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How to find out about side effects of medicines and medications What are the medicine’s side effects?
When you are trying to decide whether a medicine is right for you, you might want to know its potential side effects. Here are some pointers to understanding the side effects of your medicine.
Contents
What are the medicine's side effects?
- Questions to ask about side effects
- Video: What I need to know about medicine side effects
- Where can I get information about side effects?
- How common are the medicine’s side effects?
- Are there any serious side effects?
- Can I do anything to reduce or avoid the side effects?
- Can I do anything to avoid interactions?
- Will the side effect get better with time?
- What should I do if I am worried about a side effect?
- Adverse Medicine Events line
- Video: How to deal with your medicine’s side effects
FAQs
Story
When you’re trying to decide if a medicine is right for you, you might want to know its potential side effects. Side effects, also called adverse reactions, are the unintended effects of a medicine.
Side effects are one kind of ‘risk’ or unwanted effect. Others are:
- interactions with other medicines or food
- the medicine not having the desired effect.
Sometimes medicines have good side effects. For example, the diabetes medicine metformin (e.g. Glucophage) has the good side effect of weight loss.
If you have concerns about side effects, talk to your health professional.
Questions to ask about side effects
All medicines have possible side effects, but not everybody will experience them.When finding out about side effects, important questions to ask your health professional are:
- What are the possible side effects?
- How common are the side effects?
- Are there any serious side effects and how likely are these?
- Can I do anything to avoid or reduce the side effects?
- Will the side effect get better with time?
- What should I do if I am worried about a side effect?
You then need to weigh up the risk of side effects against the benefits of the medicine — see What will the medicine do for me? and Is this medicine right for me?
Sometimes it is helpful to take notes when you are talking to your health professional. The Your medicinewise questions and answers sheet has space for you to write answers to questions about both the benefits and side effects of your medication.
If you are trying to decide between treatments, filling in the Personal decision guide for medicines may help you compare your different options.
Video: What I need to know about medicine side effects
©2011 NPS
Run time: 1:56m (23.2 MB)
Video transcript
On their website, it would’ve been great for them to list ‘Yes, there are these serious side effects — however, this is the incidence of them occurring’.
Okay, so, a doctor suggested that my daughter who was suffering from asthma — or we thought it was asthma — look at some. He suggested a drug for her to take, so I went and got the prescription for the drug and then looked at the consumer information.
One of the first things it mentioned was all medications have risks when you take them, so I thought yes, I will read the side effects and when I read them it was things like — and my daughter is 6 years old — severe anxiety, aggression, sleepwalking, nightmares, depression, anxiety, suicidal thoughts, and for something that was essentially a cough, I thought that it was a little bit extreme. So that was just looking up online on their websites, so then I tried to find some more information and, basically, it was just different companies or organisations rehashing the same sorts of information, there wasn’t really any breakdown.
So then I rang my friend who has a lot of experience with medical research, and she found some reports on particular tests on that drug and, yes, there were side effects, but they weren’t in children, and they had been a very large sample of people that had been tested, and it was a very, very small incidence of those things occurring — and, as I said, not in children. So then it put it in perspective. So without the information about how prevalent those side effects might be, it would have completely stopped me from using that medication for my daughter.
Where can I get information about side effects?
One source of information about possible side effects is the consumer medicine information (CMI) leaflet that must be produced for all prescription (and some non-prescription) medicines.
The CMI leaflet describes common and important side effects that are known about from clinical trials and ongoing monitoring of medicines by health professionals.
You may find it helpful to read the CMI leaflet then discuss any particular concerns or questions with your health professional before you buy the medicine.
You can download CMI leaflets, or you can ask your health professional for the CMI leaflet for your medicine.
Although you might be interested to hear about other people’s experiences with a medicine, remember that not everyone will have the same experience of side effects.
Be aware that if you are considering a newly approved medicine it is possible that longer-term or less common side effects may not have been discovered yet.
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Often when a health professional prescribes a new medicine you don’t have time in the consultation to think about it. |
When you get home you may think of many questions you have about the medicine. You can find some more information by downloading the CMI (Consumer medicines information) leaflet. |
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Then go back to your health professional to discuss all the questions you now have about the medicine. |
Related topics
- Just because a medicine is new, does that mean it’s better?
