We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Factors Affect Synthroid® Dosage?

Mary McMahon
By
Updated May 17, 2024
Our promise to you
WiseGEEK is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WiseGEEK, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Synthroid® dosage can depend on a patient’s general physical condition as well as the reason for taking the medication. This hormone, known by the generic name of levothyroxine, is a replacement for thyroid hormones used in patients with hypothyroid and other medical conditions that affect the delicate balance of the endocrine system. Patients may need to spend several weeks adjusting their dosing to determine the right amount to take, and require long-term monitoring to confirm that the dosage is still appropriate. An endocrinologist, a hormone specialist, usually oversees treatment although other care providers may be involved as well.

Patients who take this hormone usually want to reach a target range of levels for thyroid-stimulating hormone in their blood. The generally recommended range falls between 0.3 and 3.0 mili-international units (mIU) per liter. Before treatment starts, the care provider can take a blood sample for testing to learn more about the patient’s hormone levels. As the patient takes the Synthroid® dosage, repeat blood tests can monitor levels. Examinations can also evaluate the patient’s response, checking for issues like personality changes, fatigue, or skin breakouts that might be associated with changes in hormone levels.

This medication has a very narrow therapeutic index. Small changes in Synthroid® dosage can result in radical variations in hormone levels. The patient may not have enough thyroid hormones in circulation with a low dose, or could have too much with a higher dose. Some patients also appear to do better when they are slightly outside the normal range, which can only be determined on a case by case basis. For several weeks after starting Synthroid®, the patient may need to report for regular office visits to test hormone levels.

Age, weight, activity level, and genetics can all influence the way the patient processes the medication, and may necessitate small tweaks in the dosage. Furthermore, underlying medical conditions can also be an issue. These may cause levels to rise or fall unexpectedly, or could create medication conflicts that might be a cause for concern. Patients also experience hormone changes during pregnancy, menopause, and major life events that might throw off the correct Synthroid® dosage and require more adjustment.

As a patient takes Synthroid®, the doctor may recommend being cautious about side effects. Patients who notice things like appetite increase or suppression, personality changes, and skin changes may want to talk to their doctors. These could be indicators that the Synthroid® dosage is too high or low. A blood test can quickly determine the patient’s hormone levels and provide guidance for dosing adjustments.

WiseGEEK is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a WiseGEEK researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments

Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Read more
WiseGEEK, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGEEK, in your inbox

Our latest articles, guides, and more, delivered daily.