Phase 3 Efficacy and Safety Study in Adults With ADHD Using CTx-1301.

NCT05631626 | Completed Phase 3 FDA Drug

• 1 other identifier: CTx-1301-022
• Study Type: interventional
• Target: 21
• Locations: 1 country
• Sites: 1

Brief Summary

The goal of this clinical trial is to evaluate the efficacy and safety of CTx-1301 in adults with ADHD in a laboratory classroom setting.

Conditions

ADHD; ADHD - Combined Type; Attention Deficit Hyperactivity Disorder Combined; Attention Deficit Hyperactivity Disorder

Outcome Measures

Primary Outcomes (1)

• The primary efficacy analysis will analyze the change in PERMP scores from Baseline (pre-dose) at Visit 8 to hour 16 at Visit 8.

  The Permanent Product Measure of Performance (PERMP) is an objective, validated, skill-adjusted math test that measures attention in ADHD. The PERMP total score comprises the sum number of math problems attempted and the number of math problems answered correctly. A higher PERMP score indicates lower impairment.

  Average of the change of the PERMP scores from baseline (measured pre-dose at Visit 8) to hour 16 at Visit 8.

Secondary Outcomes (2)

• Key secondary analysis will analyze the change in PERMP scores from baseline at each time point during the laboratory environment at Visit 8.

  Baseline (pre-dose) at Visit 8 then post-dose at hours .5,1,3,6,9,12,13,14,15, and 16.

• Key secondary analysis will analyze the change from baseline (pre-dose at Visit 2) of Clinical Global Impression - Severity (CGI-S) scores to CGI-S at Visit 8.

  Baseline (pre-dose at Visit 2) to Visit 8 (approximately 6 weeks).

Other Outcomes (4)

• Safety - incidence of TEAEs

  Screening (Visit 1) to Visit 9 (approximately 7-11 weeks, depending on screening window)

• Safety - incidence of changes in vital signs, BMI, blood labs, physical exams, Columbia-Suicide Severity Rating Scale (CSSR-S), and ECGs.

  Screening (Visit 1) to Visit 9 (approximately 7-11 weeks, depending on screening window)

• Exploratory endpoints will evaluate the efficacy of CTx-1301 during the dose optimization phase.

  Screening (Visit 1) to Visit 7 (approximately 6-10 weeks, depending on screening window).

Study Arms (4)

25mg CTx-1301 (Dexmethylphenidate tablet)

ACTIVE COMPARATOR

All subjects will be titrated to their optimal dose during the dose-optimization phase. The starting dose for all subjects at Day 0 is 25mg. Each subject is expected to be on their optimal dose for 2 sequential weeks prior to the randomization phase. Subjects will be randomized (1:1) to their optimal dose or placebo in the 7-day, double-blind, randomization phase.

Drug: CTx-1301 - Dexmethylphenidate 25mg

37.5mg CTx-1301 (Dexmethylphenidate tablet)

ACTIVE COMPARATOR

All subjects will be titrated to their optimal dose during the dose-optimization phase. Possible doses are 25mg, 37.5mg, or 50mg . Each subject is expected to be on their optimal dose for 2 sequential weeks prior to the randomization phase. Subjects will be randomized (1:1) to their optimal dose or placebo in the 7-day, double-blind, randomization phase.

Drug: CTx-1301 - Dexmethylphenidate 37.5mg

50mg CTx-1301 (Dexmethylphenidate tablet)

ACTIVE COMPARATOR

All subjects will be titrated to their optimal dose during the dose-optimization phase. Possible doses are 25mg, 37.5mg, or 50mg . Each subject is expected to be on their optimal dose for 2 sequential weeks prior to the randomization phase. Subjects will be randomized (1:1) to their optimal dose or placebo in the 7-day, double-blind, randomization phase.

Drug: CTx-1301 - Dexmethylphenidate 50mg

Placebo

PLACEBO COMPARATOR

Subjects will be randomized (1:1) to their optimal dose or placebo in the 7-day, double-blind, randomization phase.

