I've experienced the same in the past, but not so much in recent years. Soooooo...it isn't necessarily a permanent thing. I am sure that my illness itself (depression and manic sides) contributed to cognitive impairments. Some (not all) medications didn't help either. Clocking a good amount of stable time (letting the brain "heal", as I call it) and working with your psychiatrist to tweak meds or dosages helps. For me, sometimes a medication caused cognitive impairments initially, but they eased over time.