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Discontinuation of Low-Dose Levothyroxine in Older Adults With Subclinical Hypothyroidism

21 de agosto de 2026 atualizado por: Spyridoula Maraka

Discontinuation of Low Dose Levothyroxine Therapy for Older Adults With Subclinical Hypothyroidism: a Randomized, Double-blinded, Placebo-controlled Study

The goal of this clinical trial is to learn whether low-dose levothyroxine can be safely discontinued in adults aged 65 years or older who are taking levothyroxine for subclinical hypothyroidism. The study will also evaluate the cost-effectiveness of discontinuing levothyroxine.

The main questions it aims to answer are:

  • Does discontinuing levothyroxine result in no clinically meaningful worsening of thyroid-related symptoms compared with continuing levothyroxine?
  • What are the effects of discontinuing levothyroxine on quality of life, tiredness, cognition, thyroid hormone levels, lipid levels, weight, and adverse events?
  • Is discontinuing levothyroxine cost-effective compared with continuing treatment?

Researchers will compare participants who discontinue levothyroxine and receive placebo with participants who continue their current dose of levothyroxine to determine the effects of levothyroxine discontinuation.

Participants will:

  • Complete a 2-week run-in period during which they continue their usual levothyroxine and record their medication use.
  • Eligible participants will be randomly assigned to either continue their current dose of levothyroxine or receive a matching placebo for 6 months. Participants, their clinicians, and study investigators will not know which treatment they are receiving during the study.
  • Complete study assessments at baseline, approximately 2 months, and 6 months. Assessments will include blood tests, measurements such as body weight, questionnaires about thyroid-related symptoms and quality of life, and assessments of cognition and other health outcomes.

Visão geral do estudo

Status

Ainda não está recrutando

Condições

Intervenção / Tratamento

Tipo de estudo

Intervencional

Inscrição (Estimado)

138

Estágio

  • Fase 4

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

Estude backup de contato

Locais de estudo

    • Arkansas
      • Little Rock, Arkansas, Estados Unidos, 72205
        • Central Arkansas Veterans Healthcare System
        • Contato:
        • Contato:
        • Investigador principal:
          • Spyridoula Maraka, M.D., M.S.
    • Florida
      • Gainesville, Florida, Estados Unidos, 32610
        • University of Florida Clinical Research Center
        • Contato:
        • Investigador principal:
          • Naykky Singh Ospina, M.D., M.S.
    • Minnesota
      • Rochester, Minnesota, Estados Unidos, 55905
        • Mayo Clinic
        • Contato:
          • Juan Pablo Brito Campana, M.B.B.S.
          • Número de telefone: (507) 266-0500
          • E-mail: brito.juan@mayo.edu
        • Investigador principal:
          • Juan Pablo Brito Campana, M.B.B.S.

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

  • Adulto mais velho

Aceita Voluntários Saudáveis

Não

Descrição

Inclusion Criteria:

  1. Age ≥65 years.
  2. Euthyroid at the time of enrollment, defined as thyroid-stimulating hormone (TSH) and free thyroxine (fT4) levels within the reference range.
  3. Receiving levothyroxine treatment for subclinical hypothyroidism for at least 6 months.
  4. Receiving levothyroxine at a dose ≤50 mcg/day, or ≤25 mcg/day for participants weighing <50 kg.
  5. Receiving outpatient care at the participating study site for at least 12 months.

Subclinical hypothyroidism is defined as a TSH level above the normal reference range but <10 mIU/L, with a normal fT4 level, prior to initiation of levothyroxine therapy.

Exclusion Criteria:

  1. TSH >10 mIU/L at any time documented in the institutional electronic health record.
  2. Levothyroxine therapy initiated less than 6 months before enrollment.
  3. Abnormal thyroid function at the time of enrollment.
  4. Current use of medications that affect thyroid hormone levels, such as antithyroid medications, amiodarone, or lithium.
  5. History of thyroid cancer or goiter with compressive symptoms.
  6. History of partial or total thyroidectomy or radioactive iodine therapy.
  7. New York Heart Association (NYHA) Class IV heart failure.
  8. Hospitalization for a major illness or elective surgery within the previous 4 weeks, including acute coronary syndrome, acute myocarditis, pancarditis, or stroke.
  9. Unstable medical condition that, in the investigator's judgment, would jeopardize participant safety or interfere with study participation.
  10. Terminal illness with a life expectancy of less than 6 months.
  11. Lack of decision-making capacity.
  12. Severe dyslipidemia, defined as LDL cholesterol >190 mg/dL.
  13. Untreated depression.
  14. Uncontrolled psychiatric disorder.
  15. Uncontrolled chronic fatigue syndrome.
  16. Uncontrolled pain.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Triplo

