是ta-blockers are a group of medicines that are used to treat a variety of conditions related to your heart.
What do beta-blockers do?
是ta-blockers are a group of medicines that slow your heart rate and lower your blood pressure, making it easier for your heart to pump blood. They are used to treat a variety of conditions related to your heart such as:
- control of heart rhythm disorders (atrial fibrillation)
- to treat心脏衰竭
- to lower the chance of anotherheart attack(myocardial infarction) if you've already had one
- to treat高血压.
- reducing symptoms ofanxietysuch as fast heart rate
The following animation describes how beta-blockers work in the body (British Heart Foundation)
There are several beta-blockers and each is a bit different. Your doctor will advise which one is best for you.
Precautions before taking beta-blockers
- Do you have low blood pressure?
- Do you have very slow heart rate?
- Are pregnant or breastfeeding?
If so, it’s important that you tell your doctor or pharmacist before you start beta-blockers. Sometimes a medicine isn’t suitable for a person with certain conditions, or it can only be used with extra care.
How to take beta-blockers
When you first starting taking a beta-blocker, your doctor will start you on a low dose then slowly increase it over a few weeks. It can take a while for you to feel better – usually a few months.
Do not suddenly stop taking your beta-blocker
What are the side effects of beta blockers?
When you first start taking a beta-blocker or get your dose increased you may feel tired or have other side effects for a few days. These side effects usually slowly go away with time.
If you have diabetes you need to take extra care to measure your blood glucose levels regularly.
- 是ta-blockers can cause an increase in blood glucose levels, especially when you first start taking them. This effect usually settles with time.
- 是ta-blockers may reduce the warning signs of a low blood sugar level (hypoglycaemia – often called a hypo). For example, you may not have the feeling of fast, irregular or strong heartbeats (palpitations) or tremor, which can occur when your blood glucose is going too low. If you are worried about this, talk to your doctor. Do not stop taking your beta-blocker without checking with your doctor first. Read more abouthypoglycaemia.
If you have asthma, taking a beta-blocker may trigger your asthma symptoms or make them worse. Not everybody with asthma is sensitive to these medicines.如果您担心这一点，请与您的医生交谈。他们可能能够开一些不同的药物或增加预防药物的剂量。不要突然停止在不先与医生交谈的情况下接您的β受体阻滞剂。这可能是危险的，使您感到不适。阅读更多有关medicines that may trigger asthma symptoms.
Other possible side effects
These are quite common when you first start taking a beta-blocker, and usually go away with time.
If you get any of these symptoms:
|Tell your doctor immediately or ring HealthLine 0800 611 116.|
Additional resources for healthcare professionals
β受体阻滞剂不再是简单高血压的第一行Goodfellow Unit, NZ
Guide for initiation and up-titration of beta-blockers for patients with heart failureSaferx，NZ，2017年