Drug Interactions With Thyroid USP

By Kristi Monson, PharmD; Arthur Schoenstadt, MD |

Several medications may potentially cause drug interactions with thyroid USP, including cholestyramine, calcium supplements, and estrogens. Some of these medications may bind to thyroid USP in the digestive tract and prevent it from being absorbed into the body, while others can increase your risk for side effects. Other medications that may cause drug interactions with thyroid USP include theophylline, antacids, and warfarin.

An Overview of Drug Interactions With Thyroid USP

Thyroid USP may interact with numerous other medications, including over-the-counter medications. Some of the medicines that may potentially lead to drug interactions with thyroid USP include:

Antacids
Calcium supplements
Certain seizure medications, such as:

Carbamazepine (Carbatrol^®, Epitol^®, Equetro^®, Tegretol^®)
Phenytoin (Dilantin^®, Phenytek^®)

Cholestyramine (Prevalite^®, Questran^®, Questran^® Light)
Colestipol (Colestid^®)
Diabetes medications
Estrogens, such as birth control pills, patches, rings, or hormone replacement therapy (HRT)
Theophylline (Uniphyl^®, Theocron^®, TheoCap^®, Theo-24^®, Elixophyllin^®)
Warfarin (Coumadin^®, Jantoven^®).

More Information on Thyroid USP Interactions

The following sections explain in detail the potentially negative interactions that can occur when thyroid USP is combined with any of the drugs listed above.