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 can cause serious neuropsychiatric injuries or mental health side effects, and the risk may be greater in children taking Singulair than adults.

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 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 can not 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.

Get the Help You Deserve

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

Get a Free Case Review

Singulair Class Action Lawsuits

Generally drug cases are handled individually, not as class actions. As of 2021, 10 cases were filed and are pending in New Jersey state 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 & Co. Inc. 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

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.

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
  • Receiving compensation through a Singulair settlement or jury verdict

Learn more about your potential legal options by contacting us for a free case review today.

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 may have a case.

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.

Our Singulair lawyers have the resources and reach needed to build your case and fight for as much compensation as possible in your case.

Contact us today to learn more about the legal options that may be available to you.

Singulair (Montelukast) Lawsuit FAQs

Is montelukast Singulair?

Singulair is the brand name for the prescription drug montelukast that treats asthma and allergies.

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: Accessed on June 2, 2021.

  2. MedPage Today. “Montelukast Warning Upgraded.” Retrieved from: Accessed on June 3, 2021.