For health professionalsContact us(08) 6110 0570admin@pdchealthhub.com.au
Medicines

Adverse drug reaction

An adverse drug reaction is an unwanted or harmful effect caused by a medicine, also called a side effect or adverse reaction. Examples include rash, nausea, headache and drowsiness, and reactions range from mild to serious.

Also called
ADR, side effect, adverse reaction
Formerly called

What it means

Not all side effects are serious. Problems can also come from allergies, incorrect doses, or interactions with other medicines, food or alcohol. Ask your pharmacist about possible side effects when you start a new medicine, and take it as directed. If side effects are troubling you, talk to your doctor and pharmacist, who may be able suggest another medicine. Never take a medicine prescribed for someone else.

If you think you might be having a serious side effect, see your doctor at once, and in an emergency call triple zero (000) for an ambulance. You, your doctor or your pharmacist can report a suspected reaction to the Therapeutic Goods Administration (TGA), and you do not need to be certain the medicine caused it. Keep the packaging and note when the problem started.

At PDC Health Hub
PDC Health Hub pharmacists provide medication counselling and medicine reviews, including Home Medicines Reviews and Residential Medication Management Reviews.

Sources and clinical review

Clinically reviewed by
Billy Bryan
Last reviewed:
November 5, 2026
Next review due:
November 1, 2027

Questions about what this means for you?

Our clinicians can explain how this applies to you and help with the next step, whether that is a referral, a device, funding or a plan the rest of the team can see.

Or go straight to a service

Phone (08) 6110 0570 · Medicare, NDIS, DVA and private options across our services