Drug: Placebo

Interventions

CTx-1301 - Dexmethylphenidate 25mg DRUG

25mg CTx-1301 (Dexmethylphenidate tablet)

Also known as: All subjects will be titrated to their optimal dose during the dose-optimization phase. Possible doses are 25mg, 37.5mg, or 50mg of CTx-1301.

25mg CTx-1301 (Dexmethylphenidate tablet)

CTx-1301 - Dexmethylphenidate 37.5mg DRUG

37.5mg CTx-1301 (Dexmethylphenidate tablet)

Also known as: All subjects will be titrated to their optimal dose during the dose-optimization phase. Possible doses are 25mg, 37.5mg, or 50mg of CTx-1301.

37.5mg CTx-1301 (Dexmethylphenidate tablet)

CTx-1301 - Dexmethylphenidate 50mg DRUG

50mg CTx-1301 (Dexmethylphenidate tablet)

Also known as: All subjects will be titrated to their optimal dose during the dose-optimization phase. Possible doses are 25mg, 37.5mg, or 50mg of CTx-1301.

50mg CTx-1301 (Dexmethylphenidate tablet)

Placebo DRUG

Placebo

Also known as: Subjects will be randomized (1:1) to their optimal dose or placebo in the 7-day, double-blind, randomized phase.

Placebo

Eligibility Criteria

• Age: 18 Years - 55 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• Male or female subjects between 18 and 55 years of age (inclusive) at the time of consent.
• Subject must have a body mass index (BMI) ≥18.5 and ≤40.
• Negative serum beta-human chorionic gonadotropin (hCG) pregnancy test for subjects of child-bearing potential and must agree to remain abstinent or agree to use a highly effective, medically acceptable form of birth control for the time of written or verbal consent and for at least 30 days after the last dose of study drug has been taken (females) unless post-menopausal or surgically sterile. Male subjects with female partners must agree at Screening to remain abstinent or agree to use an effective and medically acceptable form of birth control from Screening to 90 days after the last dose of study drug.
• Subject must be in general good health defined as absence of any clinically relevant abnormalities as determined by the Investigator based on physical and neurological examinations, vital signs, ECGs, medical history, and laboratory values (hematology, chemistry, or urinalysis) at Screening. If any of the exams or values are not within the laboratory reference range, the Investigator must review range and determine if clinically relevant. If clinically relevant, the subject is not eligible for the study.
• Subject's intellectual function is at an appropriate level, as deemed by the Investigator.
• Subjects need to be able to perform at least the basic level of problems on the PERMP pre-test with at least 10 questions answered correctly per page or 2 minutes performed at Visit 2.
• Subject must meet Diagnostic and Statistical Manual of Mental Disorders - Fifth Edition (DSM-5) criteria for the primary diagnosis of ADHD for any of the three presentations (combined, inattentive, or hyperactive/impulsive presentation) upon clinical evaluation and confirmed by the Mini International Neuropsychiatric Interview for Attention Deficit/Hyperactivity Disorder - Adults (MINI).
• Subject must score 24 or higher on the Adult ADHD Investigator Rating Scale (AISRS) at the Screening visit (Visit 1) and Baseline visit (Visit 2) if no ADHD medication washout is required. For subjects requiring washout of ADHD medications, this criterion refers to a score following washout at the Baseline visit (Visit 2).
• Subject must have a score of 4 (moderately ill) or higher on the clinician-administrated Clinical Global Impressions-Severity (CGI-S) scale at Screening. For subjects requiring washout of ADHD medications, this criterion refers to a score at the Baseline visit (Visit 2).
• Subject must be able and willing to wash out of all stimulant ADHD medications (except study drug as indicated per protocol), including herbal medication, from 5 days prior to the start of the dose-optimization phase and for the duration of the entire study, defined as completion of the safety follow-up visit. Additionally, subject must be able and willing to wash out from all non-stimulant ADHD medications 21 days prior to the start of the dose optimization phase and for the duration of the entire study, defined as completion of the safety follow-up visit.
• Subject must be able to read, write, speak, and understand English and be able to communicate with the Investigator and study coordinator in a satisfactory fashion and complete any study-related materials. Subject must plan to be available for the entire duration of the study.

