UW Psilocybin Pharmacokinetics Study

Inclusion Criteria:

* Aged 21 - 80 years
* Able to read, speak, and understand spoken English
* Self-report of at least one prior positive hallucinogen drug experience that included a meaningful altered state of consciousness. Hallucinogenic substances can include psilocybin, LSD, or other classic hallucinogens.
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 based upon CRU NP or study physician physical exam, which indicates a subject is fully functioning.
* A woman of childbearing potential must agree to practice an effective means of birth control during their participation in the clinical trial, up to and including the 90 day follow-up after their last psilocybin dose. Birth control method and written agreement to practice this method throughout the duration of the study will be documented on the Medical History Case Report Form. Effective contraception is defined as the regular use of one of the following:

  * Established use of oral, injected, or implanted hormonal methods of contraception
  * Placement of an intrauterine device (IUD) or intrauterine system (IUS)
  * Barrier methods: Condom or Occlusive cap used with a spermicide
  * female sterilization/hysterectomy (with documentation of surgery)
  * post-menopausal (\>12 months since last menses at the time of screening)
  * Male sterilization (with post-vasectomy documentation)
  * True abstinence
* Ability and willingness to adhere to study requirements, including attending all study visits, preparatory and follow-up sessions, and completing all study evaluations.
* Agree to refrain from using any psychoactive drugs, including alcoholic beverages and tobacco, within 24 hours of each drug administration. The exception is caffeine.
* Participants will be required to be non-smokers.

Exclusion Criteria:

* Estimated creatinine clearance \<30 ml/min, using the Cockcroft Gault equation and actual body weight.
* Clinically significant abnormal chemistry or hematologic laboratory results (from a screen of Complete Blood Count with Differential and Comprehensive Metabolic Panel), using the UWHC core lab reference intervals.
* Females of childbearing potential with positive urine pregnancy at screening or the day of the first treatment.
* Clinically significant abnormalities in physical examination.
* Inadequately treated hypertension (systolic blood pressure \>140 mmHg or diastolic blood pressure \>90 mmHg).
* Personal history of primary psychotic disorder (unless substance-induced or due to a medical condition), bipolar affective disorder Type I or Type II, or schizophrenia.
* First or second-degree family history of primary psychotic disorder, bipolar affective disorder Type I, bipolar affective disorder Type II, or schizophrenia.
* Substance abuse or dependency within the past five years.
* Suicidal ideation or attempt within the past 30 days and/or any prior suicidal ideation/attempt that the study physician and PI feel makes the participant unsuitable for the study.
* Urine drug test containing non-prescribed drugs of abuse (non-prescribed opioids, benzodiazepines, amphetamines, phencyclidine, cocaine) at screening and day of first treatment. Urine cannabinoid concentrations \>50 ng/ml will suggest heavy marijuana use, and will be a threshold for excluding potential subjects.
* Current use of monoamine oxidase inhibitors or dopaminergic antagonists. Any prohibited agents must have been stopped at least 5x the elimination half-life of the specific drug.
* Subject does not have a local support person that is available during their 24 hour treatment and observation period.
* Concurrent or recent (within 5 years) history of major depression, obsessive-compulsive disorder, panic disorder, anorexia nervosa, or bulimia nervosa.
* Poor venous access.
* Known acute coronary syndrome or angina.
* Evidence of ischemic disease or ventricular arrhythmias on screening ECG.
* Cardiac conduction defects on screening ECG.
* Cardiac transplantation as determined by self-report during review of medical history.
* Lactose intolerance (excipient in psilocybin capsules)
* Type I or insulin-dependent Type II diabetes.
* Prescription medicine requiring dosing during the 8 hours of drug action.
* Current or recent (past 5 years) seizure disorder as determined by self-report during medical history and physical exam.
* Chronic or frequent migraines.
* Regular or frequent use of benzodiazepines.
* Attention Deficit Hyperactivity Disorder (ADHD) or Attention Deficit Disorder (ADD).
* Regular or frequent use of stimulants.
* Generalized Anxiety Disorder (GAD).
* Post-Traumatic Stress Disorder (PTSD).
* Neuroleptic medications.
* Any physical or psychological symptom, based on the clinical judgment of the study physician and/or psychologist , that would make a participant unsuitable for the study.
* Any use of a medication(s), based on the clinical judgment of the study physician, that would make a participant unsuitable for the study.
* Any finding(s), based on the screening process, that the PI feels makes the participant unsuitable for the study.