No Change in TSH Level Seen With Switch in Generic LT4 Products
THURSDAY, March 17, 2022 (HealthDay News) -- Switching among generic levothyroxine products made by different manufacturers is not associated with clinically significant changes in serum thyrotropin (TSH) levels, according to a study published online Feb. 28 in JAMA Internal Medicine.
Juan P. Brito, M.D., from the Mayo Clinic in Rochester, Minnesota, and colleagues compared TSH levels among patients who continued taking the same sourced generic levothyroxine product and those who switched to a generic made by a different manufacturer. The analysis included 15,829 adults filling a generic levothyroxine prescription between Jan. 1, 2008, and June 30, 2019.
The researchers found that 82.4 percent of adults continued taking the same sourced preparation, while 17.6 percent switched among generic levothyroxine preparations. Among 2,780 propensity-matched patient pairs, the proportion of patients with a normal TSH level was similar between nonswitchers and switchers (82.7 and 84.5 percent, respectively). Similarly, the proportion of patients with a markedly abnormal TSH level after the index date was similar between the groups (3.1 percent among nonswitchers and 2.5 percent among switchers).
"These findings conflict with the current guideline recommendation that warns clinicians about potential changes in TSH level associated with switching among levothyroxine products sourced from different manufacturers," the authors write.
One author disclosed financial ties to the pharmaceutical and medical devices industries.
Abstract/Full Text (subscription or payment may be required)
Related Posts
Recreational Marijuana Legalization Tied to More Pediatric ED Visits
WEDNESDAY, Jan. 12, 2022 (HealthDay News) -- Legalization of commercial cannabis...
FDA OKs Marketing of New Test to Help Diagnose Alzheimer Disease
FRIDAY, May 6, 2022 (HealthDay News) -- The U.S. Food and Drug Administration...
Las vacunas contra la COVID para los niños menores de 12 años podrían llegar este otoño, según Fauci
MIÉRCOLES, 15 de septiembre de 2021 (HealthDay News) -- El deseo de muchos...
Cardiac Complications Up After SARS-CoV-2 Infection Versus Vaccines
WEDNESDAY, April 6, 2022 (HealthDay News) -- For males and females in all age...