Montelukast: What It Does, How to Use It, and What to Watch For

Ever wondered whether montelukast could help your asthma or seasonal allergies? Montelukast (brand name Singulair) is a pill that blocks leukotrienes—chemicals that cause inflammation, tight airways, and allergic symptoms. People use it to reduce asthma attacks, ease exercise-induced bronchospasm, and control allergic rhinitis (hay fever).

It’s a once-a-day medicine, usually taken in the evening. Why evening? Many asthma symptoms get worse at night, and montelukast works overnight to lower inflammation. Still, follow your prescriber’s advice about timing.

Common Doses and Who Gets What

Adult dose: 10 mg once daily for people 15 years and older. For children the dosing changes: ages 6–14 often get 5 mg chewable daily; ages 2–5 may get 4 mg chewable. There are special pediatric forms and formulations—always use the exact product your doctor prescribes and check the package for age guidance.

Montelukast is not for sudden breathing problems. Keep a rescue inhaler (like albuterol) on hand for attacks. If your breathing suddenly worsens after starting montelukast, seek medical help immediately.

Side Effects and Safety Tips

Most people tolerate montelukast well. Common side effects include headache, stomach upset, and mild sleep problems. There’s a notable safety concern: the FDA has reported rare but serious neuropsychiatric events—agitation, depression, vivid dreams, and in rare cases suicidal thoughts. Watch for mood or behavior changes, especially in children, and contact your provider right away if those appear.

Also check for interactions: montelukast can interact with some drugs and supplements. Tell your doctor about all medicines you take—prescription, OTC, and herbal—so they can check for problems. If you have liver disease, your doctor may monitor liver tests because montelukast is processed in the liver.

Pregnancy and breastfeeding: information is limited. If you’re pregnant or nursing, talk to your clinician about risks and benefits before starting montelukast.

Want a quick tip? Keep a simple symptom log for two weeks after starting montelukast—note breathing, sleep, mood, and any new side effects. That record makes clinic visits more productive.

Thinking of buying montelukast online? Use a licensed pharmacy with clear contact info, require a valid prescription, and avoid suspiciously low prices or sites that won’t verify credentials. Check for secure checkout (look for https:// and a padlock) and read privacy policies so your health data stays protected.

Final practical note: montelukast works best as part of an overall plan. Use it with inhalers, avoid known triggers, and follow-up with your provider to adjust treatment as needed. If something suddenly feels off—especially mood or breathing—don’t wait. Call your clinic or emergency services.