Adjunctive Treatment With L-methylfolate for Treatment-Resistant Generalized Anxiety Disorder: a Pilot Study

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

PHASE4

Total Enrollment

10 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-10-22

Study Completion Date

2026-05-01

Brief Summary

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The goal of this feasibility study is to determine the tolerability and safety of add on treatment with L-methylfolate in patients with treatment-resistant generalized anxiety disorder (GAD). The primary objective is to monitor for side effects and other risks associated with the treatment. Secondary objectives are to compare the severity of symptoms, serum levels of folate, vitamin B12, C-reactive protein, homocysteine, tumor necrosis factor alpha and interleukin 6 before and after treatment. Participants will continue with their usual treatment for GAD and receive add on treatment with L-methylfolate 15 mg per day for 8 weeks. All participants will receive the same intervention.

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Detailed Description

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Background: Up to 33.7% of the population are affected by an anxiety disorder during their lifetime according to large populationbased surveys. Generalized anxiety disorder (GAD) has a lifetime prevalence of 2.8% to 6.2% in these studies. GAD is associated with functional, occupational, and quality of life impairments. Certain types of medications and psychotherapies are established treatments for GAD, but only 50% of the patients respond to the first treatment trial. Deficiency of folates and neuroinflammation are two hypothesis that could explain why some patients with anxiety disorders do not respond to the usual treatments. Supplementation with folates could correct these deficiencies and reduce inflammation, thus increasing the success rates for treatments. In studies with major depressive disorder, adjunctive folates were associated to higher remission rates. Other studies indicate that folate supplementation lowers homocysteine levels and inflammation. Objectives: Ascertain if adjunctive treatment with Lmethylfolate can produce improvement in treatment-resistant GAD subjects. Methods: This is a proof-of-concept pilot study, an open-label trial of adjunctive treatment with L-methylfolate in patients with treatment-resistant GAD. Ten adult patients with treatment-resistant GAD who have been on a stable dose of an SSRI or SNRI for at least 12 weeks will receive 15 mg doses of L-methylfolate daily for 8 weeks. Patients with moderate to severe major depressive disorder or suicide risk will not be included. Serum levels of folate, vitamin B12, C-reactive protein, homocysteine, tumor necrosis factor alpha and interleukin 6will be measured before and after the trial.

Conditions

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Generalized Anxiety Disorder

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

OTHER

Blinding Strategy

NONE

Study Groups

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L-methylfolate arm

Oral administration of L-methylfolate 15 mg per day for 8 weeks.

Group Type EXPERIMENTAL

L-methylfolate

Intervention Type DRUG

Oral administration of L-methylfolate 15 mg per day for 8 weeks. The study drug will be given in addition to the standard of care (SOC) for GAD.

Interventions

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L-methylfolate

Oral administration of L-methylfolate 15 mg per day for 8 weeks. The study drug will be given in addition to the standard of care (SOC) for GAD.

Intervention Type DRUG

Eligibility Criteria

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Inclusion Criteria

* Adults.
* Patients on a stable dose of an selective serotonin uptake inhibitors (SSRI) or serotonin and noradrenaline reuptake inhibitors (SNRI) for at least 8 weeks.
* Treatment-resistant GAD, defined by lack of response to at least two drugs, from two different classes of drugs considered first-line or second-line for GAD according to the Canadian Clinical Practice Guidelines for the Management of Anxiety, Posttraumatic Stress and Obsessive-Compulsive Disorders (Katzman et al., 2014). Only trials lasting at least 8 weeks and with at least the minimum effective dose of the given medication will be considered failed trials.

Exclusion Criteria

* Patients with moderate to severe major depressive disorder based on the Patient Health Questionnaire - Nine Item (PHQ-9) scale (score of 15 or above) at baseline.
* Mini International Neuropsychiatric Interview version (MINI) 7.0 indicates moderate to high current suicidality or "suicide likely in near future" or current suicidal behavior disorder.
* Patients diagnosed with obsessive-compulsive disorder (OCD), bipolar disorder, schizophrenia, schizoaffective disorder, personality disorders, substance use disorders, intellectual disabilities, dementia, epilepsy or other severe neurological diseases.
* Patients with cardiovascular diseases, infections, inflammatory diseases, recent surgeries, recent physical trauma and other medical issues that could produce elevation of c-reactive protein (CRP) or homocysteine.
* Consumption of cannabis, any cannabis by-products, illicit drugs, or alcohol above 3 drinks per week.
* Supplementation of diet with vitamins or consumption of natural health products that may affect anxiety or depression symptoms.
* Reading competence below Grade 5.
* Participants who do not have capacity to conduct consent process.

Minimum Eligible Age

18 Years

Maximum Eligible Age

65 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No