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Premenstrual Dysphoric Disorder ( PMDD)Phase 1NCT07818720

MLS101 Study in PMDD

A Phase 1 study testing MLS101 psilocybin in people with Premenstrual Dysphoric Disorder ( PMDD) and PMDD, run by MycoMedica Life Sciences PBC.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
Search all trials

Trial summary

The goal of this clinical trial is to learn if MLS101 (psilocybin) is a possible treatment for women with Premenstrual Dysphoric Disorder (PMDD). The main question it aims to answer is: Test the safety and tolerability of the study drug, MLS101 in premenopausal women (ages 18-50 inclusive) with PMDD. Read more about this study

Who is it for?
Ages 18 to 50 years, women only
Conditions the study is for
Premenstrual Dysphoric Disorder ( PMDD), PMDD
What is being tested?
MLS101 psilocybin
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
32 participants
Where
No sites listed yet
Study dates
Dec 2026to Dec 2027
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 50 years
  • Women only
  • No healthy volunteers
  • Adult

Who may be able to join

  • Provides informed consent for participating in the study
  • Biologically female participants 18-50 years of age (inclusive) at Screening and premenopausal
  • Body mass index (BMI) ≥ 18.5 and < 40.0 kg/m2
  • Menstrual cycle duration of 24-35 days (inclusive) reported at Screening
  • Menstrual cycles are sufficiently regular to allow estimation of menses onset with reasonable accuracy based on participant's reported history and the Investigator's assessment
  • Participant has an existing diagnosis of PMDD and history of at least one prior or current medically-supervised treatment for PMDD
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  • CGI-S ≥ 4 for late luteal phase PMDD symptom severity and associated impairment at Screening
  • Mean VAS score ≥ 50 on any one of the 4 core symptoms of PMDD at Screening, as measured using the first 4 items on the PMTS-VAS
  • Participant is using a medically acceptable form of birth control for at least 8 weeks prior to receiving first dose of study drug and agrees to continue using medically acceptable birth control for at least 4 weeks post last dose in the study. Medically acceptable birth control methods include double-barrier methods used with spermicide, copper or low-dose levonorgestrel-releasing IUD, participant has had tubal ligation, participant is in a monogamous relationship with a vasectomized male or with another female, or participant is celibate as part of her lifestyle and will remain so throughout the study. (Note that for this study, oral, subdermal, transdermal, injectable, and vaginal ring hormonal contraceptives are not allowed).
  • If a participant is currently taking SSRI treatment, it must have been maintained as a stable monotherapy for at least 3 months prior to Screening with intent to continue unchanged for the duration of the study.

