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Mefast 100 Suspension

Mefenamic Acid (100mg/5ml)
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Mefast 100 Suspension is a nonsteroidal anti-inflammatory drug (NSAID). It helps relieve pain and inflammation (redness and swelling) in children. It works by blocking the action of a chemical messenger that is known to cause fever, pain, and inflammation.

Written By Dr. Lipika Khurana, PGDHHM, BDS,
Reviewed By Dr. Rajeev Sharma, MBA, MBBS,
Last updated on 11 May 2026 | 12:07 PM (IST)
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60 ml Oral Suspension
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Mefast 100 Suspension image
Mefast 100 Suspension image
Mefast 100 Suspension image

Your child’s medicine at a glance

Follow the prescribed dose, timing, and method when giving Mefast 100 Suspension to your child. Give it orally, preferably after food, to reduce the chance of stomach upset. If your child vomits within 30 minutes of taking this medicine, give the same dose again. Do not give more than the recommended dose for faster relief, as this may cause unwanted side effects in your child.


Your child may exhibit side effects like nausea, vomiting, stomach pain, heartburn, and diarrhea after taking this medicine. These side effects are temporary and are likely to subside once your child's body adapts to the medicine. In case they persist or become bothersome for your child, do consult your child's doctor on a priority basis.


Before administering Mefast 100 Suspension to your child, inform the doctor if your child is allergic to any medicine or products or has a history of any heart problems, birth defects, liver disease, kidney disease, lung disease, or bleeding disorder. This information is critical for dose alteration and helps in planning your child's overall treatment.

Uses of Mefast 100 Suspension in children

  • Pain relief : Mefast 100 Suspension helps relieve pain in conditions such as headaches, body aches, muscle pain, toothaches, and minor injuries.

Benefits of Mefast 100 Suspension for your child

Pain relief
Pain can occur due to inflammation or injury affecting different parts of the body. Mefast 100 Suspension works by blocking chemical messengers that cause pain and inflammation. This helps relieve discomfort in conditions such as headache, toothache, muscle pain, and joint pain. Use it at the lowest effective dose for the shortest duration as advised by your doctor.

Side effects of Mefast 100 Suspension in children

Mefast 100 Suspension 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 Mefast
  • Stomach pain
  • Vomiting
  • Nausea
  • Headache
  • Dizziness

How can I give Mefast 100 Suspension to my child?

Take this medicine in the dose and duration as advised by your doctor. Check the label for directions before use. Measure it with a measuring cup and take it by mouth. Shake well before use. Mefast 100 Suspension should be taken with or after food.

How Mefast Oral Suspension works

Mefast 100 Suspension is a non-steroidal anti-inflammatory drug (NSAID). It works by blocking the release of certain chemical messengers that cause fever, pain, and inflammation (redness and swelling).

Quick tips

  • Mefast 100 Suspension should be given to children exactly as prescribed by the doctor, and the dose and frequency should be carefully tracked to avoid overdosing.
  • Maintain a record of your child’s temperature and symptoms while using Mefast 100 Suspension, and consult the doctor if there is no improvement.
  • Avoid giving Mefast 100 Suspension with other NSAIDs (such as ibuprofen, diclofenac, or aspirin) unless advised by your doctor.
  • Ensure your child drinks plenty of fluids and gets adequate rest, as hydration and sleep support recovery during illness.
  • Inform your doctor if your child has kidney or liver disease before using Mefast 100 Suspension.
  • Avoid using Mefast 100 Suspension if the child is dehydrated due to vomiting, diarrhea, or excessive heat, and consult the doctor instead.
  • Stop using Mefast 100 Suspension and seek urgent medical care if your child develops severe stomach pain, black stools, or vomiting of blood.
  • Stop the medicine and consult the doctor immediately if allergic symptoms such as rash, swelling, or breathing difficulty occur.
  • Do not use Mefast 100 Suspension routinely for fever in children unless prescribed by a doctor.
  • Consult your doctor if symptoms persist or if repeated use of Mefast 100 Suspension is required.

Safety advice

Kidney

Kidney

UNSAFE
Mefast 100 Suspension is unsafe to use in patients with kidney disease and should be avoided.
Liver

Liver

CAUTION
Mefast 100 Suspension should be used with caution in patients with severe liver disease. Dose adjustment may be needed.

Interaction with drugs

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

Tacrolimus (Oral Route)

If concurrent use is essential, your doctor may monitor your tacrolimus levels, potassium levels and kidney function closely. They may adjust the doses as per the observations.
Severe

Methotrexate (Injection Route)

Please consult with your doctor. Doctor may monitor liver function and blood cell counts.
Severe

Methotrexate (Injection Route)

Please consult with your doctor. Doctor may monitor liver function and blood cell counts.
Severe

Methotrexate (Injection Route)

Please consult with your doctor. Doctor may monitor liver function and blood cell counts.
Severe

Methotrexate (Injection Route)

Please consult with your doctor. Doctor may monitor liver function and blood cell counts.

