Allegra-M
Allegra-M is a tablet made by Sanofi that contains Fexofenadine 120 mg + Montelukast 10 mg. It combines Fexofenadine: antihistamine (non-drowsy) and Montelukast: anti-allergy and asthma preventer.
| Ingredient (salt) | Amount |
|---|---|
| Fexofenadine | 120 mg |
| Montelukast | 10 mg |
Fexofenadine
What it is used for
Relieves seasonal allergies (sneezing, runny nose, itchy eyes) and hives.
How it works
A non-drowsy antihistamine that does not enter the brain much, so it rarely causes sleepiness.
How to take it
Adults: 120 mg once a day for hay fever, 180 mg for hives. Take with water, not fruit juice, and not within 2 hours of an antacid.
Common side effects
- Headache
- Nausea
- Dizziness
Get medical help straight away if
Allergic reaction
Be careful
Do not take with fruit juices or antacids close together; they reduce its effect.
Other medicines and interactions
Fruit juices (apple, orange, grapefruit) and aluminium or magnesium antacids reduce how much is absorbed.
Pregnancy and breastfeeding
Ask a doctor; cetirizine or loratadine are more often chosen in pregnancy. Considered acceptable while breastfeeding.
Montelukast
What it is used for
Prevents asthma attacks and reduces allergic nose symptoms.
How it works
It blocks leukotrienes, chemicals that narrow the airways and cause allergic swelling. It prevents asthma symptoms but does not relieve an attack.
How to take it
Adults take 10 mg once a day in the evening; children get 4 or 5 mg chewables or granules. Keep taking it even when well, and keep a reliever inhaler for attacks.
Common side effects
- Headache
- Stomach pain
- Diarrhoea
- Upper respiratory infection
Get medical help straight away if
- Mood or behaviour changes, bad dreams, agitation, depression or suicidal thoughts (stop and tell your doctor)
- Pins and needles with rash (rare vasculitis)
Be careful
Can rarely cause mood changes or bad dreams; tell your doctor if this happens.
Other medicines and interactions
Phenobarbital and rifampicin can lower its level. Otherwise few interactions.
Pregnancy and breastfeeding
May be continued in pregnancy if it controls asthma well; uncontrolled asthma is a bigger risk. Ask your doctor about breastfeeding.
Same composition, other brands (1)
Ask your doctor or pharmacist before switching brands.
Common questions
What is Allegra-M?
Allegra-M is a tablet by Sanofi containing Fexofenadine 120 mg + Montelukast 10 mg.
What is Allegra-M used for?
Relieves seasonal allergies (sneezing, runny nose, itchy eyes) and hives. Prevents asthma attacks and reduces allergic nose symptoms.
How should I take Allegra-M?
Adults: 120 mg once a day for hay fever, 180 mg for hives. Take with water, not fruit juice, and not within 2 hours of an antacid. Adults take 10 mg once a day in the evening; children get 4 or 5 mg chewables or granules. Keep taking it even when well, and keep a reliever inhaler for attacks. Always follow the dose your doctor or the pack gives.
What are the side effects of Allegra-M?
Common side effects include: Headache, nausea, dizziness, Headache, stomach pain, diarrhoea, upper respiratory infection. Get medical help straight away for: Allergic reaction, Mood or behaviour changes, bad dreams, agitation, depression or suicidal thoughts (stop and tell your doctor), pins and needles with rash (rare vasculitis).
Does Allegra-M need a prescription?
Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.
Can I take Allegra-M in pregnancy or while breastfeeding?
Ask a doctor; cetirizine or loratadine are more often chosen in pregnancy. Considered acceptable while breastfeeding. May be continued in pregnancy if it controls asthma well; uncontrolled asthma is a bigger risk. Ask your doctor about breastfeeding.
What are the substitutes for Allegra-M?
Brands with the same composition: Montair FX. Ask your doctor or pharmacist before switching.
Sources and further reading
- Fexofenadine: NHS · MedlinePlus
- Montelukast: NHS · MedlinePlus
NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.
Composition checked against pack details from large Indian online pharmacies. Last reviewed 31 October 2026. Written by Satya Babu.
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