Drug Interaction Report

Using donepezil together with quiNIDine may decrease the benefits of donepezil in the treatment of dementia. Donepezil may also counteract the benefit of quiNIDine. QuiNIDine should generally be avoided in patients with Alzheimer's disease or other cognitive problems. QuiNIDine may also adversely affect elderly patients by producing symptoms ranging from mild thinking impairment to delirium. It is important that you tell your healthcare provider about all other medications that you are using including vitamins and herbs. Do not stop using your medications without first talking to your doctor.

Do not consume grapefruit or grapefruit juice during treatment with quiNIDine unless specifically directed otherwise by your doctor. Grapefruit and grapefruit juice can interact with quiNIDine and increase the levels of quiNIDine in your body. If you are already consuming grapefruit products, do not increase or decrease the amount of these products in your diet without first talking to your doctor.