Side effects of switching from synthroid to levothyroxine

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Are you considering changing your thyroid medication? Learn about the potential side effects and advantages of switching from Synthroid to Levothyroxine. Make an informed decision for your health today.

Overview of the medications

When considering thyroid medications like Synthroid and levothyroxine, it’s important to understand their differences and similarities.


Synthroid is a brand-name medication that contains levothyroxine sodium, a synthetic form of the thyroid hormone T4. It is commonly used to treat hypothyroidism, a condition where the thyroid gland does not produce enough hormones.

Side effects of Synthroid may include: hair loss, weight changes, headache, insomnia, and irritability.



Levothyroxine is a generic medication that also contains synthetic T4, making it a common alternative to Synthroid. It works in the same way to regulate thyroid hormone levels in the body.

Switching to levothyroxine: Some patients may experience different side effects when switching from Synthroid to levothyroxine. It’s important to consult with a healthcare provider before making any changes to your medication regimen.

Side effects of Synthroid

Synthroid is a medication commonly used to treat hypothyroidism. However, like any medication, it can cause side effects in some patients. Some common side effects of Synthroid include:

1. Hair Loss

1. Hair Loss

One of the reported side effects of Synthroid is hair loss. Some patients may experience thinning hair or hair loss while taking this medication.

2. Rapid heartbeat

Another potential side effect of Synthroid is a rapid or irregular heartbeat. If you experience palpitations or a fast heartbeat while taking Synthroid, you should consult your healthcare provider.

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Side effect Symptoms
Nausea Feeling sick to your stomach
Headache Pain or discomfort in the head
Tremors Shaking or trembling of the hands

If you experience any severe or persistent side effects while taking Synthroid, you should contact your healthcare provider immediately. It is important to discuss any concerns or symptoms with your doctor to ensure safe and effective treatment.

Switching to levothyroxine

When switching from Synthroid to levothyroxine, it is essential to be aware of the potential differences in dosage and effectiveness. Levothyroxine is a generic form of Synthroid and may have slightly different effects on the body.


1. Consult with your healthcare provider before making the switch.

2. Monitor your symptoms carefully after switching medications.

3. Be prepared for possible adjustments in dosage to achieve optimal thyroid function.

Switching from one thyroid medication to another can be a delicate process, so it’s crucial to communicate openly with your healthcare provider throughout the transition period.

Possible side effects

Switching from Synthroid to levothyroxine may lead to some possible side effects. These can include:

1. Nausea and vomiting
2. Headache
3. Fatigue
4. Weight changes
5. Hair loss

It is important to consult with a healthcare provider if you experience any of these side effects after switching medications.