Who cannot join

  • Currently meets DSM-5 criteria for MDD, GAD, Panic Disorder, OCD, Anorexia, Bulimia, Binge Eating Disorder, Borderline Personality Disorder, or Anti-Social Personality Disorder, based on M.I.N.I.
  • History of meeting DSM-5 criteria for Major Depressive Episode within the past 6 months from Screening
  • History of meeting DSM-5 criteria for Panic Disorder, OCD, Anorexia, Bulimia, Binge Eating Disorder, Anti-Social Personality Disorder, or Borderline Personality Disorder within 24 months from Screening
  • History of meeting DSM-5 criteria for Substance or Alcohol Use Disorder in the last 2 years at Screening (Note: mild recreational cannabis use in the judgment of the Investigator, that does not meet criteria for moderate or severe Substance Use Disorder, is not exclusionary)
  • Lifetime history of any psychosis or mania not attributable to substance use
  • First degree relative with schizophrenia, schizoaffective disorder or bipolar I disorder
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  • Confirmed to be in perimenopause, or diagnosis of Polycystic Ovary Syndrome based on ACOG/Rotterdam criteria, or diagnosis of symptomatic uterine fibroids
  • PMDD symptoms attributable to, or exacerbated by, hormonal contraceptives/treatments
  • Participant plans to start any new treatment for PMDD, or to stop any ongoing SSRI treatment during the study
  • Use of any herbal or supplement with known serotonin-enhancing properties (e.g. St. John's Wort, L-tryptophan, 5-hydroxytryptophan) within the past 3 months at Screening
  • Use of any hormonal contraceptive that works primarily by suppression of ovulation, for the past month at Screening. Therefore, use of oral, subdermal, transdermal, injectable, and vaginal ring hormonal contraceptives is excluded. (However, copper IUDs and hormonal IUDs that release low-dose levonorgestrel are acceptable.)
  • Use of any non-SSRI antidepressant, antipsychotic, or anticonvulsant within the past 3 months
  • Exposure to a neurosteroid, whether marketed or in a clinical trial, during the past 12 months
  • Requires ongoing pharmacologic treatment for Attention-deficit/hyperactivity disorder (ADHD)
  • Suicidal ideation with intent and plan, suicide attempt, or psychiatric hospitalization during the past 12 months, or an answer of "yes" to Question 4 or 5 on the Baseline/Screening version of the Columbia-Suicide Severity Rating Scale (C-SSRS)
  • Use of a classic (serotonergic) psychedelic in any form and at any dose in the past 6 months
  • Participation in another psychiatric clinical trial during the past 6 months, or a clinical trial of any other medical intervention during the past 3 months, at Screening
  • Estimated glomerular filtration rate (eGFR) below the limit of normal range (< 60 mL/min/1.73m2)
  • Alanine transaminase (ALT) or aspartate transaminase (AST) > 1.5 x upper limit of normal (ULN)
  • Total bilirubin > 1.5 x ULN (unless the participant has predominantly unconjugated hyperbilirubinemia in the absence of other liver function test [LFT] abnormalities including elevated Direct [conjugated] Bilirubin)
  • History or presence of clinically significant cardiovascular disease including valvulopathies, cardiac valve abnormalities; or clinically significant heart murmurs, and/or screening echocardiogram, as determined by the Investigator
  • History of or presence of pulmonary hypertension
  • Abnormal and clinically significant ECG measurements at Screening (calculated as the average of 3 individual 12-lead ECG measurements) indicating a second- or third- degree atrioventricular block, or one or more of the following:
  • QRS ≥ 120 msec
  • QTcF > 470 msec
  • PR interval > 220 msec
  • Known personal or family history of congenital long QT syndrome or sudden death
  • Supine resting bradycardia (pulse < 45 bpm) or a supine resting tachycardia (pulse > 100 bpm) at Screening or Day 1
  • History of orthostatic hypotension or postural orthostatic tachycardic syndrome, multiple syncopes, or unresolved/ongoing clinically significant hypotensive episodes or symptoms of fainting, dizziness, or light-headedness
  • History or presence of a neurological or neurodegenerative disorder such Alzheimer's disease or Parkinson's disease, transient ischemic attack, stroke, seizure disorder, or behavioral disturbances resulting from other neurological disorders. (Note: occurrence of childhood febrile seizure is not exclusionary.)
  • Any evidence of current or previous clinically significant disease, e.g., clinically relevant hepatic impairment; clinically relevant renal impairment; diabetes mellitus, thyroid disorder (uncontrolled hypo- or hyperthyroidism), or other endocrine disease; cardiovascular disease (e.g., uncontrolled coronary artery disease, uncontrolled hypertension, uncontrolled hypercholesterolemia); uncontrolled gastrointestinal disease (e.g., active peptic ulcer; uncontrolled hematological disease; uncontrolled autoimmune disorders, or other which may impact or confound the results of the study according to the judgment of the Investigator or Sponsor Medical Monitor (MM)
  • Any medical condition possibly affecting drug absorption (e.g., previous surgery on the gastrointestinal tract [including removal of parts of the stomach, bowel, liver, gall bladder, or pancreas], or history of bariatric surgery). History of cholecystectomy ≥ 1 year prior to Screening would be allowable.
  • Positive results at Screening for human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg) or hepatitis C virus (HCV)
  • Donation or loss of 500 mL or more of plasma or whole blood within 30 days of Screening
  • Participant who, for any reason, is deemed by the Investigator to be inappropriate for this study; or has any chronic or acute medical condition which would confound or interfere with the evaluation of the safety, tolerability, or PK of the investigational product; or is unable to comply with the study protocol
  • -

Trial locations and contacts

No sites are listed yet. Contact the study team or a site near you to ask about taking part.

