Kast 4mg Tablet is used to prevent asthma attacks in children. It may also be used to ease breathing difficulties caused by strenuous physical activities. This medicine also helps treat symptoms of skin and seasonal allergies, such as a runny nose, sneezing, itching, swelling, congestion, and watery eyes.

Give Kast 4mg Tablet to your child at a fixed time before or after food in the prescribed dose, time, and way. Your child may start to feel better after a few regular doses. However, you must still complete the treatment to ensure maximum benefit. Moreover, stopping the medicine abruptly may worsen your child’s condition.

Kast 4mg Tablet may cause some minor and temporary side effects like fever, headache, abdominal pain, and diarrhea. Usually, these side effects subside once your child’s body adapts to the medicine. However, in case these effects persist or start bothering your child, consult your child’s doctor without any delay.

Let your child’s doctor know if your child is already taking any medicines. Also, narrate your child’s complete medical history, including any prior episodes of allergy, heart problems, blood disorders, vascular disorders, birth defects, airway obstruction, lung anomaly, skin disorder, liver impairment, and kidney malfunction. This information is critical for adjusting doses and planning your child's treatment.

Uses of Kast 4mg Tablet in children

Asthma prevention
Treatment of Exercise-induced asthma
Treatment of Sneezing and runny nose due to allergies

Benefits of Kast 4mg Tablet for your child

In Asthma prevention

Kast 4mg Tablet helps prevent asthma symptoms by reducing airway inflammation and keeping the airways open, making breathing easier. It lowers the risk of asthma attacks and decreases the need for rescue medications.

In Treatment of Exercise-induced asthma

Kast 4mg Tablet helps prevent breathing difficulties triggered by exercise, reducing symptoms like wheezing, shortness of breath, and chest tightness. It allows individuals to engage in physical activities more comfortably.

In Treatment of Sneezing and runny nose due to allergies

Kast 4mg Tablet provides relief from symptoms such as a blocked or runny nose, sneezing, and itchy or watery eyes. This will make it easier for you to go about your daily activities. If you are taking it to prevent getting symptoms, you should use it regularly to get the most benefit.

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Side effects of Kast 4mg Tablet in children

Kast 4mg Tablet does not pose serious side effects and is well-tolerated by children. In case the side effects do occur, they’re likely to subside once the body adapts to the medicine. Consult your child’s doctor if these side effects persist or bother your child. The most common side effects include-

Common side effects of Kast

Headache
Fever
Sore throat
Cough
Otitis media (infection of ear)
Sinus inflammation
Flu
Upper respiratory tract infection
Diarrhea
Abdominal pain

How can I give Kast 4mg Tablet to my child?

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Kast 4mg Tablet may be taken with or without food, but it is better to take it at a fixed time.

How Kast Tablet works

Kast 4mg Tablet is a leukotriene antagonist that works by blocking a chemical messenger (leukotriene). This reduces inflammation (swelling) in the airways and nose and improves symptoms.

Safety advice

Kidney

SAFE IF PRESCRIBED

Kast 4mg Tablet is safe to use in patients with kidney disease. No dose adjustment of Kast 4mg Tablet is recommended.
However, consult your child’s doctor in case of severe kidney disease.

Liver

CAUTION

Kast 4mg Tablet should be used with caution in patients with liver disease. Dose adjustment of Kast 4mg Tablet may be needed. Please consult your doctor.
However, consult your child’s doctor in case of severe liver disease.

What if I forget to give Kast 4mg Tablet to my child?

Do not panic. Unless your child’s doctor has advised a specific regime for your child, give the missed dose as soon as you remember it. Skip the missed dose if it is almost the time for the next dose. Do not give a double dose to catch up and follow the prescribed dosing schedule.

All substitutes

For informational purposes only. Consult a doctor before taking any medicines.

Kast 4mg Tablet

₹10.6/Tablet

Lasma 4 Tablet

Apex Laboratories Pvt Ltd

₹8.97/tablet

15% cheaper

Romilast 4mg Tablet

RPG Life Sciences Ltd

₹11.23/tablet

6% costlier

Odimont 4mg Tablet

Zydus Cadila

₹8.82/tablet

17% cheaper

Tastymont Kid 4mg Tablet

Delvin Formulations Pvt Ltd

₹5.5/tablet

48% cheaper

Siokast 4mg Tablet

Sois Formulations Pvt Ltd

₹6.5/tablet

39% cheaper

View all substitutes

Quick tips

Make sure to keep all other rescue medicines handy for your child in case of any respiratory distress.
Never increase or decrease the dose of Kast 4mg Tablet on your own, as it can harm your child.
Never combine Kast 4mg Tablet with other cold and flu medicines, as that may cause some side effects.
If you are giving Kast 4mg Tablet to your child for asthma or allergy, you need not give another dose to prevent exercise-induced breathing problems. In case of any confusion, consult your child’s doctor as soon as possible.
Practice self-care tips like abstaining your child from coming in contact with allergens. Encourage your child to wear a face mask and avoid dusty places. Give plenty of fluids to your child, as that helps in thinning and loosening the mucus in the lungs.

