A Phase 1 Study To Evaluate The Effect Of Dimebon On The Pharmacokinetics Of Dextromethorphan

Inclusion Criteria: * Healthy adult subjects. * Extensive or ultra-rapid metabolizers of CYP2D6 substrates, predicted by genotype. Exclusion Criteria: * Existence of significant medical conditions that would impact study results or pose unacceptable risks to study subjects. * Pregnant or nursing females or females of childbearing potential who are unwilling or unable to use an acceptable method of contraception. * Use of prescription or nonprescription drugs and dietary supplements within 7 days prior to the first dose of study medication.