Feldex Syrup

Reviewed By Dr. Rajeev Sharma, MBA, MBBS

Last updated on 14 Mar 2026 | 12:02 AM (IST)

Feldex Syrup is a combination medicine used to treat cough. It thins mucus in the nose, windpipe, and lungs, making it easier to cough out. It also provides relief from a runny nose, watery eyes, and throat irritation.

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General Information

Contains

Ammonium Chloride (60mg/5ml)+ Chlorpheniramine Maleate (2.5mg/5ml)+ Dextromethorphan Hydrobromide (5mg/5ml)+ Guaifenesin (50mg/5ml)

Marketer

Instant Remedies Pvt Ltd

Storage

Store below 30°C

The content is shown in English

Product introduction

Feldex Syrup is taken with or without food in a dose and duration as advised by the doctor. The dose you are given will depend on your condition and how you respond to the medicine. You should keep taking this medicine for as long as your doctor recommends. If you stop treatment too early, your symptoms may come back, and your condition may worsen. Let your doctor know about all other medications you are taking, as some may affect, or be affected by, this medicine.

The most common side effects are nausea, stomach upset, diarrhea, stomach pain, vomiting, headache, and rash. Most of these are temporary and usually resolve with time. Contact your doctor straight away if you are at all concerned about any of these side effects. This medicine may cause dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you. Avoid drinking alcohol while taking this medicine, as it can make dizziness worse.

Never support self-medication or recommend your medicine to another person. It is beneficial to have plenty of fluids while taking this medication. Before you start taking this medicine, it is important to inform your doctor if you are suffering from liver or kidney disease. You should tell your doctor if you are pregnant or planning a pregnancy.

Uses of Feldex Syrup

Treatment of Cough

Benefits of Feldex Syrup

Treatment of Cough
A cough is a sudden, forceful expulsion of air that helps clear any mucus or irritant in the throat or airways. If it happens more frequently, due to an underlying disease or an allergy, it can be bothersome. Feldex Syrup is a combination medicine that helps to loosen thick mucus, making it easier to cough out. This makes it easier for air to move in and out. It also helps relieve allergy symptoms like watery eyes, sneezing, runny nose, or throat irritation, and helps you carry out your daily activities more easily.

Side effects of Feldex Syrup

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Feldex

Nausea
Diarrhea
Vomiting
Dizziness
Headache
Sedation
Double vision
Dryness in mouth
Nervousness
Decreased appetite
Heartburn
Weakness
Discomfort when urinating
Polyuria
Urinary retention
Insomnia (difficulty in sleeping)
Arrhythmia (irregular heartbeats)
Respiratory disorder
Increased heart rate
High blood pressure
Hallucination
Tremors
Pale skin
Convulsion

How to use Feldex Syrup

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. Feldex Syrup may be taken with or without food.

How Feldex Syrup works

Ammonium chloride, chlorpheniramine, dextromethorphan, and guaifenesin, which relieve cough. Ammonium chloride and guaifenesin are expectorants that decrease the stickiness of mucus (phlegm) and help in its removal from the airways. Chlorpheniramine is an antiallergic that relieves allergy symptoms like a runny nose, watery eyes, and sneezing. Dextromethorphan is a cough suppressant that relieves cough by reducing the activity of the cough centre in the brain.

Quick tips

Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medication.
It may cause dizziness and sleepiness. Do not drive or do anything that requires mental focus until you know how it affects you.
If you are diabetic, monitor your blood glucose regularly while taking this medicine.
Inform your doctor if you have a history of thyroid or heart disease.
Stop taking Feldex Syrup and inform your doctor if your cough persists for more than 1 week, tends to recur, or is accompanied by a fever, rash, or persistent headache.

Safety advice

Alcohol

CONSULT YOUR DOCTOR

It is not known whether it is safe to consume alcohol with Feldex Syrup. Please consult your doctor.

Pregnancy

CONSULT YOUR DOCTOR

The safety of Feldex Syrup during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.

