Thyroid Preparations/Ritonavir Interactions
This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Medical warning:
Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Ritonavir may speed up how quickly your body processes your thyroid medicine.
What might happen:
The effects of your thyroid medicine may be changed. You may experience decreased effects (hypothyroidism) such as fatigue, sluggishness, constipation, stiffness, muscle cramps, loss of appetite, excessive weight gain, or dry skin.
What you should do about this interaction:
Let your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Let your doctor know if you have any signs or symptoms of hypothyroidism.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
- 1.Sahajpal R, Ahmed RA, Hughes CA, Foisy MM. Probable interaction between levothyroxine and ritonavir: Case report and literature review. Am J Health Syst Pharm 2017 Apr 15;74(8):587-592.
- 2.Tseng A, Fletcher D. Interaction between ritonavir and levothyroxine. AIDS 1998 Nov 12;12(16):2235-6.
- 3.Touzot M, Beller CL, Touzot F, Louet AL, Piketty C. Dramatic interaction between levothyroxine and lopinavir/ritonavir in a HIV-infected patient. AIDS 2006 May 12;20(8):1210-2.
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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.