> Western Medicines > Erythromycin


Used for:Pneumonia, Acne, Skin infection, Respiratory tract infections, Other bacterial infections, Pertussis / whooping cough
Chinese name:

What is Erythromycin for?

Erythromycin is a macrolide antibiotic like Azithromycin, and is used for treating bacterial infections, including but not limited to the following:

  • Acute otitis media (ear infection)
  • Respiratory tract infections
  • Pertussis (Whooping cough)
  • Skin and soft tissue infections
  • Acne
  • Other susceptible infections

How to use it?

Erythromycin can be taken by mouth or applied to the skin. The dosages for different uses and age groups are listed below:


For acute otitis media (ear infection)

By mouth

Child 1-23 months

125 mg 4 times daily for 5-7 days OR 250 mg twice daily for 5-7 days.


Child 2-7 years

250 mg 4 times daily for 5-7 days OR 500 mg twice daily for 5-7 days.


Child 8-17 years

250-500 mg 4 times daily for 5-7 days OR 500-1000 mg twice daily for 5-7 days.


For acne (in adults)

By mouth

Start with 250 mg daily and may increase up to 500 mg twice daily.


To the skin using 2-4% solution / gel / ointment

Apply to the affected areas 1-2 times daily for a maximum duration of 6 months. If your conditions worsen or show no improvement after 6-8 weeks of use, you should tell your doctor and discontinue the treatment.


For respiratory tract infections / skin and soft tissue infections / other susceptible infections


1-2 g daily in 2-4 divided doses and may increase up to 4 g daily in severe cases. You should take the dose that is above 1 g in more than 2 divided doses.



30-50 mg/kg daily in 2-4 divided doses and may double the dose in severe cases.

What are the side effects of Erythromycin?

Common side effects of Erythromycin include decreased appetite, diarrhoea, gastrointestinal discomfort, nausea, and vomiting.

Who should not take Erythromycin?

  • Anyone who is allergic to Erythromycin or other macrolide antibiotics.

Pharmacist Tips:

  • Do not take Erythromycin with milk or acidic beverages such as fruit juice.
  • Complete the full course of antibiotic treatment as directed by your doctor or pharmacist.

Common dosing schedule:
You should take Erythromycin on an empty stomach (about 2 hours before or after a meal) with a full glass of water.

If you experience any extreme gastrointestinal upset, you may take the drug with food.


This schedule is for reference only, adjustments may be made according to individual needs.


Some common medications Erythromycin may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Erythromycin in Hong Kong?

In Hong Kong, Erythromycin is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.


For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk

Need more information?

For detailed information about the use of Erythromycin in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.

Brands in Hong Kong
Aknemycin Plus
Available dosage
  • 125mg/5ml (Oral Suspension)
  • 250mg / 500mg (Tablets)
Drug class
Sub class
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Used for:Community-acquired pneumonia, Uncomplicated genital chlamydial infections, Pertussis / whooping cough, Skin and soft tissue infections, Gonorrhea, Respiratory tract infections, Otitis media
Chinese name:
Used for:Otitis media, Gonorrhea, Uncomplicated genital chlamydial infections, Community-acquired pneumonia, Respiratory tract infections, Skin and soft tissue infections, Pertussis / whooping cough
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Dalacin T
Used for:Acne
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Used for:Other bacterial infections, Respiratory tract infections, Helicobacter pylori (H. pylori) eradication, Skin infection, Pneumonia
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