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Comparador Ativo: Levothyroxine Continuation
Participants will continue their pre-study dose of levothyroxine for 6 months using blinded study medication.
Participants assigned to the levothyroxine continuation arm will continue levothyroxine at their pre-study dose (≤50 mcg/day) for 6 months. Levothyroxine will be administered orally once daily as over-encapsulated study medication matched in appearance to placebo to maintain blinding.
Experimental: Levothyroxine Discontinuation
Participants will discontinue levothyroxine and receive matching placebo for 6 months using blinded study medication.
Participants assigned to the levothyroxine discontinuation arm will discontinue levothyroxine and receive matching placebo orally once daily for 6 months. Placebo will be over-encapsulated and matched in appearance to the active study medication to maintain blinding.

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Mean ThyPRO Hypothyroid Symptoms Scale Score at 6 Months
Prazo: 6 months
Thyroid-related symptoms will be assessed using the 4-item Thyroid-specific Patient Reported Outcome (ThyPRO) Hypothyroid Symptoms Scale. Scores are transformed to a 0-100 scale, with higher scores indicating more severe hypothyroid symptoms. The mean 6-month score will be compared between the levothyroxine discontinuation (placebo) group and the levothyroxine continuation group. The prespecified noninferiority margin is 9 points.
6 months

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Mean ThyPRO Hypothyroid Symptoms Scale Score Over Time
Prazo: Baseline, 2 months, 6 months
Mean score on the 4-item ThyPRO Hypothyroid Symptoms Score. Scores range from 0 to 100, with higher scores indicating more severe hypothyroid symptoms. Longitudinal changes will be evaluated between treatment groups.
Baseline, 2 months, 6 months
Mean ThyPRO Tiredness Scale Score
Prazo: Baseline, 2 month, and 6 months
Tiredness will be assessed using the 7-item ThyPRO Tiredness Scale. Scores range from 0 to 100, with higher scores indicating greater tiredness. Mean scores and longitudinal changes will be compared between treatment groups.
Baseline, 2 month, and 6 months
Mean Brief Fatigue Inventory Score
Prazo: Baseline, 2 months, and 6 months
Fatigue will be assessed during the 9-item Brief Fatigue Inventory (BFI). Items are scored from 0 to 10 and the mean item score will be calculated, with higher scores indicating greater fatigue severity or interference. Mean scores and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean Patient-Generated Index Visual Analogue Scale Score
Prazo: Baseline, 2 months, and 6 months
Participant-identified symptoms considered important and related to subclinical hypothyroidism will be assessed using the Patient-Generated Index (PGI) visual analogue scale. Scores range from 0-100, with higher scores indicating less severe symptoms. Mean scores and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean ThyPRO-39 Quality-of-Life Score
Prazo: Baseline and 6 months
Thyroid-specific quality of life will be assessed using the 39-item ThyPRO-39 questionnaire. Scores range from 0 to 100, with higher scores indicating worse thyroid-related quality of life. Mean scores will be compared between treatment groups.
Baseline and 6 months
Mean EQ-5D Descriptive Index Score
Prazo: Baseline, 2 months, and 6 months
General health-related quality of life will be assessed using the EQ-5D descriptive index. Scores range from -0.59 to 1.00, with higher scores indicating better health-related quality of life. Mean scores and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean EQ Visual Analogue Scale Score
Prazo: Baseline, 2 months, and 6 months
Self-rated health will be assessed using the EQ visual analogue scale (EQ VAS). Scores range from 0 to 100, with higher scores indicating better self-rated health. Mean scores and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Number of Participants Preferring Study Treatment Versus Pre-Study Treatment
Prazo: 2 months and 6 months
Participants will report whether they prefer the treatment they are currently receiving during the study or their pre-study levothyroxine treatment. The number and percentage of participants reporting each preference will be summarized by treatment group.
2 months and 6 months
Mean Modified Telephone Interview for Cognitive Status Score
Prazo: Baseline and 6 months
Cognitive function will be assessed using the Modified Telephone Interview for Cognitive Status (TICS-M), a 13-item cognitive assessment evaluating orientation, concentration, memory, naming, calculation, comprehension, and reasoning. Total scores range from 0 to 39, with higher scores indicating better cognitive performance. Mean scores will be compared between treatment groups.
Baseline and 6 months
Mean Body Weight
Prazo: Baseline, 2 months, and 6 months
