Earlier quoted context omitted.
A drug can have real effects while being no better than a placebo for doing something specific (what they're supposed to do).
Okay, so what makes you believe that about prozac (or SSRIs) then?
‘Highlights
• Antidepressant withdrawal can be severe and protracted.
• It produces characteristic physical and emotional symptoms.
• All symptoms were more severe after stopping than before starting antidepressants.
• We identified the 15 most discriminatory withdrawal symptoms in our sample.
• Withdrawal did not differ between people with physical or mental health diagnoses.’