Medicines & Supplements A to Z > Famotidine


Last updated on June 26, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Famotidine



What is Famotidine for?

Famotidine belongs to a class of medications called histamine-2 blockers. It works by suppressing the secretion of stomach acid and hence can be used to treat several gastrointestinal disorders, including benign gastric and duodenal ulceration, gastroesophageal reflux disease (GERD), heartburn, and non-ulcer dyspepsia.

How to use it?

Famotidine can be taken orally. The adult dosages are as follows:

For the treatment of benign gastric and duodenal ulceration, you should take 40 mg once daily at night for 4 to 8 weeks. The maintenance dose is 20 mg once daily at night.

For the treatment of GERD, you should take 20-40 mg twice daily for 6 to 12 weeks. The maintenance dose is 20 mg twice daily.

For the treatment of heartburn or non-ulcer dyspepsia, you should take 10 mg once or twice daily.

For mild symptoms, Famotidine can be taken on an intermittent basis (as needed) 10-60 minutes before a meal that you expect to cause heartburn.

What are the side effects of Famotidine

Common side effects of Famotidine include diarrhoea, fatigue, and headache.

Where to buy Famotidine in Hong Kong?

In Hong Kong, Famotidine 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

For detailed information about the use of Famotidine 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.