Document Detail

Generic levothyroxine compared with synthroid in young children with congenital hypothyroidism.
MedLine Citation:
PMID:  23293325     Owner:  NLM     Status:  MEDLINE    
CONTEXT: Clinicians who prescribe levothyroxine (LT4) for hypothyroidism often feel strongly about using a brand-name drug instead of a generic.
OBJECTIVE: The objective of the study was to determine whether Synthroid resulted in better control of congenital hypothyroidism than generic LT4.
DESIGN: This was a 5-year retrospective study.
SETTING: The study was conducted at 1 tertiary care center.
PATIENTS: Children who were 0-36 months old with congenital hypothyroidism followed up at our center from 2006 to 2011 were treated with either Synthroid exclusively (35 subjects) or generic LT4 exclusively (27 subjects).
INTERVENTIONS: We recorded the subjects' TSH and free T(4) measurements, how often their LT4 dose was adjusted, and the duration of follow-up.
MAIN OUTCOME MEASURE: TSH variance between the groups was measured. Secondary end points were the frequency of LT4 dose changes and the variance in free T(4).
RESULTS: Using the Wilcoxon rank sum test, there was no difference in TSH SD in the Synthroid group compared with the generic group (median 3.0 vs 2.2, P = .27). Using a linear mixed model, children treated with the generic LT4 had lower TSH estimated SD [1.35 with 95% confidence interval (CI) (1.194, 1.526)] than the Synthroid group [1.66 with 95% CI (1.536, 1.803)]. Similarly, no difference was observed in free T(4) SD between the groups using the Wilcoxon rank sum test (median 0.29 generic vs 0.36 Synthroid, P = .11), but the generic group had lower free T(4) estimated SD than the Synthroid group using the linear mixed model [0.216 with 95% CI (0.187, 0.249) vs 0.298 with 95% CI (0.273,0.326)]. Frequency of LT4 dosing adjustments was similar between the groups, both in total (median 2.0 for generic vs 3.0 for Synthroid, P = .097) and when adjusted for number of TSH checks (ratio 0.25 generic vs 0.31 Synthroid, P = .45).
CONCLUSIONS: In our study of congenital hypothyroidism, generic LT4 treatment resulted in similar or better control of hypothyroidism compared with Synthroid, as assessed by the clinical outcomes of TSH variance and the frequency of LT4 dosing adjustments.
Jefferson P Lomenick; Lulu Wang; Steve B Ampah; Benjamin R Saville; Fayrisa I Greenwald
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2013-01-04
Journal Detail:
Title:  The Journal of clinical endocrinology and metabolism     Volume:  98     ISSN:  1945-7197     ISO Abbreviation:  J. Clin. Endocrinol. Metab.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-07     Completed Date:  2013-04-10     Revised Date:  2014-07-31    
Medline Journal Info:
Nlm Unique ID:  0375362     Medline TA:  J Clin Endocrinol Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  653-8     Citation Subset:  AIM; IM    
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MeSH Terms
Child, Preschool
Congenital Hypothyroidism / blood,  drug therapy*
Drugs, Generic / therapeutic use*
Retrospective Studies
Thyrotropin / blood*
Thyroxine / blood*,  therapeutic use*
Treatment Outcome
Reg. No./Substance:
0/Drugs, Generic; 9002-71-5/Thyrotropin; Q51BO43MG4/Thyroxine
Comment In:
J Clin Endocrinol Metab. 2013 Feb;98(2):511-4   [PMID:  23390262 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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