PMS

Premenstrual Dysphoric Disorder (PMDD) is a cyclical mood disorder characterized by emotional, cognitive, physical, and sleep-related symptoms that occur in the days leading up to menstruation and improve shortly after menstruation begins. Although medications are commonly used to treat PMDD, many individuals experience side effects, do not benefit from medication, or prefer non-medication-based approaches. Sleep difficulties are very common in individuals with PMDD and may contribute to mood symptoms, emotional regulation difficulties, and functional impairment. Psychological interventions that focus on sleep, such as sleep psychoeducation and cognitive-behavioural strategies for insomnia, are effective in other mood and anxiety disorders but have not been well studied in PMDD. This study aims to evaluate the feasibility, acceptability, and preliminary effects of a brief, sleep-focused psychoeducation workshop tailored for individuals with PMDD or severe premenstrual symptoms. Information collected in this study may help inform future research and may improve care for individuals with PMDD.

The investigators aim to investigate the role of the serotonin 2A receptor in women with premenstrual disorders. This study uses a double-blind, randomized, controlled design with 3 arms: Intervention 1: 10 micg LSD for \~10 days during the late luteal phase (for 3 cycles) Intervention 2: 10 micg LSD every other day for \~10 days during the late luteal phase (for 3 cycles) Control intervention: Placebo for \~10 days during the late luteal phase (for 3 cycles) Each participant will be treated in only one arm. The study employs a parallel design with three treatment arms and consists of a two-cycle observational phase followed by a three-cycle treatment phase.