A new THINK! campaign has joined up with high street chemist Boots to warn drivers about the potential effects of over-the-counter and prescription medicines.
Road safety minister Paul Clark has launched the campaign, which will see one million leaflets distributed across more than 2,500 Boots stores.
Also medicine bags will carry stickers advising motorists to check with their doctor or pharmacist that their medicine will not impair their driving ability.
Mr Clarke said the new drive follows an earlier TV, radio and online campaign that tackled those who drove under the influence of illegal drugs.
He added: "It is not just illegal drugs which can affect your driving. Some medicines may cause drowsiness and impair judgement, increasing the risk of an accident.
"That is why we are raising awareness of the potential effects of over-the-counter and prescription medicines on driving ability with this new campaign and I am delighted that Boots UK is helping us to get this message direct to their customers."
Paul Bennett, Boots Professional Standards Director and Superintendent Pharmacist, said: "It is vital that anyone taking medicine follows the instructions properly and continues to take their course. However, people also need to take into account the potential effects their medicine may have on their ability to drive."
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