Psychological, Physiological, Endocrine, and Pharmacokinetic Effects of LSD in a Controlled Study

Inclusion Criteria: 1. Age between 25 and 65 years 2. Understanding of the German language 3. Understanding the procedures and the risks associated with the study 4. Participants must be willing to adhere to the protocol and sign the consent form 5. Participants must be willing to refrain from taking illicit psychoactive substances during the study 6. Participants must be willing to drink only alcohol-free liquids and no xanthine-containing liquids (such as coffee, black or green tea, red bull, chocolate) after midnight of the evening before the study session, as well as during the study day. 7. Participants must be willing not to drive a traffic vehicle within 48 h following LSD administration. 8. Women of childbearing potential must have a negative pregnancy test at the beginning of the study and must agree to use an effective form of birth control. Pregnancy tests are repeated before each study session. Exclusion Criteria: 1. Chronic or acute medical condition including clinically relevant abnormality in physical exam, laboratory values, or ECG. In particular: Hypertension (\>150/95 mmHg). Personal or first-grade history of seizures. Cardiac or neurological disorder. 2. Current or previous psychotic or major affective disorder 3. Psychotic or major affective disorder in first-degree relatives 4. Relevant prior illicit drug use (except tetrahydrocannabinol (THC)-containing products) more than 10 times or any time within the previous 2 months. 5. Pregnant or nursing women. 6. Participation in another clinical trial (currently or within the last 30 days) 7. Use of medications that may interfere with the effects of the study medications (any psychiatric medications) 8. Insufficient interpersonal relationship/rapport with study physician as judged by the study physician