- Excluded concomitant medications: 1. Acetylcholinesterase inhibitors, Memantine (Alzheimer's disease medications), 2. Insulin or oral hypoglycemics, 3. Anticoagulants (excluding aspirin, clopidogrel, dipyridamole, or other antiplatelet drugs), 4. Neuroleptic drugs, including risperidone, olanzapine, quetiapine, and ziprasidone, 5. Receipt of an investigational drug within the past 30 days (or within 5 half-lives of an investigational drug, whatever is longest)