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Topic: subclinical hypothyroidism
Topic: DRUD EFFECTS ON THYROID FUNCTION
Title: Metformin may inhibit thyrotropin (TSH) secretion in
patients with hypothyroidism treated with thyroxine.
Authors: Vigersky RA, Filmore-Nassar A, Glass AR (Washington DC, USA)
Reference: Journal of Clinical Endocrinology and Metabolism: 91: 225-227, 2006
Drug-drug interactions are common but often are discovered only long after initial drug
release. Metformin has been available in the United States for 9 years and elsewhere for many years,
but as of yet there are no reports that the drug modifies thyroid hormone economy. Objective:
The objective of the study was to describe the clinical and biochemical findings of 4
patients with chronic hypothyroidism, previously euthyroid on fixed doses of l-T4 for several years, in
whom the metformin was initiated. Design:
This was a retrospective review.
The study was conducted at a tertiary care military hospital (Walter Reed Army Medical
Center) providing care to active-duty soldiers, sailors and marines, retirees of the armed forces, and
their eligible dependents.
Four patients with chronic hypothyroidism who were placed on metformin participated
in the study.
Intervention, Main Outcome Measurement:
Serum TSH, free T4, and free T3 levels were measured
during metformin treatment.
Initiation of treatment with metformin (three for diabetes mellitus and one for non-alcoholic
steato-hepatitis) caused suppression of TSH to subnormal levels without clinical symptoms of
hyperthyroidism in any patients. There was no change in free T4 or free T3 in patient 1.
No other potential causes of TSH suppression, including medication changes or
interference in the TSH assay, could be identified. The mechanism of the fall in serum TSH in these
four patients is unclear at present time. Should these findings be confirmed in larger prospective
studies, metformin’s ability to suppress TSH without causing clinical or chemical hyperthyroidism
might render this drug a useful adjunct to the treatment of patients with thyroid cancer.
The four patients described in this
daily and it was found (eight months later)
that his serum TSH had decreased from 1.6
females (age range: 58-75 yrs), chronically
to 0.11 mU/L. Patient 2 was given 500 mg
treated with l-T4 after radioiodine ablation
of metformin daily and it was found (two
for Graves’ disease (1), for Hashimoto’s
thyroiditis (1), and after thyroidectomy (2).
decreased from 0.64 to 0.31 mU/L. Patient
Patient 1 was given 1500 mg of metformin
and it was found (interval not given) that
properties, alterations in thyroid hormones
found (three months later) that her serum
TSH had decreased from 1.9 to 0.39 mU/L.
inhibition of TSH secretion (dopamine-like
effect). Despite the limitations, this study
patients, with inherent weaknesses mainly
has the interest of showing that drugs may
because it was retrospective. Serum free T4
administration. Patients were studied at
different time points while taking different
doses of metformin. Overall, the changes
in serum TSH were rather small. If true,
(Daniel Glinoer, MD; PhD
the effects of metformin to reduce serum See Table below
August 22, 2012 To: Sarpy/Cass County Health Care Providers Re: Increased number of S higella Infections in the community From: Sarpy/Cass Department of Health and Wellness Since early August, Sarpy/Cass Department of Health and Wellness has investigated 5 confirmed cases of Shigella sonnei infection, 1of which have been hospitalized. Four of the cases have b
A Nutritional Perspective on Addiction and Depression It is not widely known that depression plays a significant role in the disease of addiction. Frequently depression exists as a co-occurring disorder and must be treated at the same time as the chemical dependency if a successful outcome is to be achieved. This article seeks to explore some of the physiological factors that impact the funct