I don't know if there are any that are stronger. I thought that the doctor usually prescibes the medicines (SSRI or whatever) that are known to work best for specific conditions. Then if one doesn't seem to be working after a good trial period around 4 weeks then something else may be prescribed or the dosage adjusted. It's more of a trial and error sort of thing rather than one is stronger than the other. Of course, some side effects can be so bad that a person can't stay with it 4 weeks. I had hallucinations from Luvox right away and hallucinating is not one of my problems. I think I should have gone off it right away in that case but stuck with it for a couple of months suffering until I came to my senses and thought "why am I staying on this?" I hope I answered your question.

"Things work out best for the people
Who make the best out of the way things work out."
--- Author Unknown ---