Can You Cut Tylenol PM In Half?

In our latest question and answer, the pharmacist discusses whether or not it is safe to cut Tylenol PM in half.

3 min read Updated Jun 2026 13,328 views
Can You Cut Tylenol PM In Half?
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Frostie asked

Can you cut a Tylenol PM (or generic acetaminophen/diphenhydramine) caplet in half?

May 31, 2021
The quick answer
  • Tylenol PM tablets can be cut in half safely, but liquid gel capsules should not be cut because they would be messy and you couldn't measure an accurate dose.
  • Tylenol PM is only recommended for occasional use, and using diphenhydramine regularly for sleep is not effective long-term and has been linked to dementia risk.
  • If you're having ongoing sleep problems, improving your sleep habits like avoiding phones and screens before bed may help more than medication.
A quick summary of Dr. Brian Staiger, PharmD's full answer below, condensed by AI from that answer only (not from any outside source). The pharmacist's answer is the source of record.
Medications in this answer — tap to explore

asking. It safe to cut your Tylenol PM in half but there are drawbacks to doing so (and whether or not you should depends on the specific formulation in question).

Some formulations of Tylenol PM may have a capsule-like coating that allows the tablet to be swallowed easier. If this is broken, it might be more difficult to swallow, but it is still fine to cut in half and the medication will work the same way (again, it just may not be as easy to swallow).

However, Tylenol PM is also available as a liquid gel-filled capsule and then these should not be cut. Not only would they be messy, but you wouldn’t really be able to measure out half of a dose with any accuracy.

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.

Regarding Tylenol PM, it might not be the best option for you to help with sleep long term.

Tylenol PM is a combination drug containing acetaminophen and diphenhydramine. It is recommended to take for occasional trouble sleeping and if you have minor aches or pains. If you are only having trouble sleeping on occasion, then plain diphenhydramine (the ingredient in Tylenol PM that causes drowsiness) may be a more appropriate option.

If you are using diphenhydramine regularly to help you fall asleep, it’s not an effective long term strategy. It hasn’t been shown to help with sleep quality beyond a few nights.

Also, recently, long term use has been linked to developing dementia later in life. If you find that your sleep quality isn’t the best, it might be a good time to reevaluate your sleep hygiene. There’s a lot involved in sleep hygiene, and I will link you to a good resource if you’d like to read up on it more.

From personal experience, I know that making sure that I don’t use my phone or watch any TV for an hour or so before bedtime helps. Bright lights like phones and your TV cause your brain to think that it’s daytime, so you tend to have a more difficult time falling asleep. Instead, I try to read a bit to decompress before I fall asleep. There’s always something that can be done to improve your sleep hygiene. I would encourage you to read up on it a bit and give it a try.

Lastly, if you’ve made sleep hygiene adjustments, and still are struggling to fall asleep, I would reach out to your physician about trying an alternative sleep medication.

Feel free to reach out to us if you have any additional questions!

References & sources
  1. Diphenhydramine Prescribing Information — FDA
  2. Do not crush list 2020 — ISMP
  3. Tylenol PM Product Information Page — Tylenol
  4. Over-the-Counter Agents for the Treatment of Occasional Disturbed Sleep or Transient Insomnia: A Systematic Review of Efficacy and Safety — The Primary Care Companion for CNS Disorders
Glossary — Terms in This Answer
Extended release
A medication formulation designed to release the drug slowly over a longer period of time rather than all at once.
Delayed release
A medication formulation that is designed to release the active ingredient after it passes through a certain part of the digestive system.
Acetaminophen
A common over-the-counter pain reliever and fever reducer found in many medications including Tylenol.
Diphenhydramine
An antihistamine ingredient that causes drowsiness and is commonly used to help with sleep.
Dementia
A group of conditions involving decline in mental abilities such as memory and thinking, typically occurring in older adults.
Sleep hygiene
A set of practices and habits that help you fall asleep more easily and sleep better throughout the night.
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Dr. Brian Staiger, PharmD
About the pharmacist

Dr. Brian Staiger, PharmD

Clinical Pharmacy

Doctor of Pharmacy, board certified clinical pharmacist (BCPS), American Herbalist Guild, Medication Therapy Management certified

Brian Staiger, PharmD, BCPS, is a licensed pharmacist with more than 13 years of experience across retail pharmacy, clinical pharmacy, medication safety, pharmacy program development, and healthcare administration. He is the founder of HelloPharmacist.com, where he helps patients...

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