Can You Split Toprol XL Tablets?

In our latest question and answer, the pharmacist discusses whether or not your can safely split Toprol XL (metoprolol extended-release) tablets.


My doc prescribed me 25 mg Toprol XL. I am really nervous about how it may affect my heart rate. Is there any harm in splitting it and taking only 12.5 mg for the first few days to feel it out? The tablets are scored.

Asked by Megan On May 23, 2019

Answered by
Medical Content Reviewed By PharmacistAnswers Staff

On May 24, 2019
White Scored Tablet With Text - Splitting Toprol XL


Yes, Toprol XL (metoprolol extended-release) tablets can be split, which is quite an uncommon characteristic for extended-release products in general.

For most products that have some sort of extended or delayed-release property, splitting or crushing them destroys this mechanism, causing the entire dose of the drug to be released at once.[1]

This not only ruins the intended effect of the medication (to release the active ingredient over time), it can greatly increase the risk of side effects.

Take for example Oxycontin, which slowly releases the potent opioid drug oxycodone, over a period of 12 hours.[2]

Crushing or splitting the tablets will cause the entire dose to be delivered all at once, which could cause serious complications including euphoria, respiratory depression, and in serious cases, death.

Fortunately, Toprol XL has a unique extended-release mechanism which allows the tablets to release metoprolol over time, even if they are split.

In fact, as you have mentioned, the tablets are scored, to facilitate splitting if your doctor recommends you do so.

In regard to Toprol XL lowering heart rate, it certainly has that effect on most people.

The prescribing information states an average reduction of heart rate (beats per minute) of 9 to 27, depending on dose, for adults. For children, the reduction in heart rate averages between 5 and 7 beats per minute, although this can vary by individual.[3]

If you are concerned with a drop in heart rate while on Toprol, talk to your doctor first before adjusting your dose.

25mg is the recommended starting dose for many indications (such as high blood pressure), but there are certain factors where a lower starting dose may be warranted (e.g. in those with an already low heart rate or liver impairment).

So, yes the tablets can be split, but speak with your doctor first about doing so.

Toprol XL Release-Mechanism

Toprol XL tablets contain numerous 'controlled-release' pellets of the active ingredient metoprolol, evenly distributed inside.

Each 'controlled-release' pellet acts as a separate drug delivery unit, and since they are evenly distributed, splitting the tablets do not have an effect on the extended-release properties overall.[4]

It is important to note that Toprol XL tablets should not be crushed. Crushing the tablets will destroy the individual pellets, and ruin the extended-release properties of the drug.

Cross section of Toprol XL tablet


Toprol XL (metoprolol extended-release) tablets can safelty be split without ruining the extended-release mechanism of the drug and are scored to assist in doing so. However, be sure to speak with your doctor first before adjusting your dose.

  1. ^ Drug Formulation Advances in Extended-Release Medications for Pain Control. PubMed
  2. ^ Oxycontin Prescribing Information. AccessFDA
  3. ^ Toprol XL Prescribing Information. AccessFDA
  4. ^ Efficacy and safety of extended-release metoprolol succinate in hypertensive children 6 to 16 years of age: a clinical trial experience. PubMed

About the Pharmacist

Dr. Brian Staiger Pharm.D

Dr. Brian Staiger is a licensed pharmacist in New York State and the founder of He graduated from the University At Buffalo with a Doctor of Pharmacy degree in 2010. He has been featured in numerous publications including the Huffington Post as well as a variety of health and pharmacy-related blogs. Please feel free to reach out to him directly if you have any inquiries or want to connect! He's answered thousands of medication and pharmacy-related questions and he's ready to answer yours! Office: 716-389-3076

Recent Questions