Does anyone know what it means when IQ scores drop significantly and the child is relatively stable medication-wise? difficult child 2 took the WISC-IV in July 2005 when still on Paxil (and having strange and aggressive episodes every night). She just took it again as part of applying to private school for next year. Her Verbal score dropped 18 points, her Working Memory dropped 18 points, her Processing Speed dropped 6 points, and her Full Scale dropped 9 points. While her Perceptual Reasoning went up 10 points, there is now a 45-point spread between that score and Working Memory (our educational consultant says this spread, with falling grades this year, could help her qualify for sped). In terms of medications, she is taking Lamictal and Lexapro - neither of which I thought caused cognitive dulling.