Stanford tests if droperidol changes how patients like fentanyl during surgery

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * American Society of Anesthesiologists (ASA) physical status classification of I, II or III * Candidates who are expected to receive fentanyl up to 3 mcg/kg IBW for their scheduled for surgery or procedure Exclusion Criteria: * Craniofacial abnormalities * Known or suspected difficult intubation or mask ventilation * Known or suspected need for rapid sequence induction and intubation * Allergies or hypersensitivities to droperidol or fentanyl * Clinically significant pulmonary disease, such as chronic obstructive lung disease requiring long-term oxygen therapy, or other conditions that, in the study team's judgment, may increase the risk of severe respiratory depression with opioid administration * History of long QT syndrome * History of Torsades de Pointes * History of psychosis * History of movement disorders e.g. Parkinson's Disease * Past chronic use of anti-psychotics * Current use of droperidol, levodopa, lithium, clozapine, metoclopramide, benzodiazepines * Current use of opioids * History of opiate abuse within the last 3 years * Known or suspected severe chronic pain condition that require use of opiates or limit daily activities * History of pheochromocytoma * History of concomitant prolactin-dependent tumors e.g. prolactinoma, breast cancer * Pregnancy or nursing * Current use of antiemetic medication (i.e., 5HT or dopamine antagonists) * Active seizure disorder * Active mental health disorders resulting in functional impairment * Current use of psychostimulant medications (Adderall) * Current use of CNS depressants (e.g., barbiturates, benzodiazepines) * Severe renal insufficiency (Stage 4 or 5) * Impaired cognitive function * Regular Cannabis use (2+ times per week) * Current history of substance abuse disorder. * Failure to satisfy the investigator of fitness to participate for any other reason