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Doctor insights on: Levothyroxine Dose Calculator

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Are levothyroxine dose quantities unreliable ?

Are levothyroxine dose quantities unreliable ?

No: As long as you stay consistent with your medication. That is to say, the brand synthroid may not be bioequivacle to the generic levothyroxine, so it is not recommended to take one one month, than switch to the other, etc. Stick with one specific medication, take is regularly as prescribed approximately the same time each day and get your TSH levels followed as per your doctor and you should be ok. ...Read more

Dr. David Sneid
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Thyroxine (Definition)

Thyroxine is a thyroid ...Read more


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What is considerd a high dose of levothyroxine? I'm at 75mcg and just got moved to 100mcg

What is considerd a high dose of levothyroxine? I'm at 75mcg and just got moved to 100mcg

Moderate : The pill strength of levothyroxine goes from25 mcg to 200mcg. However we do have patients that need more. We don't so much view a dose as high or low rather what your particular body needs to restore normal levels. These levels and doses for some remain constant and for others change at times upward and downward. ...Read more

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I take 50 mg of levothyroxine but my weight creeping up and up even with diet and excercise. Do I need to take more dose to higher my metabolism ?

I take 50 mg of levothyroxine  but my weight creeping up and up even with diet and excercise. Do I need to take more dose to higher my metabolism ?

No: Your dose of thyroid medication should be adjusted based on your lab tests. Your weight may or may not be related to your thyroid level. To loose weight you will need to burn off more calories than you take in. Take a close look at your activity level and total calorie intake. A good start is to keep intake below 1500 calories ...Read more

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How long for a lower dose of levothyroxine to take effect?

How long for a lower dose of levothyroxine to take effect?

Levothyroxine: If your current dose of levothyroxine is causing you to have a high thyroid level and getting symptoms I suggest you stop for a day or two and then re-start with half the original dose.

To be sure you should have your doctor check your thyroid levels every three to six months. ...Read more

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Should your levothyroxine dose also go down when your weight goes down ?

Should your levothyroxine dose also go down when your weight goes down ?

Tests: Not really. You medication dose is based upon you thyroid test results, not your weight. ...Read more

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I accidentally took an extra dose of levothyroxine can you please advise?

I accidentally took an extra dose of levothyroxine can you please advise?

Don't worry: You can skip a day or just continue to take them normally- it really doesn't matter. T4 lasts 4-6 weeks in your body, so there's no danger or problems like overdosage or toxicity. You won't even notice - no symptoms. Just relax and enjoy life with a normal thyroid level. ...Read more

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Can I break LEVOTHYROXINE tablets in half to get only half of the dose??

Can I break LEVOTHYROXINE tablets in half to get only half of the dose??

Pharmacist: I believe you can, but the cutting has to be precisely in half as it's important to get the exact amount of a medication like levothyroxine. Your pharmacist can advise you on most of your questions about your medications and the proper way to take them, however. You could ask him/her if taking the full dose every other day would be effective instead of a half tablet daily. ...Read more

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Taking 500 mcg levothyroxine. When i reduce dose the symptoms return rapidly. Isnt 500 to high?

Taking 500 mcg levothyroxine.  When i reduce dose the symptoms return rapidly. Isnt 500 to high?

Hypothryroid: Treatment is based on laboratory confirmation of the dose of medication the patient is prescribed. Therefore, if your TSH is in the correct range on 500 mcg and your symptoms are controlled then you are on the correct dose. ...Read more

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I take 100 mcg levothyroxine once a day and I think I accidentally took another dose should I be worried will this hurt me please advise?

I take 100 mcg levothyroxine once a day and I think I accidentally took another dose should I be worried will this hurt me please advise?

Don't worry: You'll be fine. Levothyroxine is slow in onset and long lasting. In fact, for occasional people with compliance issues, we will give one week's worth of levothyroxine all at once (eg. 700 mg once per week). It is possible you may feel a "buzz" today (palpitations, tremor) but probably not, unless it is from anxiety over it. You can skip tomorrow's dose. ...Read more

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I was over medicated on Levothyroxine, so I'm on half the dose. I lost 15lbs in weight, its been 5 weeks and I have not gained any weight back.??

I was over medicated on Levothyroxine, so I'm on half the dose. I lost 15lbs in weight, its been 5 weeks and I have not gained any weight back.??

