A Study Assessing Change in Sense of Smell After Rasagiline Use in Parkinson's Patients

This study will last approximately 10 weeks. * 2 visits to The Parkinson's Institute in Sunnyvale, California * 1 phone call between visits You will be asked to take either Rasagiline (Azilect) or placebo (an identical pill without active ingredients) * 5 in 6 chance of receiving Rasagiline (Azilect) * 1 in 6 chance of receiving placebo * Neither you nor the study team will know which you are assigned * This information will be available in case of emergency To be eligible for this study, you must: * be 90 years old or younger * have a decreased loss of smell or complete loss of smell * have not taken Selegiline or Rasagiline within the past 12 months * have not smoked within the last year * be on a stable dose of Parkinson's medication (or not on any PD medicines) * have no history of head trauma, nasal surgery, nasal inflammation causing congestion or polyps, nasal/sinus infection, or prior Zicam use * have not used decongestants, antihistamine or inhaled steroids within 2 weeks of the study and be willing to avoid such treatments during the study