A lot of people say they lose creativity and stuff on meds, I've never experienced that side effect and I've been on several SSRIs/SNRIs, APs, anti anxiety meds, and mood stabilizers. So I guess it just depends on the person. You may not ever experience that while someone else does. I don't think meds can make someone less intelligent, maybe a sedating med could mess with cognition but that's about it so I wouldn't worry about it