Comparative bioavailability of sublingual vs. oral levothyroxine in patients with post-thyroidectomy hypothyroidism: A single-dose pilot study.
Osama Shoaip, Mahmoud Bassiony, Rana Elbayar et al.
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In 30 seconds
This randomized controlled trial assessed the bioavailability of sublingual versus oral levothyroxine in 15 post-thyroidectomy hypothyroid patients. The study found that sublingual administration resulted in a Geometric Mean Ratio (GMR) of 1.283 for total systemic exposure compared to oral administration, although these differences were not statistically significant due to small sample size.
Key findings
- Sublingual levothyroxine showed a GMR of 1.283 for total systemic exposure compared to oral.
- Early exposure (AUC 0-48) for sublingual was 1.123 compared to oral.
- Sublingual delivery demonstrated lower apparent clearance, indicating improved bioavailability.
Why it matters
Understanding the bioavailability of different levothyroxine administration routes can help clinicians optimize treatment for hypothyroid patients, particularly those with absorption issues post-thyroidectomy.
What to keep in mind
The study's small sample size and inter-subject variability limited the statistical significance of the findings.