What does as needed mean on a prescription?

When a prescription states “as needed,” it means a person should only take the medication when experiencing certain symptoms, rather than taking it every day on a strict schedule. This is known as a “PRN” medication, which stands for the Latin phrase “pro re nata”, meaning “as the thing is needed”.

Doctors prescribe PRN medications to help people manage symptoms that come and go, such as pain, trouble sleeping, agitation, or an asthma attack.

Unlike daily medications, such as those for high blood pressure or diabetes, that must be taken regularly, PRN medications are mostly meant for fast symptom relief rather than treating the underlying disease. By using them this way, people only put the medication into their bodies when it is actually necessary.

To take a PRN medication safely, follow the rules on the label. A PRN prescription must clearly state the drug’s name, the correct dose, and how to take it. It must also state the minimum time a person must wait between doses and the maximum amount they can take within a 24-hour period.

A person can record the exact time they take each dose so they do not accidentally take another one too soon.

People should check with a pharmacist if they use multiple medications. Many over-the-counter and prescription PRN drugs share common ingredients, like acetaminophen. Taking several of these at the same time could result in an overdose.

^{Disclaimer: While Medical News Today strives for factual, comprehensive, and current information, this article is not a substitute for a licensed healthcare professional’s expertise. Always consult a doctor before taking or discontinuing any medication. Drug information is subject to change and may not cover all uses, directions, precautions, warnings, interactions, reactions, or adverse effects. The lack of a warning does not guarantee a drug’s safety, effectiveness, or appropriateness for all patients or specific uses. Learn more about our approach to content integrity.}

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