You may not qualify if:

• If female and of child-bearing potential, the subject must not be pregnant or breastfeeding at any time during the study or for 30 days following the completion of the study. If of child-bearing potential, urine hCG tests will be administered at protocol specified time points. Any positive pregnancy test during the study will exclude them from further participation in the study.
• Subject has any psychiatric diagnosis of bipolar I or II disorder, current major depressive disorder, conduct disorder, disruptive mood dysregulation disorder, intellectual disability, obsessive-compulsive disorder, eating disorder, anxiety disorder (including generalized anxiety disorder), any history of psychosis, autism spectrum disorder, Tourette's Syndrome, confirmed genetic disorder with cognitive and/or behavioral disturbances, or any other diagnosis/significant medical history that at the discretion of the Investigator excludes the subject from entry into the study.
• Subject has evidence of any chronic disease of the central nervous system (CNS) such as tumors, inflammation, seizure disorder, vascular disorder, potential CNS-related disorders that might occur in childhood, or history of persistent neurological symptoms related to a serious head injury.
• Subject has any clinically significant and/or unstable medical abnormality, chronic medical condition, persistent neurological symptoms, history of cardiovascular abnormality, abnormalities of respiratory, hepatic, gastrointestinal, renal, or any disorder or history of a condition that would impact or interfere with drug absorption, distribution, metabolism, or excretion during the study or may interfere with the participants ability to participate in the study.
• Subject has family history of early cardiovascular disease or sudden death.
• Subject has any history of attempted suicide or clinically significant suicidal ideation based on the Columbia Suicide Severity Rating Scale (C-SSRS) assessment, or answers "yes" to "Suicidal Ideation" item 4 or 5 in the past 3 years on the C-SSRS lifetime/recent assessment at Screening.
• Subject has history of seizures, excluding febrile seizures.
• Subject has a known primary sleep disorder (e.g., sleep apnea, narcolepsy, etc.)
• Subject has a history of moderate to severe hypertension or has a resting sitting systolic blood pressure greater than140 millimeters of mercury (mmHg) or diastolic blood pressure greater than 90 mmHg.
• Subject is considered treatment refractory by the Investigator.
• Any use of anticonvulsants currently or within the past 2 years.
• Uncontrolled thyroid disorder indicated by thyroid stimulating hormone (TSH) ≤0.8 x the lower limit of normal (LLN) or ≥ 1.25 x the upper limit of normal (ULN) from the reference laboratory.
• Subject has first-degree relatives (biological parent or sibling) with a history of schizophrenia, schizoaffective disorder, bipolar I disorder, or bipolar II disorder.
• Subject has history of substance abuse or shows evidence of substance or alcohol use disorder or has a positive urine alcohol or drug screen at Screening. Subjects with positive drug screens may be allowed to continue in the study if the result of the positive drug screen is from prescribed medications and the subject is willing to washout of the medication as required per protocol.
• Subject has a history of physical, emotional, or sexual abuse resulting in a current diagnosis of posttraumatic stress disorder.

Sponsors & Collaborators

• Cingulate Therapeutics: lead
• Rho, Inc.: collaborator

Study Sites (1)

Clinical Research of Southern Nevada, LLC

Las Vegas, Nevada, 89128, United States

Location

MeSH Terms

Conditions

Attention Deficit Disorder with Hyperactivity

Interventions

Double-Blind Method

Condition Hierarchy (Ancestors)

Attention Deficit and Disruptive Behavior Disorders; Neurodevelopmental Disorders; Mental Disorders

Intervention Hierarchy (Ancestors)

Epidemiologic Research Design; Epidemiologic Methods; Investigative Techniques; Research Design; Methods; Health Care Evaluation Mechanisms; Quality of Health Care; Health Care Quality, Access, and Evaluation; Public Health; Environment and Public Health

Study Officials

• Ann Childress, MD

  Principal Investigator

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: phase 3
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: November 14, 2022
• First Posted: November 30, 2022
• Study Start: December 29, 2022
• Primary Completion: June 13, 2023
• Study Completion: June 13, 2023
• Last Updated: August 14, 2025

Record last verified: 2023-06

Locations

US (1)