Thyroid and wt loss: Thyroid harmones helps with metabolism. Low functioning thyroid can slow the metabolism Nd decrease weight and high dose of levothyroxine may have increased your thyroid function so you lost weight . It has been 5 weeks since you are on half the dose , get your TSH levels checked so you can be on proper dose needed for you. Are you actually trying to gain weight ? ...Read more

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I have accidently been taking a double dose of levothyroxine for 2 weeks or more. I normally have 100mg but have been taking 200mg. I am worried.

You'll be ok: I would think you would be feeling the double dose: palpitations, nervous, tremor, irritable. I would recommend that you stop entirely for 2 days and then start back on the correct dose. If you are in otherwise good health, the temporary high dose will not have long term effects. ...Read more

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Levothyroxine stops working after 2 months, until dose is increased. Had 4 dose increases over a year. Why does it work for a while then stop?

Thyroid failure: The most common cause of hypothyroidism in an adult is hashimoto's thyroiditis. This is a progressive destruction of the thyroid over months to years. So a dose of thyroid hormone that works now, may not be enough a year from now if the thyroid has less function. Eventually, you will be on a stable dose of thyroid hormone when the output of thyroid hormone from the thyroid ceases. ...Read more

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Accidentally took another dose of levothyroxine 50mcg. Usually take one in morning and different med at night. Took another dose instead. Am i ok?

Yes, OK: Thyroid levels change very slowly over days and weeks. Taking one extra dosage (or missing one dosage once in a while) will not change your level by any significant amount. ...Read more

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I ve been taking levothyroxine for 3 months! last months the dr doubled the dose from 50microgram to100 per day! i still not feeling any better why?

Thyroid problem: Perhaps you have other problems beside the thyroid problem. Have you discussed the breathing problem, hearing loss and wheezing with your doctor? These symptoms may be different than those of low thyroid problems. Get a recheck up with your doctor. ...Read more

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I've been on the same dose of Levothyroxine for 3 years (0.75mcg) & free t4 has always been normal (1.6). Recently, my FT4 was elevated (2.30) Why???

I've been on the same dose of Levothyroxine for 3 years (0.75mcg) & free t4 has always been normal (1.6). Recently, my FT4 was elevated (2.30) Why???

Unsure: If someone has changed the way they take their thyroid medications - if you were taking w/ food and now on empty stomach, if there is a new batch of thyroid meds there can be some variation in potency, less fiber in your diet, lab error, stopping eating soy, herbal supplements, stopping antidepressants or cholesterol meds, taking steroids or being sick --- these can all effect FT4 and TSH levels ...Read more

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My doctor says my levothyroxine dose is too high. Can this cause any of my symptoms?

Yes: Yes, it sure does sound like quite a few of these symptoms can be due to a too high dose of levothyroxine. ...Read more

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I took a benedryl than without thinking took my next days dose of meds. 12 hours since dose 25 mg atenolol, 25 mg hydrodiazide, .125 mg levothyroxine?

I took a benedryl  than without thinking took my next days dose of meds. 12 hours since dose 25 mg atenolol, 25 mg hydrodiazide, .125 mg levothyroxine?

Unwise but: Although it is unwise to take a higher dose of prescribed medications, i presume the peak drug levels in your blood have passed by now. Thus no permanent damage is expected. Be sure to resume taking the next doses of medications on the scheduled day. This means that if you had taken the extra dose 12 hrs after the last dose, you should wait 36 hours before taking the next dose. ...Read more

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Is levothyroxine 50mcg the appropriate dose for someone with tsh levels of 5.25uIU/mL

Is levothyroxine 50mcg the appropriate dose for someone with tsh levels of 5.25uIU/mL

Since the TSH is: on the upper range of normal your levothyroxine dosage is theoretically OK HOWEVER the dosage of thyroid replacement therapy is based not only on blood testing but is a CLINICAL decision best made by your Health Care Provider!!!

Hope this helps!
Dr Z ...Read more

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Can taking a higher dose of levothyroxine affect my period?

It: Could the adjusting of this medication can put a stress on your body and can affect different hormones so your normal cycle may be affected for a little while. Things should go back to normal once the body regulates ...Read more

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How high a dose is 75 mcg of levothyroxine? How often should blood be checked for hypothyroidism?

How high a dose is 75 mcg of levothyroxine?  How often should blood be checked for hypothyroidism?

Modest dose: That is a modest dose for an adult with hypothyroidism. Doses vary from patient to patient, and thus so does the need to check dose. A minimum would be once a year, but when initiating treatment, if weight changes significantly, if adding other medications, etc - all these things could alter your needed dose. Best to confer with your doctor/endocrinologist to find the perfect dose for you. ...Read more

Levothyroxine (Definition)

Of the hormone produced by one's own ...Read more