drowsiness

There can be short-term headaches, blurred vision, vomiting, slurred speech, drowsiness or confusion and memory, balance, mood or sleep problems.

Button had taken a large amount of Tramadol - a powerful drug which can cause drowsiness, brain fog and poor vision - to manage his chronic pain on the day of the crash but said that he did not realise he was impaired.

Not only do these medicines come with a risk of side effects like drowsiness, constipation and nausea but longer-term use can lead to physical dependence with a greater risk of overdose.

Exposure to cyanide salts can cause headache, nausea, dizziness, nervousness, confusion, changes in heart rate and drowsiness, according to PHE.

Side effects of cetirizine may include drowsiness, stomachache, fatigue, dry mouth, sore throat, diarrhea and nausea.