💊 Fever‑Reducing Medications for Adults: Doses, Timing, and Safety

When a fever makes you feel miserable, the medicine cabinet is often the first place you turn. But knowing exactly which pill to take, how much, and how often can be confusing — and mistakes can be dangerous. Dr. Ravi Sishir Reddy provides a straightforward guide to the most common fever‑reducing medications available in India, including correct adult dosages, maximum limits, timing, and the specific situations in which each should be avoided.

1. Paracetamol (Acetaminophen) – The Safest First Choice

Paracetamol is the most widely recommended first‑line antipyretic for adults. It acts on the brain's temperature‑regulating centre to lower fever and also relieves mild to moderate pain.

• Common brands in India: Crocin, Calpol, Dolo 650, Pacimol, Sumo L.
• Usual adult dose: 500‑650 mg every 6‑8 hours.
• Maximum daily dose: 3,000‑4,000 mg (3‑4 g) per 24 hours. In people with liver disease, malnutrition, or heavy alcohol consumption, the maximum is often reduced to 2,000 mg per day. Never exceed the labelled dose.
• Onset of action: Begins to lower fever within 30‑60 minutes; peak effect at 2‑3 hours.
• Duration: 4‑6 hours.
• Take with or without food: Paracetamol does not irritate the stomach and can be taken on an empty stomach.
• Main risk: Overdose — taking more than 7‑10 grams at once or exceeding the daily limit for several days — can cause severe, potentially fatal liver damage. Early symptoms of overdose include nausea, vomiting, and abdominal pain, but severe liver injury may not be apparent for 24‑48 hours. If you suspect an overdose, go to the emergency room immediately, even if you feel well.

2. Ibuprofen – Anti‑Inflammatory Power for Body Aches

Ibuprofen is a non‑steroidal anti‑inflammatory drug (NSAID) that reduces fever, pain, and inflammation. It is particularly useful when a fever is accompanied by significant body aches, joint pain, or a sore throat.

• Common brands in India: Brufen, Combiflam (also contains paracetamol — be careful with double‑dosing), Ibugesic, Flexon.
• Usual adult dose: 200‑400 mg every 6‑8 hours.
• Maximum over‑the‑counter daily dose: 1,200 mg per day. Higher doses (up to 2,400 mg) are sometimes prescribed for inflammatory conditions but should only be taken under medical supervision.
• Onset of action: 30‑60 minutes; peak effect at 1‑2 hours.
• Duration: 6‑8 hours.
• Always take with food or a glass of milk to reduce stomach irritation.
• Main risks: Gastritis, stomach ulcers, and gastrointestinal bleeding. Ibuprofen also reduces blood flow to the kidneys and should be avoided if you are dehydrated, have chronic kidney disease, or are on diuretics or certain blood pressure medications (ACE inhibitors/ARBs). Long‑term use increases cardiovascular risk. It is also avoided in dengue fever due to the risk of worsening bleeding.

3. Mefenamic Acid – When Pain and Fever Are Both Strong

Mefenamic acid is another NSAID, often used for fever accompanied by moderate to severe pain — such as severe body aches, headache, or menstrual cramps. It is generally not the first choice for uncomplicated fever.

• Common brands in India: Meftal, Mefkind, Ponstan, Mefanorm.
• Usual adult dose: 250‑500 mg every 8 hours.
• Maximum daily dose: 1,500 mg per day. Treatment is usually limited to a maximum of 7 days.
• Take with food or milk.
• Main risks: Similar to ibuprofen — stomach irritation, kidney impairment, and an increased risk of bleeding. Mefenamic acid has been associated with a slightly higher risk of seizures in overdose or in susceptible individuals. It is not a first‑line antipyretic and should be used only when paracetamol or ibuprofen are insufficient or contraindicated.

4. Aspirin (Acetylsalicylic Acid) – Rarely Used for Fever Today

Aspirin is an effective antipyretic and anti‑inflammatory drug, but it is no longer recommended for routine fever management in adults due to its side effect profile and the availability of safer alternatives.

• Usual adult dose (if used): 300‑600 mg every 4‑6 hours. Maximum 4,000 mg per day.
• Main risks: Stomach ulcers and bleeding, tinnitus (ringing in the ears) at higher doses, and Reye's syndrome in children (never give aspirin to a child with fever). Aspirin also increases bleeding risk and is generally avoided in dengue and other hemorrhagic fevers.
• Current use: Primarily used in low doses (75‑150 mg) for cardiovascular protection (heart attack and stroke prevention), not as a fever reducer.

Dr. Reddy's advice: unless your doctor specifically recommends aspirin for a particular condition, use paracetamol or ibuprofen instead for fever.

5. Practical Tips for Taking Antipyretics Safely

• Never exceed the recommended dose or shorten the dosing interval. More is not better; it only increases the risk of side effects.
• Check combination products carefully. Many cold and flu remedies contain paracetamol. Taking them along with a separate paracetamol tablet can lead to an accidental overdose. Always read the ingredients.
• Don't double‑dose if you miss a dose. If you forget a dose, take it as soon as you remember, but if it is almost time for the next dose, skip the missed one.
• If the fever is not coming down at all after 2‑3 doses, consult a doctor. A fever that does not respond to antipyretics may indicate a more serious underlying infection.
• Drink plenty of water. Dehydration can make medications less effective and increase the risk of kidney damage from NSAIDs.
• Do not take NSAIDs (ibuprofen, mefenamic acid, aspirin) if you suspect you have dengue — these can increase the risk of severe bleeding. Use only paracetamol.
• If you are pregnant, paracetamol is the only antipyretic considered safe for short‑term use at the lowest effective dose. Avoid all NSAIDs, especially in the third trimester.