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What Factors Affect Paracetamol Dosage?

Tricia Christensen
By
Updated May 17, 2024
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The factors affecting acetaminophen or paracetamol dosage are age, weight, and the guidelines for a safe maximum dose. Sometimes the recommended amount is also influenced by medical conditions. Additionally, indications for paracetamol dosage are based on the length of consistent use, and after a certain span of days, a doctor’s guidance should be sought if the drug is still necessary.

Emphasis is placed on the maximum safe paracetamol dosage because taking too much of the drug can cause irreparable liver damage. The medication is not beneficial in amounts higher than those recommended. In fact, it can be extremely harmful, and it's therefore important to never take more than is advised.

The recommended amount in children under 12 is determined most by weight. Very young babies weighing between six and 11 pounds (2.72-4.99 kg) can take 40 milligrams (mg) every six hours, but should not exceed 200 mg in a day. The basic formula for pediatric dosage is described as 10-15 mg of the medication for each kilogram of the child’s weight.

Sometimes paracetamol dosage guidelines on medication packaging will be assessed by age instead. This may prove easier to understand than converting weight to dose. arents with children who are smaller than average may still want to use the weight conversion formula. Conversely, a child with a heavier build should have his or her dose assessed based on age.

Paracetamol dosage instructions are generally the same for adults and children over age 12. Parents are sometimes advised to lower the dose or use the lowest possible effective amount. Presently, the safe dose is thought to be from 650-1000 mg, every four to six hours. In a day, a patient should never exceed the recommended daily maximum of 4000 mg, which is equivalent to four 1000 mg doses.

It makes a difference if extra strength paracetamol pills are used, as these are typically 500 mg each. When patients take two 500 mg pills at a time, they need to wait for six-hour intervals between doses, to avoid using too much. On the other hand, patients with 325 mg pills may take two every four hours around the clock. By doing this, they’ll ingest 3900 mg per day, which is under the recommended daily maximum. There may also be different paracetamol dosage recommendations for extended release forms of the drug.

Since paracetamol is processed in the liver and can cause damage to this organ, there may be differing dosage instructions for people who are chronic drinkers, alcoholics, or who have other forms of hepatic impairment. Those who plan to drink heavily are advised against using any acetaminophen. Minor hepatic impairment might require a reduction in paracetamol dosage. Patients with any form of liver disease should discuss with a doctor whether the medication is appropriate.

Paracetamol dosage also includes directions for maximum days of use. In adults, this is about ten days. Those taking the drug for longer need to talk to their physicians about guidelines for continuing the medication beyond this point.

WiseGEEK is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Tricia Christensen
By Tricia Christensen , Writer
With a Literature degree from Sonoma State University and years of experience as a WiseGEEK contributor, Tricia Christensen is based in Northern California and brings a wealth of knowledge and passion to her writing. Her wide-ranging interests include reading, writing, medicine, art, film, history, politics, ethics, and religion, all of which she incorporates into her informative articles. Tricia is currently working on her first novel.

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Tricia Christensen

Tricia Christensen

Writer

With a Literature degree from Sonoma State University and years of experience as a WiseGEEK contributor, Tricia...
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