Levothyroxine is known to interact with many other medications (called a drug-drug interaction), but there are different kinds of drug-drug interactions. Some interactions require that drugs not be taken at the same time, while other interactions require more frequent laboratory testing or monitoring of your disease symptoms.

Taking any other medication or supplement with levothyroxine may cause you to need a higher or lower dose of levothyroxine. Even supplements like calcium or iron can affect absorption of levothyroxine.

Yes, levothyroxine, the main treatment for a sluggish thyroid gland, may cause hair loss in addition to other side effects. You may experience partial hair loss in the first few months of treatment, but this often resolves and goes back to normal in a short time.