Leukotriene receptor antagonist
Montelukast drug interactions: a practical overview
Drug interactions are the single biggest cause of preventable medication problems. Montelukast (Montelukast) interacts to varying degrees with several classes of medication and with a smaller list of foods. This page summarises the practically important ones at 4mg, 5mg, 10mg, framed for a real-world prescription review rather than an exhaustive PDF list.
High-priority interactions for Montelukast
For Montelukast, the most clinically relevant interactions are typically with strong CYP3A4 inhibitors and inducers, with cardiovascular medications (notably nitrates for several Leukotriene receptor antagonist agents), with central nervous system depressants, and with medications affecting blood pressure or heart rate. Montelukast selectively blocks the CysLT1 receptor, which mediates the action of leukotrienes C4, D4 and E4 — proinflammatory mediators released by mast cells and eosinophils in the airway.
Working with the pharmacist
A pharmacist review of all current medications is the practical safeguard against unintended interactions with Montelukast. According to the prescribing information for Montelukast, the full medication list — prescription, OTC, supplements and recreational substances — should be reviewed before starting and at every dose change at 4mg, 5mg, 10mg.
Frequently asked questions
What's the most important Montelukast interaction to know? ▾
For most Leukotriene receptor antagonist medications, the highest-priority interaction is with nitrate medications used for chest pain — this combination is often a hard contraindication. After that, strong CYP3A4 inhibitors (some antifungals, macrolides) are the next concern at routine 4mg, 5mg, 10mg doses.
Do I need to tell the pharmacist about supplements? ▾
Yes. Supplements and herbal products can interact with Montelukast in ways that prescription drug-drug interaction databases miss. The pharmacist needs the complete picture — including supplements like St John's Wort, grapefruit-containing products and high-dose vitamins — to flag risks at 4mg, 5mg, 10mg.
Products containing Montelukast
More on Montelukast
- With alcoholMontelukast and alcohol — is it safe to drink?
- With foodShould Montelukast be taken with food?
- Side effectsMontelukast side effects: common, rare and warning signs
- Dosage guideMontelukast dosage guide: how much to take and when
- OnsetHow fast does Montelukast start working?
- DurationHow long does Montelukast last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.