•Which OTC medications do you think pose the most significant risk to UAS operators? ◦Why? Some Over the Counter (OTC) drugs despite misconception, can be dangerous to flight safety. For consuming strictly OTC medications, the first that come to mind or those that heed warning not to operate machinery. Antihistamines, anti-allergy, and cold symptom medications that relieve itching, running nose, sneezing etc. can produce significant drowsiness, and effects can last longer than the person realizes. For manned flight, the FAA warns pilots they should ground themselves for at least 5 times the drug’s half-life, such as diphenhydramine (Benadryl) (airspacedoc.com, 2019). Should the rules be the same for UAS operators? Part 107, section 91.17 Alcohol or Drugs states “no person may act or attempt to act as a crewmember of a civil aircraft within 8 hours after the consumption of any alcoholic beverage… while using any drug that affects the person’s faculti...