The topic about RItalin as been posted twice on other website and articles such as in this article http://www.newyorker.com/online/blogs/elements/2013/05/a-trip-that-lasts-forever.html it states 'According to some scientists, most psychoactive drugs, including psychiatric medications, can alter the brain’s neural structure'
And
http://amrglobal.powweb.com/hallucinogen-persisting-perception-disorder in the comments section on August 13th, 2009 asking Dr Arbraham whether he thinks Ritalin is the 'Gateway Drug' to HPPD