The most common treatment for hypothyroidism is the daily oral ingestion of the synthetic thyroid hormone levothyroxine, once the correct dose is found. This is a safe and effective treatment, according to the Mayo Clinic.
Determining the correct dosage of levothyroxine may take some time. Doctors generally check thyroid-stimulating hormone levels after two or three months, as explained by the Mayo Clinic. Another consideration is the ability to absorb levothyroxine. Some medications, supplements and even certain foods may affect levothyroxine absorption. These include eating a lot of soy products or a high-fiber diet, as well as certain medications, such as iron supplements, cholestyramine, aluminum hydroxide and calcium supplements.