Used for: Bone diseases, Paget's disease, Osteoporosis
Chinese name:

What is Fosamax?

Fosamax is a brand product that contains Alendronate, which belongs to a class of drug known as bisphosphonates. It works by slowing down the rate of bone turnover, so the bone mineral density increases. Fosamax is used for osteoporosis.

How to use it?

Fosamax is available as tablets only. It is taken in the morning at least 30 minutes before the first food or drink, unless it is water, while sitting upright. 

For osteoporosis, take 70 mg once weekly.

What are the side effects of Fosamax?

Common side effects of Fosamax include stomach pain and discomfort, constipation, throat irritations and headache.

Who should not take Fosamax?

  • Anyone who is allergic to any component of Fosamax.
  • Patients with low calcium levels.
  • Patients with abnormalities of the oesophagus.
  • Patients who are unable to stand or sit upright for at least 30 minutes.
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Where to buy Fosamax in Hong Kong?

In Hong Kong, Fosamax 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

Need more information?

For detailed information about the use of Fosamax 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
  • 70mg (Tablets)
Drug class
Antiresorptive Agents
Sub class
Generic Names
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