Montelukast 10mg Tablet can be taken with or without food at the same time daily for maximum benefit. If you have exercise-induced asthma, take it two hours before exercising as advised by your doctor. The dosage and frequency depend on your condition, with your doctor determining the appropriate amount to alleviate symptoms. This medication does not treat sudden breathing problems, so always carry a medicated inhaler. Common side effects include nausea, vomiting, headache, abdominal pain, and diarrhea. Inform your doctor about any severe liver problems, medications, pregnancy, or breastfeeding.