Pharmacovigilance is the science and practice of monitoring medicines for unwanted effects after they have been approved and are in everyday use. In plain terms: it is how we keep learning about a medicine once real people start taking it.
It exists because of a gap that no amount of pre-approval testing can close. Clinical trials run for a limited time, involve a limited number of people, and deliberately exclude many of the people who will later take the medicine, including older adults, children, pregnant women and people with several conditions at once. A trial of a few thousand people cannot reliably detect an effect that occurs in one in ten thousand, and a trial lasting a year cannot detect an effect that takes five years to appear.
Quick answer: when and how to report a suspected side effect
What information to record
Report when you suspect a medicine, vaccine or supplement caused an unwanted effect. Certainty is not required, and neither is a health professional’s agreement. Keep the packaging and note the dates.
Where reporting fits into medicine safety
Reports are the raw material of pharmacovigilance. Without them the system has nothing to analyse, which is why the word suspected does so much work: the threshold for reporting is deliberately low, because filtering is the regulator’s job rather than yours. See reporting side effects in South Africa.
Who can report a side effect or adverse drug reaction?
What information to record
Patients, caregivers, doctors, pharmacists, nurses and the companies that market medicines can all report. Patient reports are not a lesser form of evidence: they describe effects on sleep, mood, sexual function and daily life that clinical reports frequently miss.
Where reporting fits into medicine safety
See who can report medicine side effects.
What information should you collect before reporting?
What information to record
- The product. Name, strength, dose form, batch number and expiry date from the carton.
- The person. Age, sex, and relevant history including pregnancy, breastfeeding, kidney or liver conditions and previous reactions.
- The timing. When the product was started, the dose, when the reaction began and how long it lasted.
- The reaction and outcome. What happened, how severe, whether treatment or hospital care was needed, and whether it resolved.
- Everything else taken, including supplements and anything bought without a prescription.
Where reporting fits into medicine safety
The batch number lets a reaction be traced to a specific manufacturing run, separating a quality problem from a property of the medicine itself. The list of everything else being taken is what allows an interaction to be spotted. Those two entries carry disproportionate weight.
How to report through SAHPRA, Med Safety or the ADR form
What information to record
- SAHPRA’s online adverse drug reaction reporting. South Africa’s public reporting is handled through the reporting routes listed on SAHPRA’s health products vigilance page, which SAHPRA links to from its own vigilance pages.
- The Med Safety App. A mobile app for reporting suspected adverse reactions, intended for the public as well as health professionals. See the Med Safety App guide.
- The adverse drug reaction and quality problem reporting form. SAHPRA publishes a single form covering both suspected reactions and problems with the product itself. See the ADR form guide.
- Vaccine reactions follow a separate route through SAHPRA’s AEFI reporting system. See reporting vaccine side effects.
- Through your doctor or pharmacist, who report through the same system and can submit on your behalf.
- Through the company that markets the medicine, which is obliged to collect safety reports and pass them to the regulator.
SAHPRA’s own overview sits on its health products vigilance page. Use one route only, so the same reaction is not recorded twice.
Where reporting fits into medicine safety
South Africa’s reports do not stay in South Africa. National regulators contribute to the World Health Organization’s international monitoring programme, coordinated by the Uppsala Monitoring Centre, so a pattern too small to see in one country can become visible when data from many are combined. See pharmacovigilance in South Africa.
What counts as a serious or unexpected side effect?
Red-flag symptoms
A reaction is treated as serious when it results in death, threatens life, requires or prolongs hospital admission, causes lasting disability, causes a birth defect, or is judged medically important for another reason. That is about consequence, not about how unpleasant it felt.
Unexpected means the reaction is not described in the approved product information. Unexpected reactions matter even when mild, because they may be the first sign of something not yet known.
Deal with the reaction first. If someone has difficulty breathing, facial or throat swelling, chest pain, a seizure, or a blistering rash, get emergency help and report afterwards. See serious medication side effects.
When to contact a doctor, pharmacist, or emergency service
Reporting is not a route to advice or treatment. If you need either, contact a pharmacist or doctor as a separate step.
What happens after a report is submitted?
What information to record
Keep a copy of what you submitted, along with the packaging, in case you are asked for more detail.
Where reporting fits into medicine safety
Reports are assessed together rather than individually, looking for a pattern that stands out from what would be expected anyway. This is the hard part of pharmacovigilance: a person taking a medicine can have a heart attack for reasons entirely unrelated to it, so the question is never whether an event happened, but whether it happened more often than chance would predict.
When a signal is confirmed, outcomes include a change to the patient leaflet, a new warning, a restriction on who should use the medicine, or withdrawal of a product. Most individual reports produce no visible result, which is expected. The value is cumulative.
Medical Disclaimer: This content is for informational and educational purposes only and does not constitute medical diagnosis, prescription, or professional advice. Always read the patient information leaflet and consult a qualified doctor or pharmacist regarding any medicine or health concern.