Singulair® Lawsuits

First approved in 1998, montelukast is a prescription asthma and allergy medication marketed under the brand name Singulair®. Because of how Singulair works, however, it may cause serious neuropsychiatric injuries or mental health side effects — and the risk may be greater in children taking Singulair than adults.

If you or a loved one took Singulair and experienced mental health side effects, you may be entitled to compensation from a Singulair lawsuit.

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FDA Warns of Singulair Mental Health Side Effects

In March 2020, the U.S. Food and Drug Administration (FDA) announced it was strengthening existing warnings about the risk of neuropsychiatric events (or mental health side effects) associated with the prescription drug montelukast, which is sold under the brand name Singulair.

The FDA added its most prominent boxed warning to the drug label to both:

  • Warn consumers of the neuropsychiatric side effects of Singulair
  • Recommend that Singulair only be used to treat allergic rhinitis (hay fever) in patients who cannot be effectively treated with other allergy medications

While the label had already included warnings about potential mental health side effects, many health care providers and patients alike were not aware of these risks because they were not displayed prominently.

What Is Singulair?

Available as tablets, chewable tablets, and oral granules, montelukast (Singulair) is a prescription medication approved to:

  • Prevent asthma attacks in patients 1 year and older
  • Be a long-term treatment option for asthma in adults and children 1 year and older
  • Prevent exercise-induced asthma in patients 6 years and older
  • Relieve symptoms of seasonal allergic rhinitis (or seasonal outdoor allergies) in patients 2 years of age and older
  • Relieve symptoms of perennial allergic rhinitis (or year-round indoor allergies) in patients 6 months and older
  • Help control symptoms of allergic rhinitis (or hay fever), such as sneezing, stuffy or runny nose, and nose itchiness

However, the use of Singulair has been linked to severe mental health side effects, ranging from anxiety and depression to suicidal thoughts and actions.

Singulair Side Effects

Montelukast (Singulair) has been linked to numerous neuropsychiatric events or mental health side effects, including:

  • Agitation, aggressive behavior, and hostility
  • Anxiety
  • Attention problems
  • Bad or vivid dreams
  • Depression
  • Disorientation or confusion
  • Hallucinations
  • Insomnia
  • Memory problems
  • Obsessive-compulsive symptoms
  • Stuttering
  • Suicidal thoughts and suicide
  • Tics and tremors
  • Uncontrolled muscle movements

If you or your loved one suffer from any of these side effects of montelukast (Singulair), you may be eligible to take legal action to pursue financial compensation.

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You may be eligible for compensation. We may be able to help.

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Singulair Class Action Lawsuits

At least 14 Singulair lawsuits have been filed since August 2020. Generally drug cases are handled individually, not as class actions. As of 2021, 10 of these cases were pending in court.

These Singulair lawsuits claim that:

  • Victims developed neuropsychiatric injuries as a result of taking Singulair
  • Singulair crosses the blood-brain barrier and causes these mental health side effects
  • The neuropsychiatric risks of the drug are greater for children than adults
  • Drug manufacturer Merck knew, or should have known, of these risks before it began selling Singulair
  • Singulair warnings before March 2020 were grossly insufficient in regard to neuropsychiatric events

Am I Eligible to File a Singulair Lawsuit?

You may be eligible to file a Singulair lawsuit if you or a loved one:

  • Took Singulair (montelukast)
  • Experienced tics, tremors, stuttering, or mental health side effects as a result

Not sure about your options? Tell us a little bit more about what’s going on by calling (800) 995-1212 or filling out our contact form, and a member of our team will be in touch right away.

How to File a Singulair Lawsuit

If you or your loved one took Singulair asthma medicine and experienced mental health side effects as a result, you may be able to pursue financial compensation through a Singulair lawsuit — and Sokolove Law may be able to help.

When you work with us, our attorneys can handle every step of the legal process for you, so you can focus on your health and your loved ones during this difficult time.

While every case is different, the lawsuit process usually involves your legal team:

  • Determining your eligibility to file a Singulair (montelukast) lawsuit
  • Gathering evidence to support your claim
  • Filing your Singulair lawsuit against the drug manufacturer
  • Pursuing compensation through a Singulair settlement or jury verdict

Learn More About Your Options

If you took Singulair and experienced side effects, an attorney with Sokolove Law can help you understand your legal options.

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What to Look for in a Singulair Lawyer

Filing a Singulair lawsuit can be difficult without the right legal representation on your side, but choosing a lawyer for your Singulair claim can be difficult if you don’t know what to look for.

When it comes to finding a lawyer who has the resources to handle your case, be sure to look for a Singulair law firm that can offer you:

  • A Free Case Review: Don’t keep wondering if you can take legal action over what happened to you. Get a free case review today to see if you have a case.
  • Decades of Experience: Sokolove Law has been helping injured clients pursue compensation for over 40 years.
  • National Reach: Sokolove Law is a national law firm with an office and licensed attorney in almost every state. We’ve helped clients nationwide get the results they deserve.
  • A Proven Track Record of Success: We’ve recovered over $1.5 Billion on behalf of our clients injured by dangerous drugs and medical devices.
  • Legal Help at No Out-of-Pocket Cost: Our attorneys work on a contingency basis, which means they only get paid if you do. There are no upfront costs to work with us.

