Psilocybin-Assisted Therapy for Treatment-Resistant Depression in Bipolar II Disorder (NCT06943573) | Clinical Trial Compass
Not Yet RecruitingPhase 3
Psilocybin-Assisted Therapy for Treatment-Resistant Depression in Bipolar II Disorder
Canada90 participantsStarted 2026-05-01
Plain-language summary
This study is a 12-week (in addition to up to 30 days of screening) randomized, double-blind, placebo-controlled, parallel-group trial. The primary objective of this study is to assess the effectiveness, safety, and tolerability of single-dose psilocybin (25 mg)-assisted therapy in comparison to active placebo (1 mg micro-dose) psilocybin-assisted therapy in patients with bipolar II depression who have not responded to adequate trials with at least two first or second-line treatments for bipolar II depression (i.e. quetiapine, lithium, lamotrigine, sertraline, or venlafaxine as monotherapy or adjunctive therapy, or bupropion adjunctive therapy). The active placebo is a substance that looks identical to the study medication but contains less therapeutic ingredients, and thus is less capable of producing the transformative and meaningful aspects of psychedelic experience compared to the 25 mg dose. Participants will have a total of 11 study visits over a period of up to 16 weeks, which includes 5 therapy sessions from trained study therapists.
Who can participate
Age range19 Years – 65 Years
SexALL
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Inclusion criteria
✓. You are male or female aged 19 to 65 years inclusive.
✓. You have a diagnosis of bipolar disorder type II, and are currently in a major depressive episode.
✓. You are willing, for the entire duration of the study, to practice highly effective methods of contraception (e.g., contraceptive pills, intrauterine device or system, vasectomy and tubal ligation, or double-barrier methods of contraception) OR agree to completely abstain from heterosexual intercourse. Females who do not have childbearing potential are required to be postmenopausal for at least 1 year before the screening visit (confirmed by an FSH test) OR surgically sterile.
✓. You have sufficient English language skills to understand, consent to, and comply with study requirements, study visits, and to return to the clinic for follow-up evaluations.
✓. Your current medications have been at a stable dose for two weeks prior to the dosing visit.
. You have a current unstable or inadequately treated medical illness, especially cardiovascular illness, except for the current depression.
✕. You recently (i.e., within the past 6 weeks) started taking treatment for your acute bipolar depressive episode.
✕. You recently (i.e., within the past 8 weeks) began structured psychotherapy (e.g., cognitive-behavioral therapy, interpersonal psychotherapy, family-focused therapy, or interpersonal and social rhythm therapy).
✕. You have a history of nonresponse or intolerance to psilocybin.
✕. You have, in the past 6 months, used any psychedelic drugs, including ketamine, LSD, or psilocybin-containing mushrooms.
✕. You have a history of non-response to electroconvulsive therapy.