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Feldex Syrup

Written By Dr. Swati Mishra, BDS
Reviewed By Dr. Rajeev Sharma, MBA, MBBS
Last updated on 10 Apr 2026 | 12:30 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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The content is shown in English
Feldex Syrup image
Feldex Syrup image

Product introduction

Feldex Syrup can be 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. Let your doctor know about all other medications you are taking, as some may affect, or be affected by, this medicine.


There is limited data available regarding the common side effects of this medicine. It may cause a few side effects, such as nausea, stomach upset, diarrhea, stomach pain, and vomiting in some people. Most of these are temporary and usually resolve with time. Contact your doctor if you are at all concerned about any of these side effects. This medicine may also cause dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you.


Never support self-medication or recommend your medicine to another person. Drink plenty of fluids while taking this medication to maintain hydration. Before you start taking Feldex Syrup, 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 : Feldex Syrup helps relieve coughs associated with mucus buildup or throat irritation, such as in the common cold, allergies, or respiratory infections.

Benefits of Feldex Syrup

Treatment of Cough
Feldex Syrup is a combination medicine that helps relieve cough and associated symptoms. It works by thinning and loosening thick mucus, making it easier to cough out, and clearing the airways. It also helps suppress excessive coughing and relieves allergy symptoms such as sneezing, runny nose, watery eyes, and throat irritation. This improves breathing and provides overall comfort, helping you carry out 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

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

Quick tips

  • Feldex Syrup may cause dizziness or sleepiness, so avoid driving or operating machinery until you know how it affects you.
  • Avoid alcohol or other sedating medicines while taking Feldex Syrup, as they may increase drowsiness.
  • Do not combine Feldex Syrup with other cough or cold medicines unless advised by your doctor to avoid overdosing on specific components in your medicine.
  • Dry mouth or constipation may occur; drinking water and maintaining adequate fiber intake may help.
  • If you are diabetic, your doctor may recommend regular monitoring of your blood glucose levels while using Feldex Syrup.
  • Inform your doctor if you have a history of thyroid disease, heart disease, glaucoma, or urinary problems before taking Feldex Syrup.
  • Avoid exposure to cigarette smoke or secondhand smoke, as it can worsen cough and airway irritation.
  • Seek medical attention if you develop a high fever, chest pain, breathlessness, or cough up blood.
  • Stop taking Feldex Syrup and consult your doctor if your cough lasts longer than about a week, keeps recurring, or occurs with fever, rash, or persistent headache.

Safety advice

Alcohol

Alcohol

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

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

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

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

Kidney

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

Liver

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

Frequently asked questions

Feldex Syrup is used to relieve symptoms of cough and cold, such as throat irritation, mucus buildup (phlegm), runny nose, and sneezing. It contains a combination of medicines that help loosen mucus, reduce coughing, and control allergy symptoms. Thinning and clearing mucus and calming the cough reflex help make breathing and coughing more comfortable. It should be used only as advised by a doctor.
Feldex Syrup syrup may cause side effects in some people, although many tolerate it well. Common effects include dry mouth, dizziness, nausea, vomiting, diarrhea, stomach upset, or drowsiness. Drinking plenty of fluids and eating light meals may help reduce stomach discomfort. Stop using Feldex Syrup and contact a doctor immediately if you develop severe rash, breathing difficulty, persistent vomiting, fainting, unusual sleepiness, or if symptoms worsen instead of improving.
Feldex Syrup is often easier on the stomach when taken after food, though the exact timing should follow your doctor’s advice. Taking it on an empty stomach may sometimes worsen acidity or stomach discomfort. Avoid very spicy or oily meals if they aggravate symptoms while using Feldex Syrup. If food timing is unclear, check with your doctor.
Feldex Syrup should be used only as advised by your doctor. Many cold and cough medicines contain similar ingredients, so combining them without medical advice may lead to duplicate doses and increased side effects. Always show your doctor or pharmacist all medicines you are taking before adding another product.
If you miss a dose of Feldex Syrup, take the next scheduled dose at the usual time unless your doctor has advised otherwise. Do not take two doses together to make up for the missed dose. If missed doses occur frequently, speak with your doctor about simplifying the dosing schedule.
Feldex Syrup should be given to children only if a doctor has recommended it for that child. The correct dose depends on the child’s age, weight, and illness. Monitor the child after giving the medicine and seek medical advice if the child becomes very sleepy, breathless, refuses feeds, or develops a rash.
Drinking water after taking Feldex Syrup syrup is generally acceptable unless your doctor has advised otherwise. Staying hydrated can help soothe throat irritation and support recovery during cough and cold.
Whether Feldex Syrup is suitable for wet cough depends on its ingredients and your symptoms. Some cough medicines help loosen mucus and make it easier to cough out, while others suppress the cough reflex. Your doctor will decide whether Feldex Syrup is appropriate based on the type of cough and your overall condition.

Fact Box

Habit Forming

No

Therapeutic Class

RESPIRATORY
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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.

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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

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Country of origin: India
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