researchers discovered more than two-thirds -lrb- 69 per cent -rrb- of people taking may not actually have depression , a new study claims .
the u.s. investigators looked at those taking selective serotonin reuptake inhibitors -lrb- ssri -rrb- , the most commonly prescribed type of anti-depressant .
ssris are usually the first choice medication for depression and other psychiatric conditions because they generally have fewer side effects than most other types .