When managing your or your family’s health, including pain management, always start with a conversation with your pharmacist or doctor and read your medicine instructions.
A side effect is a secondary, unwanted reaction to taking medicine. It may come as a surprise, but all medication has the potential to cause side effects - including well-tolerated painkillers like paracetamol.1
Painkillers can be an effective way to relieve many forms of discomfort – they can help us to feel better and carry on with our daily activities as usual. But in the same way that medicine has potential to help, we also need to be aware of the risks of harm, however mild or rare the side effects may be.
By learning the possible side effects of paracetamol and other medication you may be taking, you’ll know what to do if you get them. Keep reading to find out more about side effects and how they’re classified, as well as a deep dive into the effects of paracetamol and other common household painkillers.
Some medicines carry a higher chance of side effects, while others are less risky. For example, some antibiotics carry approximately a 5% chance of allergic reactions2, which would be classed by the World Health Organisation as a ‘common side effect’.
To help us understand the chance of experiencing side effects, medicines are classified in groups, depending on the likelihood of a side effect occurring3:
Very common | 1/10 chance |
Common | Between 1/10 and 1/100 |
Uncommon | Between 1/100 and 1/1000 |
Rare | Between 1/10000 and 1/1000 |
Very rare | Less than 1/100000 chance |
Some personal factors can increase an individuals chance of experiencing side effects from their medication. Risk factors may include4:
Your doctor might ask you some questions before prescribing or recommending painkillers to determine whether you have any of these risk factors. Before taking over-the-counter medicine, it’s recommended to speak with your pharmacist to discuss the possible side effects and what to do if you get them. Always read the product leaflet before use.
Paracetamol is generally well tolerated when used as directed.5 Like all medications, paracetamol can have side effects, but not everybody gets them. A small number of people have had side effects. You should stop taking paracetamol and speak to your doctor immediately if you experience any of these side effects:
Most people can take paracetamol to treat aches and pains, but if you fall into any of the below groups, you may be at increased risk of experiencing adverse effects from this painkiller: 7
You should always talk to your doctor before taking paracetamol if you:
You should not take paracetamol if you are allergic to paracetamol or any of the other ingredients in the product.
If you’re pregnant or breastfeeding, it’s recommended to seek medical advice before taking paracetamol. The lowest effective dose and shortest duration of treatment should be considered.
Have you taken more than 4000mg in 24 hours? Call your healthcare provider immediately for more support.8 Call 999 or visit your nearest A&E or emergency doctor assistance.
Diclofenac is a pain relief medicine available in the form of tablets, gels, plasters, and more.
Common side effects associated with oral diclofenac use include:
Topical diclofenac (available as a medicated gel or plaster) is less likely to cause side effects, which is why you can usually buy this treatment over-the-counter, whereas diclofenac tablets might need to be prescribed by your doctor, depending on the formulation. That being said, topical diclofenac still has potential to cause side effects, including skin irritation and sensitivity to sunlight. 10
Most adults can take diclofenac as an effective form of pain relief for aches, pains, swelling, and stiffness of the joints.
Children can take diclofenac, but age restrictions are dependent on the formulation. It’s important to always read the product labeling to determine if it is appropriate for children and adolescents. Effective treatment is dependent on their age and the type of medicine e.g topical gel or tablets. For example, diclofenac gel is only suitable for children above the age of 12.11
Check the instruction leaflet or speak to your doctor before treating your little one with diclofenac.
Always discuss the best treatment options with your doctor before taking any pain relief medication when pregnant. Do not use if you are in the last 3 months of pregnancy, as it could harm your unborn child or cause problems at delivery.12
Taking diclofenac can result in adverse effects for some people. Before taking oral diclofenac you should talk to your doctor if you:
If you are using topical diclofenac do not apply it to skin with conditions such as cuts, open wounds, or on skin that has a rash or eczema. If you develop a skin rash after applying the product discontinue use.
In a perfect world, medication would be free of any risks but ultimately all medication has some risk of side effects for some people. While there might not be any painkillers without side effects, but there are options with lower risks that could work for you depending on your health status or any underlying conditions you may have.
This is why it is important to read the product information and talk to your doctor about the right choice of painkiller for you. For example, paracetamol might be the best option for people cannot tolerate NSAIDs, such as diclofenac, due to stomach issues.
By taking the right dose of medicine at the right times, you can help to reduce the chance of experiencing unwanted effects. Click the link for more help on finding the right medicine dosage for you.
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1 Medicine and Side Effects, Health Direct, https://www.healthdirect.gov.au/medicine-and-side-effects, accessed 26/07/2021
2 Medicines and Side Effects, Better Health, https://www.betterhealth.vic.gov.au/health/Conditio
ns AndTreatments/medicines-and-side-effects accessed 26/07/2021
3 Definitions, World Health Organisation, https://www.who.int/medicines/areas/quality_safety/safety_e
fficacy /trainingcourses/definitions.pdf, accessed 26/07/2021
4 Risk factors for adverse drug reactions, MSD Manuals, https://www.msdmanuals.com/en-gb/home/drugs/adverse-drug-reactions/risk-factors-for-adverse-drug-reactions, accessed 26/07/2021
5 Paracetamol for Adults, NHS, https://www.nhs.uk/medicines/paracetamol-for-adults/, accessed 26/07/2021
6 Paracetamol, GDS 2017: p52,53
7 Paracetamol, NHS Inform | https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/paracetamol accessed 25.08.2021
8 Paracetamol, Drugs.com, https://www.drugs.com/paracetamol.html accessed 26/07/2021
9 Diclofenac, NHS, https://www.nhs.uk/medicines/diclofenac/, accessed 26/07/2021
10 Topical Diclofenac GDS v 4.0
11 Topical Diclofenac GDS v 4.0
12 Diclofenac, Drugs.com, https://www.drugs.com/pregnancy/diclofenac.html accessed 26/07/2021
13 Oral Diclofenac GDS – P22
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