This page explains what happens if Insulin and Levothyroxine are taken together, according to official sources.
Increased insulin requirement with levothyroxine
Initiating thyroid hormone replacement stimulates glucose production, frequently necessitating an upward adjustment in insulin dose.
Conduct regular blood glucose monitoring upon initiating or adjusting levothyroxine. Titrate insulin accordingly.
Last updated: Sep 25, 2026
Before changing or stopping any medicine, ask your doctor or pharmacist. Never stop your medicine on your own.