…When the people had allergy symptoms and didn’t take an allergy medicine, their scores on the driving test were much worse than when they didn’t have allergy symptoms. However, their scores improved considerably (although not completely back to normal) if they took an allergy medicine.
During the memory test, driving scores were even worse for people with untreated hay fever. Their scores were similar to people who have been drinking close to the legal alcohol limit in the UK.
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Stay Awake, Drive Safe.