Frequently asked questions

Mefast 100 Suspension is a pain-relief medicine that contains mefenamic acid, which belongs to a group of medicines called non-steroidal anti-inflammatory drugs (NSAIDs). It is used to relieve mild to moderate pain and inflammation in children, including toothaches, muscle pain, joint pain, and other short-term painful conditions. The medicine works by reducing certain chemicals in the body that cause pain and swelling. Mefast 100 Suspension helps relieve symptoms but does not treat the underlying cause of pain. It should be used only as prescribed by a doctor.
Some children may experience side effects such as stomach pain, acidity, nausea, vomiting, diarrhea, or dizziness while taking Mefast 100 Suspension. These effects occur because medicines in this group can irritate the stomach lining. In some cases, the child may develop a rash or swelling as a sign of an allergic reaction. Rarely, the medicine may cause stomach bleeding. Seek medical attention immediately if you notice black stools, vomiting blood, severe stomach pain, or swelling of the face or throat.
Yes, Mefast 100 Suspension is usually recommended to be taken with food or after meals. Taking it with food can help reduce stomach irritation, acidity, nausea, or discomfort that may occur when the medicine is taken on an empty stomach. Avoid giving multiple pain medicines together unless the doctor advises it, and consult your child's doctor if your child has a history of stomach ulcers or severe acidity.
The correct dose of Mefast 100 Suspension for a child should always be determined by a doctor. The dose depends on the child’s body weight, age, and medical condition. Always follow the dosing schedule prescribed by your child’s doctor to ensure the medicine is safe and effective.
No, you should not increase or decrease the dose of Mefast 100 Suspension without consulting the doctor. Increasing the dose may raise the risk of side effects or toxicity, while lowering the dose may reduce the medicine’s effectiveness and allow symptoms to return. If you think the dose needs adjustment, discuss it with your child’s doctor.
No, the same dose should not be given to all children. The correct dose depends on the child’s age, body weight, and medical condition. As children grow, the appropriate dose may also change. Always follow your doctor’s instructions and do not give this medicine to another child without medical advice.
After starting Mefast 100 Suspension, the medicine may begin to reduce pain or fever within a short time. However, your child may need to take it for several days depending on the condition. Continue giving the medicine exactly as prescribed by the doctor. If your child does not improve or continues to feel unwell after completing the recommended course, consult your child’s doctor.
Mefast 100 Suspension is generally well tolerated in most children when used at the correct dose. However, seek medical attention immediately if your child develops persistent vomiting, swelling of the body, decreased urination, signs of an allergic reaction such as rash or breathing difficulty, or severe stomach pain that may indicate stomach irritation or ulcers.
Mefast 100 Suspension should not be used for fever associated with dengue because it may interfere with blood clotting and increase the risk of bleeding. It is also not usually recommended for COVID-19 unless advised by a doctor. In these situations, doctors may recommend other fever-reducing medicines that are considered safer.
If your child is scheduled for a dental extraction or surgical procedure, the doctor may advise stopping Mefast 100 Suspension a few days beforehand to reduce the risk of bleeding during the procedure. Always follow the instructions given by the doctor or dentist.
Mefast 100 Suspension may interact with some other medicines. Before starting treatment, inform the doctor about all medicines, supplements, or herbal products your child is taking. Always check with your child’s doctor before giving any additional medicine at the same time.

Fact Box

Chemical Class

Aminobenzoic acids

Habit Forming

No

Therapeutic Class

PAIN ANALGESICS

Action Class

NSAID's- Non-Selective COX 1&2 Inhibitors (fenamates)

References

  1. Grosser T, Smyth E, FitzGerald GA. Anti-Inflammatory, Antipyretic, and Analgesic Agents; Pharmacotherapy of Gout. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. p. 989.
  2. Mefenamic Acid [FDA Label]. Atlanta, GA: Sciele Pharma, Inc.; 2018. [Accessed 06 Jan. 2021] (online) Available from:
  3. Mefenamic Acid [Product information]. Sandton, South Africa: Pfizer Laboratories (Pty) Ltd.; 2024. [Accessed 02 Jul. 2025] (online) Available from:
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User feedback

Once A Day
67%
Thrice A Day
14%
Twice A Day
14%
Four Times A Day
5%
Fever
53%
Others
33%
Pain relief
13%
Poor
56%
Average
33%
Excellent
11%
No Side Effect
50%
Vomiting
50%
With food
100%
Not Expensive
100%
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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.

Marketer details

Name: Zuventus Healthcare Ltd
Address: Office No. 5119, 5th Floor, 'D' Wing, Oberoi Garden Estates, Chandivili, Andheri (E), Mumbai - 400 072.

Vendor Details

Country of origin: India
A licensed vendor partner from your nearest location will deliver Mefast 100 Suspension. Once the pharmacy accepts your order, the details of the pharmacy will be shared with you. Acceptance of your order is based on the validity of your doctor's ℞ and the availability of this medicine.

In case of any issues, contact us

Email ID: [email protected]
Phone Number: 0124-4166666
Address: 5th Floor Tower - B of the Presidency Building, 46/4 Mehrauli Gurgaon Road, Sector 14, Gurugram, Haryana-122001, India
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