My husband was diagnosed with moderate dementia nearly a month ago and was prescribed donepezil 5 mg . After a couple of nights of vivid dreams it was going well until yesterday when he had a very vivid hallucination which he found deeply disturbing.He only had two pills left and has decided not to take any more. He is worried (and so am i) that if this happened again and he was on his own it could have serious consequences depending on the hallucination. He has never had hallucinations before so we are certain that it was the pills. Has anyone else had this happen? We are waiting for the memory clinic nurse to reply to an email to see if they are going to prescribe anything else. I am wondering if perhaps he is better off at the moment being drug free. I know the donepezil is supposed to slow down the progress of dementia but would we ever really know if it had worked?