Nuzak is a treatment for real Depression, not for work stress ( CBT is a good treatment for both ). If she is not depressed, she should not have been put on the medicine at all ; if she was and is significantly depressed, she should be receiving proper treatment for it, which might be Nuzak. And then she should remain on it until better, which takes months, not days ; and when the doc recommends she stop it, it should be stopped gradually, not suddenly.
Some people do describe, maybe especially in the earl stages of taking such a drug, a relative lack of emoitional expressiveness. But this is not a lasting effect, and is not as unpleasant or damaging as Depression itself.
Maybe if she ( and apparently you ) are unsure of the advice the GP gave, she should ask to see a psychiatrist for a second opinion
An SSRI antidepressant, by the way, doesn't suppress the release of Serotonin, but suppresses the re-uptake of serotonin in the synaptic clefts. As a relative lack of serotonin in those clefts between nerve cells seems to be part of depression, reducing the re-uptake of serotonin leaves what there is available and acting for longer, effecively reversing the relative lack of it.
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