> Western Medicines > Hydrosil

What is Hydrosil?

Hydrosil is a brand medication that contains Aluminium Hydroxide, Magnesium Hydroxide and Simethicone. Aluminium Hydroxide and Magnesium Hydroxide together work as antacid to neutralise acid in the stomach, and Simeticone works by preventing foaming due to excessive acid. It is therefore used in the treatment of heartburn and gastroesophageal reflux disease (GERD).

How to use it?

Hydrosil is available as chewable tablets. 


For heartburn and gastroesophageal reflux disease (GERD), chew 2–4 tablets when required, usually in–between meals and before bed on an empty stomach.

What are the side effects of Hydrosil?

Common side effects of Hydrosil include stomach irritation. It will go away usually after a few hours of taking Hydrosil.

Who should not take Hydrosil?

  • Anyone who is allergic to any component of Hydrosil.
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Where to buy Hydrosil in Hong Kong?

In Hong Kong, Hydrosil 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.  

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 Hydrosil 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.

Available dosage
  • (Chewable Tablets)
Drug class
Acid-Reducing Drugs
Sub class
Generic Names
Magnesium Hydroxide
Other drugs in same class
Calcium Carbonate
Used for: Dyspepsia / Indigestion, Gastroesophageal Reflux Disease (GERD), Low blood calcium levels, Heartburn, Reducing blood phosphate levels in chronic kidney disease
Chinese name:
Sodium Bicarbonate
Used for: Urine alkalinization, Heartburn, Dyspepsia / Indigestion, Gastroesophageal Reflux Disease (GERD), Infantile colic, Metabolic acidosis
Chinese name: