Treatment of hypothyroidism with levothyroxine plus liothyronine: a randomized, double-blind, crossover study
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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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Further trials of liothyronine/levothyroxine combination therapy, as well as the use of thyroid extracts, have recently been published, again with negative results.
“further trials of liothyronine/levothyroxine combination therapy, as well as the use of thyroid extracts, have recently been published, again with negative results. 43,62”
From Use of liothyronine (T3) in hypothyroidism: Joint British Thyroid Association/Society for endocrinology consensus statement (2023) · cites this paper as [62]
Since the publication of the 2014 guidelines, one additional original research study, which did not identify an advantage of combination therapy, has been published.
“Since the publication of the 2014 guidelines, one additional original research study, which did not identify an advantage of combination therapy has been published (19).”
From Short-Term Time Trends in Prescribing Therapy for Hypothyroidism: Results of a Survey of American Thyroid Association Members (2019) · cites this paper as [19]
Of the 14 combination therapy trials that have been completed, 10 employed once-daily LT3 administration, 4 employed twice-daily LT3 therapy, and none used three times a day LT3 therapy.
“Of the 14 combination therapy trials that have been completed, 10 employed once-daily LT3 administration [23, 46, 47, 49, 51, 52, 59, 71, 78, 79], 4 employed twicedaily LT3 therapy [17, 48, 53, 60], and none used three times a day LT3 therapy.”
From Evidence-Based Use of Levothyroxine/Liothyronine Combinations in Treating Hypothyroidism: A Consensus Document (2021) · cites this paper as [79]
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Clinical thyroidology: beyond the 1970s’ TSH-T4 Paradigm
Lindner, H. H. (2025) · Frontiers in Endocrinology · doi:10.3389/fendo.2025.1529791 · Cited by 1 · see citing works
Essentials of Thyroid Hormone Treatment in Differentiated Thyroid Cancer
Aydoğan, B. İ., & Gürsoy, A. (2021) · Nuclear Medicine Seminars · doi:10.4274/nts.galenos.2021.0002
Quarde, A. (2023) · Wiley eBooks · doi:10.1002/9781119863564.ch2
Hypothyroidism Management: Beyond TSH: A Clinical Review
Mazza, A. D., & Dehn, B. (2026) · Clinical Journal for Nurse Practitioners in Women s Health · doi:10.1891/cjnpwh-2025-0063
- 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)
- PMC
- PMC10522160
- 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
- diamond
- doi.org
- 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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