Montelukast (Oral Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

• Abdominal or stomach pain
• Bloody nose
• Flu-like symptoms
• General feeling of discomfort or illness
• Headache
• Joint pain
• Pain or tenderness around the eyes and cheekbones
• Shortness of breath or troubled breathing
• Sweating
• Tightness of the chest
• Trouble with swallowing
• Unusual tiredness or weakness

• Pus in the urine

• Agitation
• Anxiety
• Attempts at killing oneself
• Breathing problems
• Confusion about identity, place, and time
• Constipation
• Fast, irregular, pounding, or racing heartbeat or pulse
• Feeling sad or empty
• Hives or welts
• Indigestion
• Itching, puffiness, or swelling of the eyelids or around the eyes, face, lips, or tongue
• Lack of appetite
• Pains in the stomach, side, or abdomen, possibly moving to the back
• Redness of the skin
• Shaking or trembling of the hands or feet
• Trouble with concentrating
• Unable to sleep
• Unpleasant breath odor
• Upper right abdominal or stomach pain
• Vomiting of blood
• Yellow eyes or skin

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Acid or sour stomach
• Belching
• Blurred vision
• Change in near or distance vision
• Dental pain
• Earache
• Heartburn
• Lack or loss of strength
• Pain
• Skin rash, encrusted, scaly and oozing
• Stomach discomfort, upset, or pain

• Burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feelings
• Dreams that are unusual
• Increased tendency to bleed
• Large, flat, blue or purplish patches on the skin
• Muscle aching or cramping
• Sleepiness
• Swollen joints

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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