Executive Director of Clinical Operations contact

(732) 690-3185

sbasim@mycomedica.com

Heather Director of Clinical Operations contact

14349963378

hlothamer@mycomedica.com

About this study

Official title: A Phase 1b Study to Evaluate the Safety and Tolerability of MLS101 Treatment for Premenstrual Dysphoric Disorder (PMDD)

The goal of this clinical trial is to learn if MLS101 (psilocybin) is a possible treatment for women with Premenstrual Dysphoric Disorder (PMDD). The main question it aims to answer is:

  • Test the safety and tolerability of the study drug, MLS101 in premenopausal women (ages 18-50 inclusive) with PMDD.
Read the detailed description

The purpose of this trial is to investigate the safety and tolerability of intermittent low-dose MLS101 (psilocybin) 2mg, 4mg, and 8mg versus placebo in participants with PMDD. These doses are less than one third of the doses typically administered in high-dose psilocybin studies.

The study will enroll premenopausal women, ages 18-50 (inclusive) with an existing diagnosis of PMDD and history of having tried at least 1 prior treatment for PMDD. There is an initial Screening/Preparation Period of up to 2-5 weeks. The 16-day Treatment Period will span the luteal phase of 1 menstrual cycle. During this time, participants will receive 6 doses of MLS101 capsules in the clinic approximately every 3 days. After the Treatment Period, there is a Follow-up Period of approximately 1 month.

Participants will be monitored after receiving each dose for at least 8 hours in the clinic and must meet specified criteria before discharge. All participants will be escorted home by a companion or via concierge care service after each dosing session.

Being tested
MLS101 psilocybin, Placebo capsules
Keywords
PMDD, PMS, Premenstrual Dysphoric Disorder, psilocybin
Medical subject headings
Premenstrual Dysphoric Disorder

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • MLS101 psilocybinDrug

    Patients will be randomized in a 1:1:1:1 ratio to receive 6 doses of either placebo or MLS101 at 2 mg, 4 mg, or 8 mg

  • Placebo capsulesDrug

    Placebo group will receive a total of 6 intermittent doses of placebo

Study groups in NCT07818720
Study groupRoleWhat they receive
Placebo group will receive a total of 6 intermittent doses of placeboPlacebo comparatorNot described
Receives: Drug: Placebo capsules
MLS101 2 mg group will receive a total of 6 intermittent doses at 2 mg/doseActive comparatorNot described
Receives: Drug: MLS101 psilocybin
MLS101 4 mg group will receive a total of 6 intermittent doses at 4 mg/doseActive comparatorNot described
Receives: Drug: MLS101 psilocybin
MLS101 8 mg group will receive a total of 6 intermittent doses at 8 mg/doseActive comparatorNot described
Receives: Drug: MLS101 psilocybin

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of participants with treatment-related adverse events as assessed by CTCAE v6.0

    Safety and tolerability of MLS101 and placebo from baseline through Visit 11/Final Telehealth Visit (Day 44 ± 5) as assessed by type, frequency, severity, timing, and relationship to MLS101 of any adverse events (AEs), adverse events of special interest (AESIs) serious adverse events (SAEs)

    Measured: From baseline through the final telehealth visit at week 11

Secondary outcomes (10)
  1. No change from baseline to end of study in mitral valve leaflet thickness as measured by transthoracic echocardiogram

    Baseline transthoracic echocardiogram to measure mitral valve leaflet thickness. Mitral valve leaflet thickness of < 3 mm is normal, whereas >3 mm in mitral valve leaflet thickness is considered abnormal in an echocardiogram.

    Measured: From baseline to week 11

  2. Change in Maximum Plasma Concentreation (Cmax)

    Blood samples will be collected at 30 minutes, and 1, 2, 3, 4, 6, and 8 hours after a single dose of study drug to determine the change in Cmax

    Measured: Day 1 of treatment only

  3. Change in subjective psychedelic experience from pretreatment to 8 hours after treatment

    The Acute Subjective Effects Scale (ASES) is a visual analog scale from 0-10 with 0 being no psychedelic experience and 10 being the most intense. Participants will have to score less than or equal to 2 to be considered recovered from treatment effects.