Fact Box

Chemical Class

1,3-Diarylpropanoid Derivative

Habit Forming

Therapeutic Class

RESPIRATORY

Action Class

Leukotriene Antagonists

Interaction with drugs

Taking Kast with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Teriflunomide (Oral Route) Moderate

Watch out for symptoms of Montelukast side effects such as headache, diarrhea, abdominal pain or fever and consult your doctor if you experience them. Teriflunomide may raise blood... More

Leflunomide (Oral Route) Moderate

Watch out for symptoms of Montelukast side effects such as headache, diarrhea, abdominal pain or fever and consult your doctor if you experience them. Leflunomide may raise blood l... More

Repaglinide (Oral Route) Moderate

If concurrent use is essential, your doctor may monitor the blood sugar levels and may modify the dose as per the observation. Concurrent use may increase the blood levels of Repa... More

Mifepristone (Oral Route) Moderate

Watch out for symptoms of Montelukast side effects such as headache, diarrhea, abdominal pain or fever and consult your doctor if you experience them. Mifepristone may raise blood ... More

Clopidogrel (Oral Route) Moderate

watch out for symptoms such as abdominal pain, headaches or excessive involuntary movements and consult your doctor if you experience them. They may adjust the dose of Montelukast ... More

View all drug interactions

Patient concerns

Wheezing, sneezing, breathing trouble due to dust allergy. Seems cough is blocked in chest

Dr. Sfurti Mann

Internal Medicine

Consult personally May be asthma

Dosage foam of deriphyllin retard 150 Please suggest medication for exerise induced asthma

Dr. Pushkar Mani

Physician

U need to consult chest specialist for confirmation of asthma

Which food items should my child avoid taking along with Kast 4mg Tablet?

Do not give high-fat meals and fruit juices to your child along with Kast 4mg Tablet as they may interfere with the absorption of this medicine.

Can other medicines be given at the same time as Kast 4mg Tablet?

Kast 4mg Tablet can sometimes interact with other medicines or substances. Tell your doctor about any other medicines your child is taking before starting Kast 4mg Tablet. Also, check with your child’s doctor before giving any medicine to your child.

Can I decrease the dose of Kast 4mg Tablet by myself if my child starts to feel better?

No, adhere to the dose as prescribed by your child’s doctor. Do not increase or decrease the dose by yourself, as it can impact your child’s health. While increasing the dose may cause unwanted effects like sedation and depression, decreasing the dose or stopping it suddenly can result in a rebound reversal of all symptoms.

Can I stop the medicine by myself?

No, all symptoms may reappear on sudden withdrawal of Kast 4mg Tablet, usually if taken for a long time. It is advised to stop this medicine gradually under the guidance of your child’s doctor.

How should Kast 4mg Tablet be stored?

Kast 4mg Tablet should be stored at room temperature in a dry place, away from direct heat and light. Also, keep all medicines out of the reach and sight of children to avoid any accidental intake.

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Disclaimer:

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

References

Boushey HA. Drugs Used in Asthma. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. pp. 349-50.
Montelukast sodium [FDA Label]. White House Station, NJ: Merck & Co., Inc.; 2012. [Accessed 22 Feb. 2021] (online) Available from:
About Kids Health. Montelukast. [Accessed 31 Mar. 2021] (online) Available from:
University of Michigan: C.S. Mott Children’s Hospital. Montelukast. [Accessed 31 Mar. 2021] (online) Available from:
Montelukast sodium [FDA Label]. Pulaski, TN: AvKARE, Inc.; 2025. [Accessed 09 Mar. 2025] (online) Available from:

Marketer details

Name: Vintech Formulations

Address: Vintech Formulations, Ranwar Road, Ranwar Road, Karnal - 132001, Tata Depot P.B.

Country of origin: India

The list of available options shown with the same composition has been prepared upon the advice of registered medical practitioners, pharmacists affiliated with TATA 1MG. TATA 1MG does not promote any pharmaceutical product of any particular company, and all recommendations are based on the medical opinion, advisories from specialist medical and pharmaceutical professionals.