- What are clinical trials and why are they important?
How common are the medicine’s side effects?
It can be daunting to see all the potential side effects listed for a medicine. But not all side effects are as likely as others, and some people will not experience any side effects at all. Some are common and some are rare. Some are also more serious than others.
The terms ‘common’, ‘uncommon’ and ’rare’ have a very specific meaning when used to describe side effects for medicines in official documents such as consumer medicine information (CMI) leaflets or the product information (PI).
How often do common side effects occur?
| Term | Estimated number of people affected | Estimated % of people affected |
|---|---|---|
| Very common | At least 1 in 10 people | At least 10% of people |
| Common | Between 1 and 10 in every 100 people | Between 1% and 10% of people |
| Uncommon | Between 1 and 10 in every 1000 people | Between 0.1% and 1% of people |
| Rare | Between 1 and 10 in every 10,000 people | Between 0.01% and 0.1% of people |
| Very rare | Fewer than 1 in 10,000 people | Fewer than 0.01% of people |
Look at the visual aids below showing various rates of risk to get an idea of how likely they are.
If you don’t understand how likely a side effect is, ask your health professional to explain using words or numbers that make sense to you.
Although this sort of information can give you an idea of how often side effects occur on average, it does not tell you how likely you are to experience a particular side effect. Your individual risk of a side effect depends on several factors, including your other health issues, your age and the dose of medicine. Your health professional may be able to tell you how likely they think you are to get a certain side effect.
Are there any serious side effects?
For most medicines, the serious side effects are less common. However, even side effects that might not be considered ‘serious’ (such as nausea) might affect your ability to tolerate the medicine.
For a small number of medicines, the serious side effects are also the most common. These are prescribed only in certain situations when the benefits are likely to outweigh the potential harms.
Some chemotherapy medicines for cancer treatment have a common side effect of reducing your number of white blood cells. This would increase your risk of infection, but the benefit to you in terms of treating the cancer might far outweigh the harm of this side effect. If you were treating a less serious illness, like hayfever, the benefit wouldn’t be worth the risk of reducing your number of white blood cells.
If your medicine has a serious side effect that worries you, ask your health professional how often it happens and whether you can do anything to avoid it.
Can I do anything to avoid or reduce the side effects?
Some side effects can be avoided by following the specific instructions for that medicine. For some medicines, these instructions could include starting with a low dose and building up, taking the medicine with meals (e.g. anti-inflammatory medicines), taking it on an empty stomach (e.g. antibiotics) or taking it at a particular time of the day, or even staying out of the sun (e.g. the antibiotic doxycycline).
If you are having trouble with side effects of a medicine, talk to your health professional about it. There may be other ways to take the medicine or even other medicines that might suit you better.
Knowing whether side effects can be managed may help you when deciding whether to start new medicines.
Can I do anything to avoid interactions?
Some unwanted effects can occur because of interactions with foods, alcohol or other medicines, including vitamins, herbal or complementary medicines. Asking your health professional about the possibility of interactions with your medicine will help you avoid these. See Will it mix OK with my other medicines?
Keeping a Medicines List will make it easier for your health professional to spot potential interactions.
Will the side effect get better with time?
Some side effects get better with time. Nausea is typical of this — some medicines make you nauseous for the first few days or even weeks, but the nausea then goes away.
Other side effects do not go away, or do not occur straight away. Knowing if a side effect is long term or short term can affect your decision about whether to take a particular medicine.
What should I do if I am worried about a side effect?
Always discuss any side effects with your health professional. If there are any side effects you can’t cope with, there may be things your health professional can do to combat them, such as reduce the dose of your medicine, or switch to another treatment.
When you are finding out about side effects, remember to weigh these up against the benefits of the medicine, when you make any choices about treatment. See What will the medicine do for me?
Adverse Medicine Events line
The Adverse Medicine Events (AME) Line lets you report and discuss side effects that might be related to your medicine. The side effects of your medicine — but not your personal details — are reported to the Australian medicines regulatory agency — the Therapeutic Goods Administration (TGA). This information helps to improve the safe use of medicines. You can call the AME Line on 1300 134 237 (Mon–Fri, 9am–5pm EST).
