If your parent is identified as having Alzheimer’s, there are a few options your doctor may propose: Cholinesterase inhibitors and Memantine. Determining the effectiveness of these treatments calls for patience, as both take 4 – 6 weeks before benefits may be realized. And, it is imperative to weigh the benefits versus any adverse side effects, which may involve confusion and constipation in memantine, and nausea, vomiting and a reduced heart rate with cholinesterase inhibitors.