Cited by 42Thyroid Disorders and TreatmentsThyroid and Parathyroid SurgeryHormonal and reproductive studies

Treatment of hypothyroidism with levothyroxine plus liothyronine: a randomized, double-blind, crossover study

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Kaminski, Juliana, Miasaki, Fabíola Yukiko, Paz-Filho, Gilberto, Graf, Hans, Carvalho, Gisah Amaral de·2016·Archives of Endocrinology and Metabolism

Abstract

OBJECTIVE: To compare the effects of a unique fixed combination levothyroxine/liothyronine (LT4/LT3) therapy in patients with primary hypothyroidism. SUBJECTS AND METHODS: This is a randomized, double-blind, crossover study. Adults with primary hypothyroidism (n = 32, age 42.6 ± 13.3, 30 females) on stable doses of LT4 for ≥ 6 months (125 or 150 μg/day) were randomized to continue LT4 treatment (G1) or to start LT4/LT3 therapy (75/15 μg/day; G2). After 8 weeks, participants switched treatments for 8 more weeks. Thyroid function, lipid profile, plasma glucose, body weight, electrocardiogram, vital signs, and quality of life (QoL) were evaluated at weeks 0, 8 and 16. RESULTS: Free T4 levels were significantly lower while on LT4/LT3 (G1: 1.07 ± 0.29 vs. 1.65 ± 0.46; G2: 0.97 ± 0.26 vs. 1.63 ± 0.43 ng/dL; P < 0.001). TSH and T3 levels were not affected by type of therapy. More patients on LT4/LT3 had T3 levels above the upper limit (15% vs. 3%). The combination therapy led to an increase in heart rate, with no significant changes in electrocardiogram or arterial blood pressure. Lipid profile, body weight and QoL remained unchanged. CONCLUSIONS: The combination therapy yielded significantly lower free T4 levels, with no changes in TSH or T3 levels. More patients on LT4/T3 had elevated T3 levels, with no significant alterations in the evaluated outcomes. No clear clinical benefit of the studied formulation could be observed. Future trials need to evaluate different formulations and the impact of the combined therapy in select populations with genetic polymorphisms.

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Authors
Kaminski, J., Miasaki, F. Y., Paz-Filho, G., Graf, H., & Carvalho, G. A. D.
Affiliations
  • Hospital de Clínicas Universidade Federal do Paraná (BR)
  • Australian National University (AU)
Venue
Archives of Endocrinology and Metabolism
Published
2016-12
Volume
60
Issue
6
Pages
562-572
ISSN
2359-3997 (ISSN-L)
OpenAlex
W2515067460
Cited by
42
References
47
Citations by year
2026: 1 · 2025: 5 · 2024: 2 · 2023: 5 · 2022: 4 · 2021: 8 · 2020: 7 · 2019: 4 · 2018: 5 · 2017: 1
FWCI
3.35
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Archives of Endocrinology and Metabolism (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (publishedVersion, other-oa)
  • Americanae (AECID Library) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
Keywords
primary hypothyroidism, levothyroxine, liothyronine, combination thyroid hormone therapy, fixed-dose combination, free thyroxine, thyroid-stimulating hormone, heart rate, lipid profile, body weight, quality of life
MeSH terms
Adult, Blood Glucose, Body Weight, Cholesterol, Double-Blind Method, Drug Combinations, Female, Humans, Hypothyroidism, Male, Middle Aged, Quality of Life, Thyroid Function Tests, Thyrotropin, Thyroxine, Triiodothyronine, Cross-Over Studies

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