TELEMEDICINE Thyroid Health Practice with a Functional Medicine Approach

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Levothyroxine, also known as L-thyroxine, is a manufactured form of the thyroid hormone thyroxine (T4). It is used to treat thyroid hormone deficiency. It is not indicated for weight loss. Maximum effect from a specific dose can take up to six weeks to occur.

Levothyroxine was first made in 1927. It is on the World Health Organization's List of Essential Medicines, which lists the most effective and safe medicines needed in a health system. Levothyroxine is available as a generic medication. 

Side Effects

Side effects from excessive doses include weight loss, trouble tolerating heat, sweating, anxiety, trouble sleeping, tremor, and fast heart rate.


Use is not recommended in people who have had a recent heart attack.

Use in pregnancy

Use during pregnancy has been found to be safe.

How to find an accurate dose?

It is recommended that dosing be based on regular measurements of thyroid-stimulating hormone (TSH) and T4 levels in the blood. Much of the effect of levothyroxine is following its conversion to triiodothyronine (T3).

Actavis Brand

There are many generic brands of Levothyroxine on the market. We have had good feedback from the Actavis brand and prescribe this brand as our first choice. Should you wish to have a prescription for a different brand, please let us know.

What do they contain?

The active substance (the ingredient that makes the tablets work) is anhydrous levothyroxine sodium.

The other ingredients are lactose, magnesium stearate, maize starch, stearic acid and pregelatinised maize starch.