Medicines & Supplements A to Z > Betaloc


Last updated on 19/10/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Metoprolol


DRUG CLASS: Antihypertensives, Antianginal agents

SUB CLASS: Beta-blockers

USED FOR: High blood pressure, Angina, Myocardial infarction, Heart failure, Irregular heartbeat

– 50mg, 100mg (tablets)
– 25mg, 50mg, 100mg, 200mg (prolonged-release tablets)
– 1mg/ml (injection)

What is Betaloc for?

Betaloc is a brand product that contains Metoprolol, which is known as a beta-blocker. It works by slowing down the activity of your heart and blood vessels. It is therefore used for different heart problems, such as high blood pressure, angina, irregular heartbeat and heart attack. 

Besides, Betaloc ZOK, which is an prolonged-release formulation, can be used to treat heart failure.

How to use it?

Betaloc is available as conventional tablets or prolonged-release tablets. For prolonged-release tablets, do not chew or crush them.

For hypertension
Conventional tablets: starts with 50 mg twice daily, and can be increased at weekly intervals as needed. Usual dose range is 100-200 mg daily in 2 divided doses.
Prolonged-release tablet: starts with 25-100 mg once daily, and can be increased at weekly intervals as needed. Usual dose range is 50-200 mg once daily.

For angina
Conventional tablets: starts with 50 mg twice daily, and can be increased at weekly intervals as needed. Usual dose range is 50-200 mg twice daily.
Prolonged-release tablet: starts with 100 mg once daily, and can be increased at weekly intervals as needed. 

For heart failure with reduced ejection fraction
Prolonged-release tablet: starts with 12.5-25 mg once daily, and double the dose every 2 weeks to highest tolerated dose or up to 200 mg daily.

For myocardial infarction (heart attack)
Starts with 25-50 mg conventional tablets every 6-12 hours, then transits in 2-3 days to prolonged-release tablets and titrates to 200 mg once daily as tolerated.

For arrhythmia (irregular heart beat)
Conventional tablets: 25-100 mg twice daily.
Prolonged-release tablet: 100-200 mg once daily.

What are the side effects of Betaloc?

Common side effects of Betaloc include slow heartbeat, depression, dizziness, shortness of breath, erectile dysfunction, and fatigue.

Who should not take Betaloc?

– People who are allergic to Metoprolol, or beta-blockers, or any component of the formulation.
– Patients with low blood pressure, slow heart rate, and second- or third-degree heart block

Pharmacist Tips:

– Betaloc may mask the symptoms of low blood glucose. Monitor your blood sugar level regularly.
– The first dose may cause some drowsiness. Sit down and move slowly after taking the first dose.
– Continue taking Betaloc even when you feel well.

Common dosing schedule:
Betaloc is taken twice daily, in the morning and evening, with or immediately after a meal.

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

Some common medications Betaloc may interact with:
– Insulin
– Clonidine
– Antidepressants, e.g. Bupropion, Paroxetine, Fluoxetine
– Calcium Channel Blockers, e.g. Amlodipine, Verapamil

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

Where to buy Betaloc in Hong Kong?

In Hong Kong, Betaloc 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 Betaloc 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.