The AME line is not for emergencies. If you have concerns about your medicines arising from an overdose or suspected poisoning, call the Poisons Information Centre, 24 hours a day on 13 11 26. For general emergencies call 000.
Video: How to deal with your medicine’s side effects
©2011 NPS
Run time: 0:53m (8.5 MB)
Video transcript
It’s important to know what your medications are doing. First of all, if you understand and you get some side effects and they are the side effects that go with the medication; for instance, an example would be constipation — which is very common in the elderly — then you probably would be able to deal with it yourself, by either going to the chemist or what you would normally do for your bowels.
That’s just one example, but if you’re feeling nauseated, it’s not a very nice feeling. If it persists, then you need to go to your doctor to find out if you continue with it, or if you need to go onto something else which may do the same thing but not have that side effect.
I’ve been a smoker for years. I started in my teens and now I’m 30. I’ve tried to quit before but it’s not easy and I’ve never been able to stop for more than a month. My partner and I want to have a baby and I’d really like to quit for good, but I’m worried. I didn’t handle it well last time.
I went to see my GP and asked if he could give me some suggestions about quitting. He was good — he told me that most people who quit smoking do it through their own willpower. It often takes a few goes but most people get there in the end. He also suggested two different medicines I could try: nicotine patches or varenicline (brand name Champix), a tablet available on prescription. The doctor said varenicline wasn’t made of nicotine, like the patches, but it was effective.
I tried nicotine patches a long time ago but they didn’t really do the job for me. I liked the sound of varenicline — something a bit different. But I wanted to know if it would help me through the withdrawal, because that would be the toughest for me.
My doctor said about one-third of people get nausea when they first start varenicline, but taking it with food and a full glass of water would help, plus it would settle down after a while. He also said that sometimes people get sleepy or dizzy.
I thought the side effects didn’t seem too bad — I could handle feeling a bit dizzy or sick for a while if it would help me stop smoking in the end. It didn’t sound much worse than what has happened before when I’ve quit: less concentration, getting cranky easily, eating more and craving smokes. Trying varenicline sounded good to me.
My doctor then asked me if I’d had any mental health issues in the past. I told him about having depression when I was living in the country. It was about six years ago and I’d had a really hard time, but I’m much better now. He told me people who have had mental illnesses in the past should be carefully monitored on varenicline, because there had been some reports of depressed moods and even suicidal thoughts or actions.
He didn’t know what my chances were of having that kind of reaction, because there wasn’t enough information right now to say if varenicline caused them for sure. He did say that not everybody on varenicline experienced these effects, and he hadn’t seen it in any of his patients — but that wasn’t many people.
Even so, that worried me. I’m hoping to have a baby soon and I definitely didn’t want to go back to those days with depression. It wasn’t a great time in my life. The nicotine patches sounded like a better option than a medicine that might bring up the depression again, however small the odds.
I told the doctor I’d rather try the nicotine patches again. I was glad that he agreed and we went through some of the common side effects of the patches: headaches, some nausea, indigestion and itchiness at the patch area. I was ready to handle these.
He also suggested that I call the Quitline for support, as we both knew the first few weeks are the hardest. That sounded like a really good idea to me. He told me that patches work best when you use them with support to quit smoking, and told me to make an appointment to come back a few weeks after my ‘quit date’.
Between the nicotine patches and the counselling support, I hope I can quit for good. I know what to expect and I know I can get help in dealing with the cravings and any side effects I might get. I’m hoping to be free of smokes soon.
This is a fictional account for educational purposes.
For more information on varenicline, see Medicine Update: Varenicline (Champix) for quitting smoking.
Date published: 2011-01-24 00:00:00
Reasonable care is taken to provide accurate information at the date of creation. This information is not intended as a substitute for medical advice from a qualified health professional. Health professionals should rely on their own expertise and enquiries. Where permitted by law, NPS disclaims all liability (including for negligence) for any loss, damage or injury resulting from reliance on or use of this information. Read our full disclaimer.
References to brands should not be taken as an endorsement by NPS.
