Skip to content

MLS101 Study in PMDD

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

Status
Not yet recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07818720
Enrollment
32
Registered
2026-09-14
Start date
2026-12-01
Completion date
2027-12-01
Last updated
2026-09-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

PMDD, Premenstrual Dysphoric Disorder ( PMDD)

Keywords

PMDD, PMS, Premenstrual Dysphoric Disorder, psilocybin

Brief 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.

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.

Interventions

DRUGMLS101 psilocybin

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

DRUGPlacebo capsules

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

Sponsors

MycoMedica Life Sciences PBC
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
FEMALE
Age
18 Years to 50 Years
Healthy volunteers
No

Inclusion criteria

1. Provides informed consent for participating in the study 2. Biologically female participants 18-50 years of age (inclusive) at Screening and premenopausal 3. Body mass index (BMI) ≥ 18.5 and \< 40.0 kg/m2 4. Menstrual cycle duration of 24-35 days (inclusive) reported at Screening 5. 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 6. Participant has an existing diagnosis of PMDD and history of at least one prior or current medically-supervised treatment for PMDD 7. CGI-S ≥ 4 for late luteal phase PMDD symptom severity and associated impairment at Screening 8. 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 9. 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). 10. 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.

Exclusion criteria

1. 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. 2. History of meeting DSM-5 criteria for Major Depressive Episode within the past 6 months from Screening 3. 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 4. 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) 5. Lifetime history of any psychosis or mania not attributable to substance use 6. First degree relative with schizophrenia, schizoaffective disorder or bipolar I disorder 7. Confirmed to be in perimenopause, or diagnosis of Polycystic Ovary Syndrome based on ACOG/Rotterdam criteria, or diagnosis of symptomatic uterine fibroids 8. PMDD symptoms attributable to, or exacerbated by, hormonal contraceptives/treatments 9. Participant plans to start any new treatment for PMDD, or to stop any ongoing SSRI treatment during the study 10. 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 11. 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.) 12. Use of any non-SSRI antidepressant, antipsychotic, or anticonvulsant within the past 3 months 13. Exposure to a neurosteroid, whether marketed or in a clinical trial, during the past 12 months 14. Requires ongoing pharmacologic treatment for Attention-deficit/hyperactivity disorder (ADHD) 15. 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) 16. Use of a classic (serotonergic) psychedelic in any form and at any dose in the past 6 months 17. 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 18. Estimated glomerular filtration rate (eGFR) below the limit of normal range (\< 60 mL/min/1.73m2) 19. Alanine transaminase (ALT) or aspartate transaminase (AST) \> 1.5 x upper limit of normal (ULN) 20. 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) 21. 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 22. History of or presence of pulmonary hypertension 23. 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: 1. QRS ≥ 120 msec 2. QTcF \> 470 msec 3. PR interval \> 220 msec 24. Known personal or family history of congenital long QT syndrome or sudden death 25. Supine resting bradycardia (pulse \< 45 bpm) or a supine resting tachycardia (pulse \> 100 bpm) at Screening or Day 1 26. 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 27. 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.) 28. 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) 29. 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. 30. Positive results at Screening for human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg) or hepatitis C virus (HCV) 31. Donation or loss of 500 mL or more of plasma or whole blood within 30 days of Screening 32. 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 \-

Design outcomes

Primary

MeasureTime frameDescription
Number of participants with treatment-related adverse events as assessed by CTCAE v6.0From baseline through the final telehealth visit at week 11Safety 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)

Secondary

MeasureTime frameDescription
No change from baseline to end of study in mitral valve leaflet thickness as measured by transthoracic echocardiogramFrom baseline to week 11Baseline 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.
Change in Maximum Plasma Concentreation (Cmax)Day 1 of treatment onlyBlood 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
Change in subjective psychedelic experience from pretreatment to 8 hours after treatmentFrom pretreatment to 8 hours after treatment each treatment dayThe 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.
Participant reported drug likingOnce at the end of treatmentDrug 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.
No change from baseline in Standardized Field Sobriety Test (SFST)From baseline pretreatment to 8 hours after treatmentThe 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.
Mini Mental Status Examination (MMSE) to assess general mental statusFrom pretreatment to 8 hours after treatment.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.
Change in suicidal ideation and behavior as assessed by the Columbia-Suicide Severity Rating Scale (C SSRS)From pretreatment baseline to 8 hours after treatment and at each telehealth and clinic visitsThe 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.
Change in sleep quality from baseline to end of treatmentFrom baseline to day 17The 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.
Change in drug withdrawal symptoms from the day after the last treatment to the final telehealth visitFrom the day after the last study treatment to the final telehealth visitThe 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.

Contacts

CONTACTExecutive Director of Clinical Operations
sbasim@mycomedica.com(732) 690-3185
CONTACTHeather Director of Clinical Operations
hlothamer@mycomedica.com14349963378

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Sep 15, 2026