    Measured: From pretreatment to 8 hours after treatment each treatment day

  4. Participant reported drug liking

    Drug liking will be assessed using the drug Liking Visual Analog Scale (VAS) which is a scale from 0 which indicates strong dislike to 100 which indicates strong liking and a score of 50 is neutral.

    Measured: Once at the end of treatment

  5. No change from baseline in Standardized Field Sobriety Test (SFST)

    The SFST will be administered before treatment and 8 hours after treatment. There are 3 sections of the test: Horizontal Gaze Nystagmus (HGN) with a score of 0-6; Walk and Turn (WAT) with a score of 0-8 and One Leg Stand (OLS) with a score of 0-4. In each section, a lower score is passing sobriety. To pass the SFST, a score of equal to or less than 4 is required. To pass the WAT and OLS, a score of equal to or less than 2 is required.

    Measured: From baseline pretreatment to 8 hours after treatment

  6. Mini Mental Status Examination (MMSE) to assess general mental status

    The MMSE is a scale with a maximum score of 30, with lower score indicating impairment. Participants will be administered the MMSE before treatment and at 8 hours post treatment. Participants must have a score of equal to or greater than 24 to receive treatment, and a score 24-30 AND no more than -3 points worse than pretreatment after 8 hours to be considered unimpaired.

    Measured: From pretreatment to 8 hours after treatment.

  7. Change in suicidal ideation and behavior as assessed by the Columbia-Suicide Severity Rating Scale (C SSRS)

    The CSSRS will be administered prior to treatment on each dosing day, at 8 hours after treatment, and at all follow-up telehealth and in-clinic visits. Participants with C-SSRS ideation score of 4 or 5, or suicidal behavior will not receive treatment. Participants with an acceptable score for treatment will need a score of less than or equal to 3 and no more than 1 point worse than baseline at 8 hours after treatment.

    Measured: From pretreatment baseline to 8 hours after treatment and at each telehealth and clinic visits

  8. Change in sleep quality from baseline to end of treatment

    The Pittsburgh Sleep Quality Index (PSQI) will be administered at baseline and at end of treatment. This is a subjective assessment of sleep quality. Each component score of the PSQI ranges from 0 to 3, with 3 indicating the greatest dysfunction or disturbance. The seven component scores are then summed to obtain a global PSQI score, which ranges from 0 to 21. Higher scores indicate poorer sleep quality, with a score greater than 5 suggesting significant sleep difficulties.

    Measured: From baseline to day 17

  9. Change in subjective psychedelic experience from pretreatment to 8 hours after treatment

    The 5-Dimensional Altered States of Consciousness (5D-ASC) scale is a 94-item subjective questionnaire to evaluate the subjective psychedelic experience that rates 11 dimensions from 0-100 with higher scores indicating a more intense subjective psychedelic experience.

    Measured: Day 1 of treatment only, prior to treatment to 8 hours after treatment

  10. Change in drug withdrawal symptoms from the day after the last treatment to the final telehealth visit

    The Common Drug Withdrawal Symptom Scale - Psilocybin Version (CDWS-Psil) is a subjective scale the evaluates symptoms of drug withdrawal from psilocybin. The scale is comprised of 32 symptoms that the participant rates as no experience (none) a mild experience, a moderate experience and a severe experience.

    Measured: From the day after the last study treatment to the final telehealth visit

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted14 Sep 2026
  2. Study startDec 2026 (estimated)
  3. Primary completionSep 2027 (estimated)
  4. Study completionDec 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
32 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07818720
Sponsor's protocol ID
MLS101-104
Status last verified
Sep 2026
First submitted
25 Aug 2026
Last updated
14 Sep 2026
Results posted
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing MLS101 psilocybin in people with Premenstrual Dysphoric Disorder ( PMDD) and PMDD, run by MycoMedica Life Sciences PBC.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 10 inclusion and 36 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 14 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Executive Director of Clinical Operations ((732) 690-3185, sbasim@mycomedica.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of participants with treatment-related adverse events as assessed by CTCAE v6.0 (time frame: From baseline through the final telehealth visit at week 11). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 14 Sep 2026; AzTrials last refreshed its copy on 27 Oct 2026.

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