Get Skilled Help from a Singulair Law Firm

If you suffered from anxiety or depression or if your loved one committed suicide after taking Singulair asthma medicine, you may be eligible for compensation from a Singulair lawsuit — and we may be able to help.

Over the last 40 years, Sokolove Law has secured over $1.5 Billion from dangerous drug and medical device lawsuits on behalf of our clients nationwide. Our Singulair lawyers have the resources and reach needed to build your case and fight for as much compensation as possible in your case — at no out-of-pocket cost to you.

Get a free case review or call (800) 995-1212 to learn more about your potential legal options.

Singulair (Montelukast) Lawsuit FAQs

Is montelukast Singulair? 

Singulair is the brand name for the prescription asthma and allergy medication montelukast.

Who makes Singulair?

Montelukast (sold under the brand name Singulair) is manufactured by Merck & Co. Inc.

How long do I have to file a Singulair lawsuit?

Because of state laws called statutes of limitations, you only have so long to take legal action over the Singulair side effects you experienced. Once this deadline passes, you won’t have the opportunity to hold the drug manufacturer accountable by filing a Singulair lawsuit again. Get started on the process today by contacting Sokolove Law.

Do I need a lawyer to file a Singulair lawsuit?

Without experienced legal help, filing a Singulair lawsuit can be an overwhelming process, especially if you may already be dealing with the medication’s side effects. Sokolove Law may be able to help.

When you work with us, we can handle every step of the legal process for you, from gathering the evidence to filing the lawsuit — at no out-of-pocket cost to you.

Get a free case review today to learn more about your legal options.

How much do lawyers for a Singulair (montelukast) lawsuit cost?

There are no upfront or out-of-pocket fees to work with Sokolove Law. Our attorneys work on a contingency basis, which means they only get paid if your case results in compensation. See if you have a Singulair case we may be able to help with today.

What are side effects of Singulair (montelukast)? 

Singulair has been linked to serious behavior and mood-related changes, including the following side effects:

  • Agitation, aggressive behavior, and hostility
  • Anxiety and depression
  • Attention problems, disorientation, or confusion
  • Bad or vivid dreams
  • Hallucinations
  • Insomnia or difficulty sleeping
  • Memory problems
  • Obsessive-compulsive symptoms
  • Stuttering
  • Suicidal thoughts and suicide
  • Tics and tremors
  • Uncontrolled muscle movements

If you took montelukast (Singulair) and experienced any of these side effects, you may be able to file a Singulair lawsuit. Contact Sokolove Law today to learn more.

How long do side effects last after stopping Singulair?

The side effects of Singulair and how long they last can vary from person to person. Some patients reported that their Singulair side effects resolved after stopping the medication, though that’s not always the case. The FDA has received reports of the side effects developing or continuing even after stopping Singulair.

If you or your loved one took Singulair and are experiencing mental health side effects, you may be able to pursue compensation through a Singulair lawsuit. Contact Sokolove Law today to learn more about your legal rights and options.

Can Singulair cause tics, tremors, or stuttering?

Yes — Singulair can cause a range of mental health and behavior-related changes, including tics, tremors, and stuttering. If you experienced tics, tremors, or stuttering while taking Singulair, you may be entitled to compensation. Contact Sokolove Law today to learn more.

Can Singulair cause mental illness or psychosis?

Yes — the FDA has strengthened its warning about the potentially serious mental health side effects of Singulair, including disorientation, hallucinations, memory problems, anxiety, depression, suicidal ideation and completion, and more.

If you took Singulair and experienced any of these side effects, you may be eligible to take legal action. Contact us today to learn more about your options.

Can Singulair cause anxiety or depression?

Yes — Singulair can cause a variety of mental health side effects, including anxiety and depression.

Is Singulair linked to suicide?

Sadly, yes — Singulair has been linked to both suicidal thoughts and completed suicides, according to the FDA.

Author:Sokolove Law Team
Sokolove Law Team

Contributing Authors

The Sokolove Law Content Team is made up of writers, editors, and journalists. We work with case managers and attorneys to keep site information up to date and accurate. Our site has a wealth of resources available for victims of wrongdoing and their families.

Last modified: November 17, 2021

View 2 Sources
  1. The U.S. Food and Drug Administration (FDA). "FDA requires Boxed Warning about serious mental health side effects for asthma and allergy drug montelukast (Singulair); advises restricting use for allergic rhinitis." Retrieved from: https://www.fda.gov/drugs/drug-safety-and-availability/fda-requires-boxed-warning-about-serious-mental-health-side-effects-asthma-and-allergy-drug. Accessed on June 2, 2021.
  2. MedPage Today. "Montelukast Warning Upgraded." Retrieved from: https://www.medpagetoday.com/allergyimmunology/allergy/85239. Accessed on June 3, 2021.