I am new to this site but need some help with my dad. He is 82 with back pain. He is getting very forgetful and I am wanting to know which of these pain medications is worse for him mentally. His pain is controlled by either of these. He started the Fentenyl 12.5 patch and seems more confused and forgetful then he was on the Norco. Any help would be greatly appreciated because the forgetfulness is making his depression worse.