Patient description: The patient is a 55-year-old man who was recently diagnosed with Parkinson's disease. He is complaining of slowness of movement and tremors. His disease is ranked as mild, Hoehn-Yahr Stage I. His past medical history is significant for hypertension and hypercholesterolemia. He lives with his wife. They have three children. He used to be active with gardening before his diagnosis. He complains of shaking and slow movement. He had difficulty entering through a door, as he was frozen and needed guidance to step in. His handwriting is getting smaller. He is offered Levodopa and Trihexyphenidyl. He is an alert and cooperative man who does not have any signs of dementia. He does not smoke or use any illicit drugs.

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  To Determine the Bioavailability of Tranylcypromine Subjects will be normal, healthy adult men and women who volunteer to participate Is the individual healthy, nonsmoking, normal adult man or woman who volunteers to participate? Is s/he at least 18 years of age? Is his/her BMI between 19 and 30, exclusive? Is she willing to avoid pregnancy by abstaining from sexual intercourse, or by the use of barrier methods. (diaphragm, condom, foams/jellies, sponge), and IUD, or has she has been surgically sterile or post menopausal at least six months prior to entering into the study? Is s/he considered reliable and capable of understanding his/her responsibility and role in the study? Has/s/he provided written informed consent? A no answer to any of the above questions indicates taht the individual is ineligible for enrollment  Does the individual have a history of allergy or hypersensitivity to tranylcypromine? Does/ s/he have clinically significant laboratory abnormalities that would interface with the conduct or interpretation of the study or jeopardize his/her safety? Does s/he have significant history or clinical evidence of auto-immune, cardiovascular, gastrointestinal, hematopoietic, hepatic, neurological, ongoing infection, pancreatic, or renal diseases that would interface with the conduct or interpretation of the study or jeopardize his/her safety? Is she nursing? Does s/he have serious psychological illness? Does s/he have significant history ( within the past year) or clinical evidence of alcohol or drug abuse? Does s/he have a positive urine drug screen or saliva alcohol screen, or a positive HIV-1 , or hepatitis B or C screen, or a positive pregnancy test?-Is s/he unable to refrain from the use of alcohol or xanthine-containing foods or beverages during periods beginning 48 hours prior to study drug administration and ending when the alst blood sample has been taken? Is s/he unable to refrain from the ingestion of smoked meat, cheese (except cream cheese and cottage cheese), wine and beer during periods beginning 48 hours prior to study initiation and ending seven days after the last blood sample has been taken in study period two? Has s/he used any prescription drug during the 14-day period prior to study initiation, or any OTC drug during the 72-hour period preceding study initiation? Is s/he unable to refrain from the use of all concomitant medications during the study?