Thirty patients were prescribed 2 or 3 different anti-dementia drugs, mostly in combination with Ginkgo biloba (memantine and Ginkgo biloba n = 10; cholinesterase inhibitors and Ginkgo biloba n = 9; cholinesterase inhibitors and memantine n = 8, cholinesterase inhibitors, memantine and Ginkgo biloba n = 4). The gene discussed is BCHE; the disease is dementia.