> Western Medicines > Diprophylline

What is Diprophylline for?

Diprophylline belongs to a class of medications called phosphodiesterase inhibitors. It can relax the smooth muscle of the airways and stop the airways from reacting to external stimuli. Diprophylline is used to treat asthma and chronic obstructive pulmonary disease.

How to use it?

In Hong Kong, Diprophylline is taken orally as syrup, tablets or injections injected through the muscles, but seldom used due to the associated intense pain. It should be taken on an empty stomach for not within 1 hour before or after meals, together with a cup of water.


Reversible airflow obstruction
Adult and elderly
200-400 mg every 6 hours.

What are the side effects of Diprophylline?

Common side effects of Diprophylline include gastric and intestinal irritation, headache, restlessness, dizziness and tremor.

Who should not take Diprophylline?

Pharmacist Tips:

  • Stop smoking while you are on this medication.
  • For asthma patients, know what triggers your asthma and avoid them.
  • Regular exercise at a moderate intensity.

Common dosing schedule:
Oral Diprophylline is taken every 6 hours with a cup of water on an empty stomach not within 1 hour of meals.


Diprophylline injections are prescribed in institutions by the physicians.


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


Some common medications Diprophylline may interact with:

  • Probenecid
  • Xanthines, e.g. Aminophylline, Caffeine, Theobromine

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

Where to buy Diprophylline in Hong Kong?

In Hong Kong, Diprophylline tablet is an over-the-counter medicine and can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. 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.


In Hong Kong, Diprophylline injection 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 Diprophylline 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
Available dosage
  • 100mg/5ml (Syrup)
  • 300mg/2ml (Injections)
  • 100mg / 200mg (Tablets)
Drug class
Sub class
Phosphodiesterase Inhibitors
Alternative Names
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