Endocrine System Home > Synthroid Drug Interactions
Synthroid may affect the levels of theophylline in your blood. Your healthcare provider may need to check your theophylline levels and adjust your theophylline dosage as necessary.
Combining warfarin with Synthroid may increase your risk of bleeding. Your healthcare provider may need to monitor you more closely and adjust your warfarin dose, especially when you start or stop taking Synthroid.