Body weight will be measured in kilograms. Mean body weight and change in body weight will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean Thyroid-Stimulating Hormone Level
Prazo: Baseline, 2 months, and 6 months
Serum thyroid-stimulating hormone (TSH) will be measured in mIU/L to assess thyroid function. Mean TSH levels and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean Free Thyroxine Level
Prazo: Baseline, 2 months, and 6 months
Serum free thyroxine (free T4) will be measured in ng/dL to assess thyroid function. Mean free T4 levels and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean Total Cholesterol Level
Prazo: Baseline, 2 months, and 6 months
Serum total cholesterol will be measured in mg/dL. Mean levels and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean Low-Density Lipoprotein Cholesterol Level
Prazo: Baseline, 2 months, and 6 months
Serum low-density lipoprotein (LDL) cholesterol will be measured in mg/dL. Mean levels and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean High-Density Lipoprotein Cholesterol Level
Prazo: Baseline, 2 months, and 6 months
Serum high-density lipoprotein (HDL) cholesterol will be measured in mg/dL. Mean levels and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Mean Triglyceride Level
Prazo: Baseline, 2 months, and 6 months
Serum triglycerides will be measured in mg/dL. Mean levels and longitudinal changes will be compared between treatment groups.
Baseline, 2 months, and 6 months
Incidence of All-Cause Mortality
Prazo: From enrollment to the end of the study at 6 months
Number and proportion of participants who die from any cause during study participation, assessed through medical record review and/or family report.
From enrollment to the end of the study at 6 months
Incidence of Cardiovascular Events
Prazo: From enrollment to the end of the study at 6 months
Number and proportion of participants experiencing one or more cardiovascular events, including acute myocardial infarction, atrial fibrillation, stroke, acute coronary syndrome, or heart failure, assessed through medical record review and participant report.
From enrollment to the end of the study at 6 months
Incidence of Falls and Fractures
Prazo: From enrollment to the end of the study at 6 months
Number and proportion of participants experiencing one or more falls or fractures, assessed through medical record review and participant report.
From enrollment to the end of the study at 6 months
Incidence of Overt Hypothyroidism
Prazo: 2 months and 6 months
Number and proportion of participants who develop overt hypothyroidism based on protocol-defined thyroid hormone criteria.
2 months and 6 months
Incidence of Hyperthyroidism
Prazo: 2 months and 6 months
Number and proportion of participants who develop hyperthyroidism based on protocol-defined thyroid hormone criteria.
2 months and 6 months
Proportion of Participants Maintaining Euthyroid Status After Levothyroxine Discontinuation
Prazo: 2 months and 6 months
Among participants randomized to levothyroxine discontinuation/placebo, the number and proportion who remain euthyroid based on protocol-defined thyroid hormone criteria will be assessed.
2 months and 6 months
Number of Participants with Adverse Events
Prazo: From enrollment to 30 days after Month 6
Number and proportion of participants experiencing one or more adverse events during study participation. Adverse events will be assessed and classified according to the protocol-defined criteria for severity, expectedness, and relationship to study intervention.
From enrollment to 30 days after Month 6
Number of Participants with Serious Adverse Events
Prazo: From enrollment to 30 days after Month 6
Number and proportion of participants experiencing one or more serious adverse events as defined in the study protocol.
From enrollment to 30 days after Month 6

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Investigadores

  • Diretor de estudo: Spyridoula Maraka, M.D., M.S., Central Arkansas Veterans Healthcare System

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Estimado)

1 de outubro de 2027

Conclusão Primária (Estimado)

1 de setembro de 2030

Conclusão do estudo (Estimado)

1 de setembro de 2031

Datas de inscrição no estudo

Enviado pela primeira vez

11 de agosto de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

21 de agosto de 2026

Primeira postagem (Real)

26 de agosto de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

26 de agosto de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

21 de agosto de 2026

Última verificação

1 de agosto de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • LT4-DISCONTINUE-01

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Sim

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

produto fabricado e exportado dos EUA

Não

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