Drug interactions between simvastatin and Synthroid
Results for the following 2 drugs: |
|
|---|---|
| simvastatin | |
| Synthroid (levothyroxine) | |
Interactions between your selected drugs
levothyroxine ⇔ simvastatin
Applies to: Synthroid (levothyroxine) and simvastatin
Rarely, lovastatin and simvastatin have been reported to reduce the pharmacologic effects of thyroid hormone. The exact mechanism of interaction is unknown. In isolated case reports, patients stabilized on levothyroxine developed symptoms of hypothyroidism and/or elevated thyroid-stimulating hormone (TSH) levels following the addition of lovastatin or simvastatin. Discontinuation of the statin led to resolution of symptoms and normalization of TSH levels. In one case, the patient was subsequently prescribed pravastatin without any adverse effects on his thyroid status. No particular intervention should be necessary when lovastatin or simvastatin is prescribed to patients receiving thyroid hormone therapy, since the interaction appears to be extremely rare. However, thyroid hormone dosage may need to be adjusted if an interaction is suspected. Alternatively, a switch to a statin with a different metabolic profile such as fluvastatin, pravastatin, or rosuvastatin may help.
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