@Warmduscher - thanks for picking on that one phrase, super, well done.
IF your take the post as a whole you will see that I also -
1 - explained why I thought it was a good idea
2 - agreed that it doesn't suit everyone
3 - said that it was a means to an end, getting the man to a point where he can effectively engage in other therapies
But sure, pick on that.
I think the GP will have made the right decision because having listened to the patient, having had experience of others in the same position, and not having a crystal ball to hand, this is the best immediately available treatment for the problem presented.
You're projecting your own experience in a way that the OP can't possibly find helpful. Just a "well look at my daughter" adds nothing. You said yourself, it was prescribed and then she was dismissed. The problem wasn't the setraline, or the NHS as a concept, it was that the GP saw it as an end in itself which was clearly wrong.
We all know now that women have far worse outcomes/ medical treatment, and who knows what other issues at play. But these are not what the OP needs to know about.
She needs to keep an eye on her son, think about her own language and behaviour around mental health, and trust that this is a positive first step.
As I have already said, if he deteriorates, either dramatically because the drug doesn't suit, or over time, meaning it's not helpful, then SHE should help him get further help and investigation. I actually recommended that!
How did you find that 2 years of decline with your daughter? What I'm recommending would avoid that.
Don't assume the doctor is always right, but don't throw the baby out with the bath water.