Can You Cut Aller-Flex 180 mg (Kirkland Fexofenadine Hydrochloride Tablets) In Half?

In our latest question and answer, the pharmacist discusses whether or not you can split Kirkland brand fexofenadine (Aller-Flex) in half.


Can I cut Aller-Flex 180 mg (Kirkland Fexofenadine Hydrochloride Tablets)?

Asked by Sor On May 21, 2021

Answered by
Medical Content Reviewed By HelloPharmacist Staff

Published May 21, 2021
Last updated Mar 03, 2022

Key points

  • Fexofenadine is an immediate release antihistamine. It is safe to cut in half.
  • In general, unless it’s an extended release, delayed release, or specially coated medication, it’s usually safe to cut in half.
  • While it might be ok to crush or cut, 90mg is not a typical dose. A normal adult dose is 180mg, so 90mg might not resolve your allergies.

Hi Sori and thanks for reaching out to us. I appreciate you asking. I sometimes find out after the fact that my patients have cut a medication in half which can potentially be unsafe. 

Fexofenadine (or by the brand name, Allegra) is a non drowsy (for most people) antihistamine that is usually taken once a day to help treat seasonal allergies. It is perfectly safe to cut your fexofenadine 180mg tablet in half.

In general, as long as the tablet  doesn’t say extended release, delayed release, or specifically not to cut them, it’s usually safe to cut these medications in half. However, exceptions do exist, so please continue to double check for each individual medication.

There are two different recommended doses for adults taking fexofenadine for allergies. They are 60mg twice daily or the much more common 180mg once daily. If you cut the 90mg dose in half, you are taking a dose that isn’t approved to treat allergies. If you are planning on only taking 90mg once daily, then it probably won’t treat your allergies properly. 

I hope this helps! Feel free to write us again in the future.


  • Allegra Prescribing Information, FDA
  • Do not crush list 2020, ISMP

About the Pharmacist

Dr. Brian Staiger, PharmD

Dr. Brian has been practicing pharmacy for over 11 years and has wide-ranging experiences in many different areas of the profession. From retail, clinical and administrative responsibilities, he's your knowledgeable and go-to source for all your pharmacy and medication-related questions! Feel free to send him an email at! You can also connect with Dr. Brian Staiger on LinkedIn.

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