In some countries where regulation of sales of alcoholic drinks is weaker than in Australia, alcoholic drinks can be mixed with harmful substances, particularly methanol, which can cause serious illness, blindness, brain injury or death. Symptoms of methanol poisoning can include fatigue, headaches and nausea, similar to the effects as excessive drinking but with pronounced vision problems that may include blurred vision, flashes of light, tunnel vision, changes in colour perception, dilated pupils, difficulty looking at bright lights, or blindness. Getting urgent medical attention could avoid permanent disability or death. If you suspect that you or a companion may have been poisoned, you need to act quickly.
All suspected cases of methanol poisoning should be reported to local police.