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Ingredients: Levothyroxine Sodium
Average User Review Score
* Based on 210 reviews from across the web.

Levothyroxine (INN, USAN) or L-thyroxine is a synthetic thyroid hormone that is chemically identical to thyroxine (T4), which is naturally secreted by the follicular cells of the thyroid gland. It is used to treat thyroid hormone deficiency, and occasionally to prevent the recurrence of thyroid cancer. Like its naturally secreted counterpart, levothyroxine is a chiral compound in the L-form. The related drug dextrothyroxine (D-thyroxine) was used in the past as a treatment for hypercholesterolemia (elevated cholesterol levels) but was withdrawn due to cardiac side effects.

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* Extracted from FDA Adverse Event Reports for all drugs with the same active ingredients.

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Druginformer Identified Side Effects: Alopecia

Posted By Anonymous in askapatient.com on February 6, 2015 @ 12:00 am

Side Effects: Persistent hair loss for nine months and not getting better. Going to Dr today for a change. This thyroid med may work for some but not for me.

Druginformer Identified Side Effects: None

Posted By Anonymous in askapatient.com on November 23, 2014 @ 12:00 am

Side Effects: None Does a good job in bring my T3 & T4 in proper range. Very pleased.

Druginformer Identified Side Effects: Headache, Dizziness, Cardiac flutter, Depression, Insomnia, Muscular weakness, Somnolence

Posted By Anonymous in askapatient.com on September 11, 2014 @ 12:00 am

Side Effects: dizziness, fatigue, headache, insomnia, heart palpitations, depression, weakness. I hated it. The day after I switched to Naturethroid, all side effects were gone. I stil...

Druginformer Identified Side Effects: Arthralgia, Fatigue

Posted By Carol in fdb.rxlist.com on June 23, 2014 @ 12:00 am

... excellent, I felt GOOD! About one month after Levothyroxine everything started going to H--- in a handbasket! I am so tired, weight around the middle, hair brittle, and joints hurt. All started with t...

Druginformer Identified Side Effects: None

Posted By Anonymous in askapatient.com on May 22, 2014 @ 12:00 am

Side Effects: No side effects unless dosage is too high or too low. The drug has adequately controlled my thyroid conditio

Druginformer Identified Side Effects: Thyroiditis

Posted By snorkels954 in fdb.rxlist.com on March 30, 2014 @ 12:00 am

on for 3 years and still not regulated after whole thyroid removed 3 years ago

Druginformer Identified Side Effects: None

Posted By laura in fdb.rxlist.com on March 3, 2014 @ 12:00 am

Druginformer Identified Side Effects: Pruritus, Hypersensitivity

Posted By munroe38 in fdb.rxlist.com on January 4, 2014 @ 12:00 am

I was on Levoxyl for years and had a severe reaction to it that the doctor never picked up on. it was Awful being itchy all the time for no reason and nothing would cure the itch that was only located...

Druginformer Identified Side Effects: None

Posted By Anonymous in fdb.rxlist.com on December 29, 2013 @ 12:00 am

Levoxyl was and is the only medicine my body can tolerate and Pfizer once again took it off the shelf!! It's been 9months without Levoxyl for me. My life as many others struggling without has become f...

Druginformer Identified Side Effects: None

Posted By Laura in fdb.rxlist.com on August 30, 2013 @ 12:00 am

I have not started pills.... Looking for information on prescriptions.

* Warning: The facts and figures contained in these reports are accurate to the best of our capability; however, our metrics are only meant to augment your medical knowledge, and should never be used as the sole basis for selecting a new medication. As with any medical decision, be sure to work with your doctor to ensure the best choices are made for your condition.

* About FAERS: The FDA Adverse Event Reporting System (FAERS) is used by FDA for activities such as looking for new safety concerns that might be related to a marketed product, evaluating a manufacturer's compliance to reporting regulations and responding to outside requests for information. Reporting of adverse events is a voluntary process, and not every report is sent to FDA and entered into FAERS. The FAERS database may contain duplicate reports, the report quality is variable, and many factors may influence reporting (e.g., media attention, length of time a drug is marketed, market share). For these reasons, FAERS case reports cannot be used to calculate incidence or estimates of risk for a particular product or compare risks between products.