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Raloxifene Hydrochloride and Unithroid

Determining the interaction of Raloxifene Hydrochloride and Unithroid and the possibility of their joint administration.

Check result:
Raloxifene Hydrochloride <> Unithroid
Relevance: 15.11.2023 Reviewer: Shkutko P.M., M.D., in

In the database of official manuals used in the service creation an interaction registered by statistical results of studies was found, which can either lead to negative consequences for the patient health or strengthen a mutual positive effect. A doctor should be consulted to address the issue of joint drug administration.

Consumer:

Ask your doctor before using raloxifene. Using these medications together may cause levothyroxine to be less effective. You should consider separating the times of administration as much as possible. You may need a dose adjustment or special test if you take both medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Professional:

MONITOR: An isolated case report suggests that concurrent administration of raloxifene may interfere with the gastrointestinal absorption of levothyroxine. The mechanism of interaction is unknown. A 79-year-old woman stabilized on levothyroxine 0.15 mg/day for several years experienced symptoms of hypothyroidism with an elevated thyroid-stimulating hormone (TSH) level 2 to 3 months after initiating therapy with raloxifene 60 mg/day. The levothyroxine dosage was gradually increased to 0.3 mg/day over the next several months but TSH level remained elevated nine months after starting raloxifene. To test the possibility of an interaction, administration times of the drugs were separated by approximately 12 hours on two separate occasions lasting 6 to 8 weeks each. In addition, the absorption of 1.0 mg of levothyroxine sodium with and without the coadministration of raloxifene was measured on two occasions by collecting serial blood samples for 6 hours. Results of the studies support the speculation that raloxifene reduced the absorption of levothyroxine in the patient.

MANAGEMENT: Pharmacologic response and serum TSH level should be monitored more closely following the addition of raloxifene to a stable levothyroxine regimen. Patients should consider separating the times of administration as much as possible if an interaction is suspected.

References
  • Siraj ES, Gupta MK, Reddy SS "Raloxifene causing malabsorption of levothyroxine." Arch Intern Med 163 (2003): 1367-70
Raloxifene Hydrochloride

Generic Name: raloxifene

Brand name: Evista

Synonyms: Raloxifene

Unithroid

Generic Name: levothyroxine

Brand name: Euthyrox, Levoxyl, Synthroid, Tirosint, Unithroid, Levothroid, Tirosint-Sol

Synonyms: Unithroid (Oral)

In the course of checking the drug compatibility and interactions, data from the following reference sources was used: Drugs.com, Rxlist.com, Webmd.com, Medscape.com.

Interaction with food and lifestyle
Disease interaction