Prescription requiredAntiallergic

Montiva-Fx Tab — Side Effects & Warnings

Known side effects of Montiva-Fx Tab include Headache, dizziness, drowsiness, nausea, stomach pain, diarrhea, dry mouth, fatigue. Not everyone experiences these side effects.

Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated August 2026

Common Side Effects

Headache
dizziness
drowsiness
nausea
stomach pain
diarrhea
dry mouth
fatigue

This is not an exhaustive list. Consult your doctor if you notice any unusual symptoms.

Important Warnings

Use with caution in liver disease (montelukast) and in patients with history of neuropsychiatric symptoms; montelukast has been associated rarely with mood/behavior changes (agitation, sleep disturbances, depression, suicidal thoughts)—seek medical help if these occur. Not for acute asthma attack. Avoid driving if you feel drowsy/dizzy. Use in children only if specifically prescribed (strength may not be suitable).

Drug Interactions

Montiva-Fx Tab may interact with the following:

Rifampicin
phenytoin
phenobarbital (may reduce montelukast levels); ketoconazole/gemfibrozil (may increase montelukast exposure); antacids containing aluminium/magnesium may reduce fexofenadine absorption (separate by ~2 hours); fruit juices (apple/orange/grapefruit) can reduce fexofenadine absorption; other sedating medicines may increase dizziness/drowsiness.

Always tell your doctor about all medicines you are taking, including over-the-counter drugs and supplements.

Pregnancy Safety

Consult doctor

Alcohol Interaction

Use with caution

Habit Forming

Storage

Store below 25°C in a dry place, protected from light and moisture. Keep out of reach of children.

Montiva-Fx Tab — Safety Summary

Composition: Montelukast (10mg) + Fexofenadine (120mg)
Prescription: Required (Rx)
Pregnancy: Consult doctor
Alcohol: Use with caution
Habit forming: No

Montiva-Fx Tab — Safety FAQs

What should I do if I experience side effects?

Mild side effects often resolve on their own. If side effects are severe or persistent, stop the medicine and consult your doctor immediately.

Are all listed side effects common?

No. Some side effects are common while others are rare. Not everyone experiences side effects. Consult your doctor if you are concerned.

Can I take this medicine with other drugs?

Some medicines interact with each other. Always inform your doctor about all medicines you are currently taking.

When should I seek emergency help?

Seek immediate medical attention if you experience severe allergic reactions (difficulty breathing, swelling of face/throat), chest pain, or any life-threatening symptoms.

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Safety disclaimer

This information is for educational purposes only and is not a substitute for professional medical advice. If you experience severe side effects, seek medical attention immediately.