Edythe, My husband has been taking aricept for about four months now with wonderful improvement in his cognitive functioning. He, however, is unusual in many of his symptoms and his responses to different drugs. It is my understanding that aricept increases acetylcholine in the system and can therefore reduce the available dopamine in the system. Since nasal stuffiness is one of the symptoms of PD, it would seem to me that the aricept might be the culprit for your husband and perhaps especially when he has a meal with protein in it which also seems to cut back on dopamine. We noticed mental improvement within a week of starting aricept, so I would assume if it hasn't helped your husband yet, it won't. As I said, we were the exception to the fact that aricept is contraindicated for PD. Barbara Smith, CG/Ken/69/16