This randomised controlled feasibility trial evaluates the Digital Intervention for Psychedelic Preparation (DIPP), a novel 21-day self-guided program designed to prepare individuals for psychedelic experiences. Forty healthy volunteers will be randomly assigned to either a meditation-based intervention or a music-based control condition. Both groups will follow identical program structures, with the key distinction being their daily practice focus: meditation or music listening. Following the 21-day preparation period, participants will undergo a supervised 25 mg psilocybin session at University College London. Assessment visits include an in-person follow-up at 2 weeks post-session, followed by online assessments at 3, 6, and 9 months. The primary outcomes include operational feasibility (recruitment rates and participant retention) and intervention adherence (completion rates of DIPP program activities). Secondary outcomes include participant ratings of the platform's feasibility, acceptability, and usability, as well as changes in psychedelic preparedness, the quality of the psychedelic experience, and mental wellbeing over time.

Growing evidence demonstrates the therapeutic potential of psychedelic substances, particularly psilocybin, in addressing mental health challenges and enhancing psychological well-being. While psychedelic experiences can catalyse profound positive changes, they can also be psychologically challenging and potentially destabilising, underscoring the need for thorough preparation. Studies consistently show that an individual's psychological state prior to psychedelic administration significantly influences both the acute experience and its lasting benefits. However, structured preparation protocols designed to optimise this pre-psychedelic state remain understudied despite their crucial role in therapeutic outcomes.

Digital health interventions offer a promising solution for delivering standardised preparation protocols at scale. Meditation-based approaches warrant particular investigation, as they systematically cultivate both immediate psychological states and enduring traits (e.g. non-judgemental acceptance) beneficial for psychedelic experiences. Through regular practice, meditation promotes trait-like metacognitive awareness, emotional regulation, and tolerance of uncertainty - qualities particularly valuable for navigating altered states of consciousness. These benefits are supported by neuroscientific evidence showing that meditation and psychedelics influence similar brain networks and mechanisms. While traditional meditation training often requires substantial time investment and in-person instruction, digital platforms can provide efficient structured guidance without the need for face-to-face support from a trained instructor, while maintaining essential elements of practice. This combination of accessibility and evidence-based benefits makes digital meditation platforms particularly well-suited for preparing individuals for psychedelic experiences.

This randomised controlled feasibility trial evaluates the Digital Intervention for Psychedelic Preparation (DIPP), a 21-day self-guided program. Forty healthy volunteers will be randomised 1:1 to either a meditation-based intervention or music-based control condition. Both groups will engage with identical program structures, differing only in their daily practice (meditation versus music listening). Following preparation, all participants will undergo a supervised 25 mg psilocybin session at University College London, with follow-up assessments conducted in person at 2 weeks and online at 3, 6, and 9 months post-intervention.

The primary outcomes address two key aspects of feasibility: operational feasibility and intervention adherence. Operational feasibility evaluates study-wide metrics, including recruitment efficiency (target ≥1 participant per week) and participant retention (target ≥70% completion through the 2-week post-dose follow-up). Intervention adherence focuses on participant engagement with the DIPP activities (meditation or music listening), assessed through completion rates for daily sessions, mood check-ins, journal entries, and weekly tasks, with a target of ≥70% of participants achieving an average completion rate of 70% or higher. Secondary outcomes, reported descriptively for both conditions, include implementation measures such as subjective feasibility (SFIS), acceptability (TFA), and usability (SUS/MARS) ratings. Efficacy measures assess changes in psychedelic preparedness (PPS) from baseline to post-DIPP intervention, the qualities of the acute psychedelic experience (11-Dimensional Altered States of Consciousness Scale [11D-ASC] and Challenging Experience Questionnaire [CEQ]) following dosing, and changes in mental wellbeing (Warwick-Edinburgh Mental Wellbeing Scale [WEMWBS]) from baseline through the 2-week post-dose follow-up.

As such, this study will investigate the feasibility of implementing a digital preparation protocol within a research setting, while gathering preliminary data on engagement, acceptability, and potential efficacy. The findings will inform refinements to the DIPP platform and protocol, supporting the development of accessible, standardised preparation methods for psychedelic research and therapy as the field continues to expand into diverse clinical and community-based settings.

Inclusion Criteria:

Aged 21-65 years. Limited psychedelic use (0-5 sessions involving a high/full dose, defined as producing noticeable psychoactive effects beyond microdosing; none in the past 6 months).

Minimal meditation experience (≤10 sessions exceeding 30 minutes; no retreats or regular practice).

Native English speaking. Normal or corrected-to-normal colour vision. Able and willing to provide informed consent. Able to engage with all study requirements, including in-person and remote sessions.

UK resident registered with a primary care practice. Agree to allow research team contact with primary/secondary care teams if needed.

Access to mobile smartphone.

Exclusion Criteria:

Current or past psychiatric diagnosis (e.g., depression, anxiety) unless in clear remission for at least 5 years and assessed as low-risk.

Current or past psychotic or bipolar disorder diagnosis. First degree relative with psychotic or bipolar disorder diagnosis. Current or past behaviours, including attempts, planning or intention. Medically significant physical health conditions (e.g., cardiovascular disease, uncontrolled hypertension, epilepsy, migraines, focal scalp sensitivity, or any condition posing a safety risk).

Use of medications interacting with psilocybin (e.g., antipsychotics, SSRIs, SNRIs, TCAs, mood stabilisers).

Psychoactive drug use within 30 days (except nicotine or caffeine). Pregnancy, planning pregnancy, or breastfeeding. Participation in a drug trial within 6 months. MRI contraindications (e.g., metal implants, pacemakers, severe claustrophobia).

De-identified individual participant data (IPD) underlying published results will be shared. This includes questionnaire responses, behavioural task data, hormonal measures, EEG and ECG recordings. Access to these data will be granted upon reasonable request to the corresponding author, subject to a data-sharing agreement ensuring participant confidentiality and compliance with data protection regulations. De-identified fMRI data will be made publicly available in suitable repositories, where permitted by institutional policies and applicable regulations. Requests will be evaluated based on the scientific merit of proposed analyses.

IPD and supporting information will be available beginning 6 months after publication of the primary results and will remain available for 5 years. De-identified fMRI data will be deposited in a public repository as soon as institutional approvals permit. Other de-identified data (questionnaire, behavioural, hormonal, EEG, and ECG) and analytic code will be shared upon reasonable request to the corresponding author within this period, subject to a data-sharing agreement.

Qualified researchers affiliated with academic or healthcare institutions may request access to de-identified IPD and supporting information for scientifically sound, ethically approved analyses that align with the study's objectives. Requests must include a detailed research proposal, analysis plan, and evidence of ethical approval or exemption. Proposals will be reviewed by the study's data access committee to assess scientific merit, feasibility, and compliance with participant confidentiality. Approved users must sign a data-sharing agreement. Requests should be submitted via email to the corresponding author.