Side effects | Cancer Institute NSW

In Australia, the Therapeutic Goods Administration (TGA) (Opens in new tab) is responsible for monitoring the safety of medicines.
When a medicine is first made available, information about its safety and function comes from clinical trials. While these clinical trials report information about possible problems and side effects, not all the possible problems can be identified.
By reporting a problem that you have with your medicine, you help monitor its safety.
The types of medicines and equipment you can report on to the TGA include:
Potential problems with medicines may include adverse events, packaging or handling issues, as well as counterfeit products.
A medicine or vaccine can sometimes cause unintended or unwanted effects, called 'adverse events'. These may include signs, symptoms or a disease that happens during or after using the medicine or vaccine.
Adverse events include unintended side effects, called adverse drug reactions or adverse effects. Common and known side effects are listed in the Consumer Medicines Information (CMI) for each medicine. Some side effects are more likely than others. You may not experience any side effects at all.
Adverse events can also involve problems or accidents with medical devices used to deliver a medicine. For example, an insulin injection device. Problems may include:
Not all adverse events happen because of a problem with the medicine or medical device itself. They can also be caused by:
It is possible for your medicine to interact with another medicine you may be taking. This can affect the way they work or how you react to them. Certain foods or drinks can also interact with medicines and lead to an adverse event.
Possible problems include any defects that may happen during the manufacture or distribution of a medicine. Issues may involve an entire batch or a single package of the medicine. These defects can affect their:
Defects may include:
Packaging problems may lead to confusion when purchasing a medicine. Generic-looking packaging or medicines with similar-sounding names can lead to medicine mix-ups and errors when selecting your medicine.
Counterfeit medicines and medical devices are products that may look like the real product but may:
Counterfeit products can be harmful and may not work as intended. Issues may also arise from misleading advertising or claims made by a manufacturer. Learn how to spot a fake medicine (Opens in new tab).
If you experience side effects, notice a problem or have concerns about your medicine or medical device:
For non-emergency situations, you can:
If you are having any problems with a medicine, it's a good idea to tell your doctor or pharmacist about it. They can help if you're experiencing an adverse event. It may be needed to:
Your doctor or pharmacist can report the problem to the TGA for you. Your personal information will stay confidential and your privacy will be respected.
They will also update your personal health records with information about any reactions or side effects you've had.
You can report a problem with a medicine directly to the TGA. They monitor the safety of medicines, including adverse events. The TGA can then ensure this information is available to healthcare professionals and people who take the medicine.
Reports can be made by anyone, including:
You do not need to be certain that you have a problem or are experiencing an adverse event. Suspected adverse events are also encouraged to be reported.
The TGA investigates these reports and publishes the findings in the Database of Adverse Event Notifications (DAEN) (Opens in new tab).
When you report a problem, it's a good idea to keep any packaging, prescriptions or documents that came with the medicine. Make note of details, such as:
It is also important to keep notes about your experience with the medicine. Consider taking photos of the product and your symptoms. Important details to include are:
The TGA has introduced the Black Triangle Scheme (Opens in new tab). A black triangle symbol appears on documents related to a newly released medicine or a medicine being used in a new way. This serves a reminder that you should monitor and report any problems that may happen when you take the medicine.
The black triangle does not mean there are concerns or known safety problems with the medicine. Sometimes, an adverse event will not happen during the product's clinical trials. They may only be noticed and monitored as the medicine is used by more people once it has been released.
You will see this black triangle on medicine information documents for newer medicines.

You will see this black triangle on medicine information documents for newer medicines.
Find out more about reporting a problem with a medicine from:
If you have a question about your medicine, call the Medicines Line (Opens in new tab) on 1300 MEDICINE (1300 633 424) and speak to a pharmacist.
The TGA (Opens in new tab) uses an upside-down black triangle to encourage reporting of any problems with new medicines. If a medicine has a black triangle, you will find it in the medicine's CMI.
You can also call the healthdirect helpline on 1800 022 222 (Opens in new tab) (known as NURSE-ON-CALL in Victoria). A registered nurse is available 24 hours a day, 7 days a week.
If you speak a language other than English, you can use the Translating and Interpreting Service (TIS National) (Opens in new tab) to report problems with a medicine.
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Last reviewed: November 2024










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