PORTLAND, Ore. - A cough suppressant and a drug tested as a schizophrenia therapy curb the involuntary movements that are disabling side effects of taking the Parkinson’s disease medication levodopa, Portland scientists have found.Dextromethorphan, used in such cold and flu medications as Robitussin, Sucrets, Triaminic and Vicks, suppresses dyskinesias in rats, researchers at Oregon Health & Science University and the Portland Veterans Affairs Medical Center found. Dyskinesias are the spastic or repetitive motions that result from taking levodopa, or L-dopa, over long periods.
