Dynadryl Cough Syrup

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Manufacturer Dyna
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Dr. Mohd Izzat Amir Bin Awang
Reviewed byDr. Mohd Izzat Amir Bin AwangDoctor of Medicine (MD), University of Mansoura - Manchester
Dr. Adeline Carol Peters
Written byDr. Adeline Carol PetersBachelor of Medicine and Bachelor of Surgery (MBBS) — Manipal Academy of Higher Education (MAHE)

Last updated:

Overview

Dynadryl Cough Syrup is a prescription-only medicine (POM) presented as a syrup, with Diphenhydramine hydrochloride 14mg per 5ml, Sodium citrate 57mg per 5ml and Ammonium chloride 135mg per 5ml as its active ingredient content.

This page is limited to product, safety and handling information, in line with Malaysian rules on prescription medicine information for the public. Your prescriber or pharmacist is the right source for anything beyond that, together with the leaflet inside the pack.

Through DoctorOnCall, this product is supplied after an online consultation with a licensed doctor and a valid prescription, and it is checked by a registered pharmacist before dispensing. Take it exactly as prescribed, and speak to your doctor before stopping, changing the dose, or starting any other medicine alongside it.

Directions for Use

Shake Dynadryl Cough Syrup well before use and measure the exact dose with the oral syringe or measuring cup provided rather than a household spoon. It can be taken with or without food. Avoid driving or operating machinery after taking this medicine, as it can cause drowsiness.

Dosage

The dose of Dynadryl Cough Syrup depends on age and is determined by your doctor, taken using the measuring device provided, usually several times a day as directed. Do not exceed the dose or frequency prescribed, and do not use for longer than advised, as this is a symptomatic treatment rather than a cure for the underlying cold or infection.

Storage Instructions

Store below 30°C in a dry place, away from direct sunlight and out of reach of children.

Side Effects

Ammonium Chloride + Diphenhydramine

  • Drowsiness or dizziness
  • Dry mouth or throat
  • Nausea or stomach upset
  • Headache
  • Blurred vision
  • Mild constipation

Ammonium Chloride

  • Nausea or vomiting
  • Abdominal discomfort
  • Headache
  • Fatigue or weakness
  • Irritability or confusion (with high doses)
  • Metabolic acidosis (in rare or prolonged cases)

Contraindications

  • Known hypersensitivity to diphenhydramine or any ingredient in this product
  • Angle-closure glaucoma
  • Severe urinary retention or significant prostate enlargement (benign prostatic hyperplasia)
  • Severe kidney impairment (ammonium chloride requires caution)

Drug / Food Interactions

  • Alcohol significantly increases the sedative effect and should be avoided
  • Other antihistamines or sedating medicines (e.g. sleep aids, some antidepressants) can add to drowsiness and anticholinergic effects if combined
  • MAOI antidepressants may prolong and intensify the anticholinergic effects of diphenhydramine

Quick Tips

  • Avoid driving or operating machinery after taking this medicine due to drowsiness
  • Avoid alcohol while taking this medicine, as it increases sedation
  • Do not combine with other diphenhydramine- or antihistamine-containing products, as this can lead to excess sedation or anticholinergic overload
  • Use caution if you have glaucoma, urinary retention, or an enlarged prostate, as this medicine can worsen these conditions
  • Shake well before each use and measure the dose accurately

Ingredients / Active Ingredients

  • Diphenhydramine hydrochloride 14mg per 5ml
  • Sodium citrate 57mg per 5ml
  • Ammonium chloride 135mg per 5ml

Safety Advice

Ammonium Chloride + Diphenhydramine

Pregnancy

Use With Care

This medicine should be used cautiously during pregnancy. Monitoring may be required.

Breastfeeding

Use With Care

Use with caution. Monitor infant for potential adverse reactions.

Kidney

Use With Care

Use cautiously. Dose adjustment or monitoring may be required.

Liver

Use With Care

Use cautiously. Liver function monitoring may be required.

Alcohol

Use With Care

Caution is advised when consuming alcohol with this medicine.

Driving

Not Advisable

It is not advisable to drive if you experience side effects from this medicine.

Ammonium Chloride

Pregnancy

Safe If Prescribed

This medicine should only be used during pregnancy if prescribed by a doctor after careful evaluation.

Breastfeeding

Use With Care

Use with caution. Monitor infant for potential adverse reactions.

Kidney

Not Advisable

Not generally recommended in patients with kidney disease.

Liver

Use With Care

Use cautiously. Liver function monitoring may be required.

Alcohol

Use With Care

Caution is advised when consuming alcohol with this medicine.

Driving

Use With Care

Use caution while driving until you know how this medicine affects you.

Frequently Asked Questions

Product Specifications

ManufacturerDyna
ClassificationPrescription medicine
Ingredients / Active IngredientsAmmonium Chloride + Diphenhydramine, Ammonium Chloride
Volume100ml
Shelf LifeUse this product before the expiry date stated on the packaging. Do not use the medicine if the expiry date has passed.

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Important Medical Information

💊 Recommended Dosage:

The dose of Dynadryl Cough Syrup depends on age and is determined by your doctor, taken using the measuring device provided, usually several times a day as directed. Do not exceed the dose or frequency prescribed, and do not use for longer than advised, as this is a symptomatic treatment rather than a cure for the underlying cold or infection.

🛑 Contraindications (Do not use if):
  • Known hypersensitivity to diphenhydramine or any ingredient in this product
  • Angle-closure glaucoma
  • Severe urinary retention or significant prostate enlargement (benign prostatic hyperplasia)
  • Severe kidney impairment (ammonium chloride requires caution)
If you are unsure, please chat with us or consult your doctor.
⚠️ Common Side Effects:
Ammonium Chloride + Diphenhydramine:
  • Drowsiness or dizziness
  • Dry mouth or throat
  • Nausea or stomach upset
  • Headache
  • Blurred vision
  • Mild constipation
Ammonium Chloride:
  • Nausea or vomiting
  • Abdominal discomfort
  • Headache
  • Fatigue or weakness
  • Irritability or confusion (with high doses)
  • Metabolic acidosis (in rare or prolonged cases)
Stop taking this medication immediately and consult your doctor if you experience severe allergic reactions or side effects.
IMPORTANT: Unsure? Chat with our pharmacists (Mon - Sat, 9:00am - 6:00pm) before buying.