For medical guidance on side effects, contact your doctor. Typical negative effects could be: Get emergency medical help if you have signs of an allergic reaction: hives, blisters, severe itching; difficult breathing; swelling of your face, lips, tongue, or throat. The negative effects of montelukast Some montelukast users have experienced the onset or worsening of mental disorders. If you experience unusual changes in mood or behavior, including any of the following: If you experience any of the following symptoms of blood vessel inflammation: flu-like symptoms, excruciating sinus pain, a skin rash, numbness, or a "pins and needles" sensation in your arms or legs, contact your doctor right away. There may be other side effects; this is not a comprehensive list. Call 1-800-FDA-1088 to report side effects to the FDA. the following symptoms: agitation, aggression, restlessness or irritability; anxiety, depression, confusion, memory or attention issues; stuttering, tremors, uncontrollable muscle movements; suicidal thoughts or actions; hallucinations, sleep issues, vivid dreams, sleep-walking; or compulsive or repetitive behaviors. stomachaches, diarrhoea, fever or other flu-like symptoms, earaches or a full-headed sensation, hearing difficulties, headaches, or cold-related symptoms like a stuffy or runny nose, sinus pain, coughing, or sore throat.
For more details, consult your physician or pharmacist. Tell your doctor right away if you take any of the following medications: Rifamycin antibiotics (rifabutin, rifampin, rifapentine) Seizure medications (carbamazepine, phenobarbital, phenytoin). This is not a complete list of montelukast drug interactions. Inform your doctor about every medication you take, including vitamins, herbal supplements, prescription drugs, and over-the-counter medications.
Be sure to mention gemfibrozil (Lopid), phenobarbital and rifampin (Rifadin, Rimactane, in Rifamate, Rifater). Tell your doctor and pharmacist before taking montelukast if you have any allergies to it, any other medications, or any of the ingredients in the tablet, chewable tablet, or granule form of the medication. If you become pregnant while taking montelukast, call your doctor. If you have phenylketonuria (PKU), a condition that is inherited and requires a special diet to prevent brain damage that could result in severe intellectual disability, you should be aware that the chewable tablets contain aspartame, which turns phenylalanine into phenylalanine. Your doctor may need to change the doses of your medications or monitor you more carefully for side effects. tell your doctor if you have or have ever had liver disease. tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.