Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
140 Doctors are Online

What is the appropriate dosage of levothroxine?

User rating for this question
Very Good
Answered by

Practicing since : 2001
Answered : 1663 Questions
how much of levothroxine can i take bofore it becomes of dosage to high? i'm a 54 year old womam now taking 75mcg. I've been on this amount all adult life. but now as I go through rmenapause the weight just keeps adding on. i have nerver had any of weight gain issue, in fact the opposite. Eventhough I'm watching (closely what I eat. I also workout.
Posted Sun, 2 Feb 2014 in Thyroid Problem and Hormonal Problems
Answered by Dr. Shehzad Topiwala 1 hour later
Brief Answer: Thyroid Detailed Answer: The best way to tell if you are getting too much of thyroid dose is to go by the TSH in your lab test. If the value falls consistently below 0.4, especially along with free T4 higher than upper limit of normal, it is a clear indication that the dose is excessive for your body. This approach is applicable to the most common form of hypothyroidism in the world ie Primary hypothyroidism as opposed to the rare secondary hypothyroidism in which the pituitary does not function adequately. Also if you are on steroids or opioid pain killers then that can lower the TSH and in these instances it is a bit trickier to go by the TSH values. In general, most women need around a 100 mcg but again the best way is to go by the TSH in the situations described above. Weight based calculations have been proposed and endocrinologists sometime use 1.6 mcg per kg body weight as a rough guide to estimate an individuals requirements. Keep in mind this is kilogram based, not in pounds. So for example a 100 kg person = 220 pounds, will likely require 160 mcg daily as a possible replacement dose. However, it is a useful guide and most endocrinologists follow the lab values as well the person's well being
Above answer was peer-reviewed by
Share on Facebook
Share on Twitter
Share on Google+
Question is related to
Diseases and Conditions
Medical Topics

The user accepted the expert's answer

Ask an Endocrinologist

© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor