Does prozac make you gain weight by simply taking it, like out of thin air?

Prozac side effect?: An uncommon side effect of Prozac is gradual weight gain. If you have been gaining weight since starting this med with no other explanation for the weight gain, tell prescribing doc and discuss lowering dose or alternative meds. Weight gain as a side effect is reversible when Prozac is stopped. Do eat as healthy as you can and exercise daily. Hope this helps!