You may report side effects to the FDA at 1-800-FDA-1088.Portions of this document last updated: June 01, 2020Copyright © 2020 IBM Watson Health. An interaction between two medications does not always mean that you must stop taking one of the medications; however, sometimes it does. This medicine may increase certain white blood cells (eosinophils) and may cause Churg-Strauss syndrome (blood vessel disease). © 1998-2020 Mayo Foundation for Medical Education and Research (MFMER). Talk to your doctor or get medical care right away if:Montelukast may cause some people to be agitated, disoriented, irritable, or display other abnormal behaviors. All rights reserved. Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below. The drug montelukast is covered under the class of drugs called as leukotriene receptor antagonists. "Just stop taking it and the side effects will pass." Drug information provided by: IBM Micromedex Along with its needed effects, a medicine may cause some unwanted effects. Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below. This usually occurs in patients who have asthma or are taking oral steroid medicines that is being stopped or the dose is being reduced or lowered. Brand name: Singulair. Portions of this document last updated: June 01, 2020Copyright © 2020 IBM Watson Health. © 1998-2020 Mayo Foundation for Medical Education and Research (MFMER). Our general interest e-newsletter keeps you up to date on a wide variety of health topics.Along with its needed effects, a medicine may cause some unwanted effects. Montelukast oral tablet is available as a brand-name drug and a generic drug. It may also cause some people to have suicidal thoughts and tendencies or to become more depressed. Common medications that may interact with montelukast include: anticonvulsants, such as carbamazepine, divalproex, fosphenytoin, or phenytoin Stop taking motelukast and call your doctor right away if you have unusual changes in mood or behavior, such as: anger, aggression, feeling restless or irritable; agitation, anxiety, depression, confusion, problems with memory or attention; suicidal thoughts or actions; As long as they are slowly stopping, even if they are coming and going I would just wait it out and double check with the allergist when you see them. You may be taking other medicines for asthma together with montelukast. Advertising revenue supports our not-for-profit mission.Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. These side effects may go away during treatment as your body adjusts to the medicine. Speak to your doctor about how drug interactions should be managed. You may be taking other medicines for asthma together with montelukast. Do not take other medicines unless they have been discussed with your doctor. Also tell the doctor if you or your child have sudden or strong feelings, such as feeling nervous, angry, restless, violent, or scared. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements. Though the medicine shod not be taken on ones own please note as under and do not forget the summary. All rights reserved. Advertising revenue supports our not-for-profit mission.Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.Mayo Clinic does not endorse companies or products. Increase certain white blood cells ( eosinophils ) and may cause some unwanted effects tell you about ways prevent... 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