Breast feeding

CONSULT YOUR DOCTOR

Feldex Syrup may be unsafe to use during breastfeeding. Limited human data suggests that the drug may pass into the breastmilk and harm the baby. It should be used only if the expected benefit outweighs the potential risk. Please consult your doctor.

Driving

UNSAFE

Feldex Syrup may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.

Kidney

CAUTION

Feldex Syrup should be used with caution in patients with kidney disease. Dose adjustment may be needed.

Liver

CAUTION

Feldex Syrup should be used with caution in patients with liver disease. Dose adjustment may be needed.

Frequently asked questions

What is Feldex Syrup?

Feldex Syrup is a combination of four medicines: Ammonium chloride, chlorpheniramine, dextromethorphan and guaifenesin which relieves cough. Ammonium chloride and guaifenesin are expectorants which decrease the stickiness of mucus (phlegm) and help in its removal from the airways. Chlorpheniramine is an antiallergic which relieves allergy symptoms like runny nose, watery eyes and sneezing. Dextromethorphan is a cough suppressant that relieves cough by reducing the activity of cough center in the brain.

Can the use of Feldex Syrup cause dryness in mouth?

Yes, the use of Feldex Syrup can cause dry mouth. If you experience dry mouth, drink plenty of water. Take regular sips during the day and keep some water by your bed at night. You may use lip balm if your lips are also dry.

Can the use of Feldex Syrup cause dizziness?

Yes, the use of Feldex Syrup can cause dizziness (feeling faint, weak, unsteady or lightheaded) in some patients. If you feel dizzy or lightheaded, it is better to rest for some time and resume once you feel better.

Can the use of Feldex Syrup cause diarrhea?

Yes, the use of Feldex Syrup can cause diarrhea. In case of diarrhea, drink plenty of water or other fluids by taking small frequent sips. Also, avoid taking fatty or fried foods along with this medication. Talk to your doctor if diarrhea persists and you notice signs of dehydration, like less urination with dark colored and strong-smelling urine. Do not take any other medicine without speaking to your doctor.

Can the use of Feldex Syrup cause nausea and vomiting?

Yes, the use of Feldex Syrup can cause nausea and vomiting. Taking it with milk, food or with antacids can prevent nausea. Avoid taking fatty or fried foods with this medication. In case of vomiting, drink plenty of water or other fluids by taking small frequent sips. Talk to your doctor if vomiting persists and if you notice signs of dehydration, like dark colored and strong-smelling urine and a low frequency of urination. Do not take any other medicine without speaking to your doctor.

What is the recommended storage condition for Feldex Syrup?

Keep this medicine in the container or the pack it came in, tightly closed. Store it according to the instructions mentioned on the pack or label. Dispose of the unused medicine. Make sure it is not consumed by pets, children and other people.

Fact Box

Habit Forming

Therapeutic Class

RESPIRATORY

References

ScienceDirect. Ammonium chloride. [Accessed 17 Apr. 2019] (online) Available from:

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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: Instant Remedies Pvt Ltd
Address: Instant Remedies Pvt. Ltd., Plot No. 177, Industrial Area Phase II, Opposite to Platinum Honda, Industrial Area Phase II, Chandigarh, 160002, India

Vendor Details

Country of origin: India

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Why we need a prescription?

Provide right medicines

Prescriptions are complex documents. We proof read and recheck at various steps to provide you the right medication in the correct form and dose

In accordance with the law

Most medicines cannot be sold without a valid prescription, as per the Drugs and Cosmetics Act, 1940 and Rules, 1945

Feldex Syrup

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General Information

Contains

Marketer

Storage

Product introduction

Uses of Feldex Syrup

Benefits of Feldex Syrup

Side effects of Feldex Syrup

How to use Feldex Syrup

How Feldex Syrup works

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Frequently asked questions

What is Feldex Syrup?

Can the use of Feldex Syrup cause dryness in mouth?

Can the use of Feldex Syrup cause dizziness?

Can the use of Feldex Syrup cause diarrhea?

Can the use of Feldex Syrup cause nausea and vomiting?

What is the recommended storage condition for Feldex Syrup?

Fact Box

Habit Forming

Therapeutic Class

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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