“…Students who reported regular ED consumption were significantly more likely to experience various complaints including daytime sleepiness, decreased concentration, fatigue, reduced performance, and various physical symptoms; mainly dizziness, muscle twitching, headache, and reduced appetite. Similar studies reported adverse effects such as nervousness 6 , irritability 7 , anxiety 8 , 9 , insomnia 1 , 6 – 11 , tremors 6 , 10 , 12 , fatigue 13 , headaches 6 , 9 , 10 , stomach upset 6 , 10 , abdominal pain 9 , 10 , constipation 9 , palpitations 1 , 6 , 7 , 11 , 12 , 14 , dizziness 9 , flushing 10 , and increased micturition 1 , 10 . Noteworthy, even though most sampled students who reported regular ED consumption mentioned increased energy and mental performance as the main motive to use ED, they reported reduced performance, daytime sleepiness, fatigue, and decreased concentration as perceived adverse effects of ED use.…”