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I've been on propecia for about two months now and haven't noticed any side effects for the most part. However, I recently have been feeling sort of out of it and at times feel as if my cognitive function is slowed or delayed. This could easily not be a result of propecia but the countless reports of brain fog after taking propecia make me hesitant to continue usage. Are these claims valid, and can propecia have both short term and long term effects on cognitive function?