Montelukast Side Effects and Warnings

What are the precautions when taking this medicine?

• Do not use this medicine to prevent exercise-induced breathing problems if you are already using it for asthma or allergy.

• Wear disease medical alert identification.

• Check medicines with healthcare provider. This medicine may not mix well with other medicines.

• If you have PKU, talk with healthcare provider. Some products do contain phenylalanine.

• Tell healthcare provider if you are pregnant or plan on getting pregnant.

• Tell healthcare provider if you are breast-feeding.

What are some possible side effects of this medicine?

• Flu-like symptoms. These include headache, weakness, fever, shakes, aches, pains, and sweating. Mild pain medicine may help.

• Nervous and excitable.

• Headache.

• Belly pain.

• Nausea or vomiting. Small frequent meals, frequent mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.

• Nasal congestion.

Reasons to call healthcare provider immediately

• If you suspect an overdose, call your local poison control center or emergency department immediately.

• Signs of a life-threatening reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; fits; or swelling of face, lips, tongue, or throat.

• Signs or symptoms of depression, suicidal thoughts, nervousness, emotional ups and downs, abnormal thinking, anxiety, or lack of interest in life.

• Difficulty breathing.

• Persistent cough.

• Increased use of short-acting inhaler.

• Numbness or tingling of hands or feet.

• Dark urine or yellow skin or eyes.

• Not able to eat.

• Any rash.

• No improvement in condition or feeling worse.