspirin is largely reserved for adults; contraindicated in children and teenagers with viral illness.
- Alternating paracetamol and ibuprofen is a common clinical practice in children with high/persistent fever, though evidence for superiority over monotherapy is modest.
- Treating the underlying cause of fever (e.g., antibiotics for bacterial infection) is equally important alongside antipyretic therapy.
⚠️ Always consult a healthcare provider for persistent fever (>3 days), very high fever (>39.5°C/103°F), or fever in infants under 3 months.
Medication for fever
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antipyretic medications fever treatment paracetamol ibuprofen aspirin
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 647
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fever management special populations children pregnancy renal disease
Implementing an Antibiotic Stewardship Program
Page 5
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Medications for Fever (Antipyretics)
Antipyretics reduce the elevated hypothalamic set point and help relieve associated symptoms such as headache, myalgias, and arthralgias (Harrison's, 21st Ed., p. 647).
First-Line Antipyretics
| Medication | Class | Typical Adult Dose | Notes |
|---|---|---|---|
| Paracetamol (Acetaminophen) | Analgesic/Antipyretic | 500–1000 mg every 4–6 hrs (max 4 g/day) | Preferred agent; safest across most populations |
| Ibuprofen | NSAID | 200–400 mg every 4–6 hrs (max 1200 mg/day OTC) | Effective + anti-inflammatory; avoid in GI/renal issues |
| Aspirin | Salicylate/NSAID | 325–650 mg every 4–6 hrs | Adults only; affects platelets and GI tract |
| Naproxen | NSAID | 220–440 mg every 8–12 hrs | Longer acting NSAID option |
| Diclofenac | NSAID | 50 mg every 8 hrs | Available oral, rectal, and IV forms |
Acetaminophen is preferred over aspirin and NSAIDs because oral aspirin and NSAIDs can adversely affect platelets and the gastrointestinal tract (Harrison's, 21st Ed., p. 647).
Routes of Administration
- Oral – Standard route (tablets, syrups)
- Rectal suppositories – When oral route is unavailable (e.g., vomiting)
- Parenteral (IV) – For hospitalized patients who cannot take oral medications (Harrison's, 21st Ed., p. 647)
Special Populations
| Population | Preferred Agent | Avoid |
|---|---|---|
| Children | Paracetamol; Ibuprofen (>6 months) | Aspirin — risk of Reye's syndrome |
| Pregnant women | Paracetamol | NSAIDs (especially 3rd trimester) |
| Renal impairment | Paracetamol | NSAIDs |
| GI ulcer/bleed | Paracetamol | NSAIDs (or add PPI if unavoidable) |
| Liver disease | Paracetamol (low dose, with caution) | High-dose Paracetamol |
In children specifically, aspirin must be avoided as it increases the risk of Reye's syndrome — acetaminophen or ibuprofen are the appropriate choices (Harrison's, 21st Ed., p. 647).
Key Clinical Points
- Treating the underlying cause of fever is as important as antipyretic therapy (e.g., antibiotics for bacterial infection).
- Alternating paracetamol and ibuprofen is practiced in persistent childhood fever, though evidence for superiority over single-agent therapy is limited.
- Paracetamol is the most universally safe and widely recommended antipyretic across age groups.
⚠️ Seek medical attention for fever >39.5°C (103°F), fever lasting more than 3 days, or any fever in infants under 3 months of age.
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