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He later returned to the surgery, saying they were not making him feel better and his doctor moved him from sertraline to citalopram, a similar drug.

Mr Kingston returned to the surgery saying they were not making him feel better, and his doctor moved him from sertraline to citalopram, a similar drug.

A copy of a confidential 1996 memo from firm Pfizer - which originally sold sertraline, now the UK's most common antidepressant - shows employees discussing what the drug company would tell regulators in Norway.

Moreover, at least one antidepressant, sertraline, promoted the transfer of genes between bacterial cells, a process that can speed up the spread of resistance through a population.

Gradually building up his dosage of sertraline, he says the drug "really did help" curb suicidal thoughts he had been having.