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Antipyretic – Fever-Reducing Medications Explained

An antipyretic is a medication used to reduce fever and lower elevated body temperature. Common examples include paracetamol and ibuprofen.

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An antipyretic is a medication used to reduce fever and lower elevated body temperature. Common examples include paracetamol and ibuprofen.

What is an Antipyretic?

An antipyretic is a type of medication used to reduce fever (elevated body temperature). The term comes from the Greek words anti (against) and pyretos (fever). Antipyretics are among the most widely used medications in the world and are frequently available over the counter at pharmacies.

Fever is a natural immune response to infections or inflammation and is clinically defined as a body temperature above 38.0 °C (100.4 °F). Antipyretics work by interfering with the mechanisms that cause fever and help restore normal body temperature.

Mechanism of Action

Fever is triggered when the body releases signaling molecules called pyrogens, particularly prostaglandin E2, which act on the hypothalamus – the temperature-regulating center of the brain – and raise the temperature set point.

Most antipyretics, including paracetamol (acetaminophen), ibuprofen, and aspirin (acetylsalicylic acid), work by inhibiting the enzyme cyclooxygenase (COX), which is responsible for producing prostaglandins. By reducing prostaglandin synthesis, these medications lower the temperature set point back to normal, thereby reducing fever.

Indications

Antipyretics are used in the following situations:

Fever from various causes such as infections, colds, or influenza
Post-vaccination fever reduction
Prevention or treatment of febrile seizures in children
Fever associated with autoimmune or oncological conditions

Key Active Substances

Paracetamol (Acetaminophen)

Paracetamol is one of the most commonly used antipyretics. It reduces fever and relieves mild to moderate pain but has little to no anti-inflammatory effect. It is generally well tolerated, but overdose can cause serious liver damage and must be avoided.

Ibuprofen

Ibuprofen belongs to the class of nonsteroidal anti-inflammatory drugs (NSAIDs). It provides antipyretic, analgesic (pain-relieving), and anti-inflammatory effects. It is suitable for adults and children above a certain body weight but should be used with caution in individuals with stomach sensitivity or kidney disease.

Acetylsalicylic Acid (Aspirin)

Aspirin also acts as an antipyretic, analgesic, and anti-inflammatory agent. It should not be given to children under 12 years of age due to the risk of Reye syndrome, a rare but potentially life-threatening condition.

Metamizole (Dipyrone)

Metamizole is a potent antipyretic and analgesic used particularly in cases of high fever or severe pain. In some countries it is prescription-only because it can rarely cause agranulocytosis – a dangerous reduction in white blood cells.

Dosage and Administration

Dosage of antipyretics depends on age, body weight, and the specific substance. General guidelines include:

Paracetamol for adults: typically 500–1000 mg per dose, maximum 4000 mg per day
Ibuprofen for adults: typically 200–400 mg per dose, maximum 1200 mg per day without medical supervision
For children, always use weight-adjusted dosing
Antipyretics should not be used for more than 3 days without consulting a healthcare professional

Side Effects

Depending on the substance, side effects may include:

Paracetamol: Liver damage in cases of overdose; rarely allergic reactions
Ibuprofen: Gastric irritation, peptic ulcers, kidney dysfunction, increased cardiovascular risk with long-term use
Aspirin: Gastrointestinal bleeding, allergic reactions, Reye syndrome in children
Metamizole: Agranulocytosis (rare but life-threatening), drop in blood pressure

When to See a Doctor

Medical attention should be sought in the following situations:

Fever above 39.5 °C (103.1 °F) or lasting more than 3 days
Fever in infants under 3 months of age
Fever combined with stiff neck, skin rash, or severe headache
Fever in immunocompromised individuals or those with chronic conditions
No response to the antipyretic medication

References

World Health Organization (WHO) – Model Formulary 2023: Antipyretics and analgesics. Geneva: WHO Press.
Brunton LL, Hilal-Dandan R, Knollmann BC – Goodman & Gilman's The Pharmacological Basis of Therapeutics. 13th edition. McGraw-Hill Education, 2018.
Dinarello CA, Porat R – Pathophysiology and treatment of fever in adults. UpToDate, 2023.

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