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Cytomel and Provida DHA

Determining the interaction of Cytomel and Provida DHA and the possibility of their joint administration.

Check result:

Cytomel <> Provida DHA

Relevance: 04.11.2023 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:

Using multivitamin, prenatal together with liothyronine may decrease the effects of liothyronine. You should separate the administration of liothyronine and multivitamin, prenatal by at least 4 hours. If your doctor does prescribe these medications together, you may need a dose adjustment or special test to safely use 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:

ADJUST DOSING INTERVAL: Concurrent administration of calcium-containing products may decrease the oral bioavailability of levothyroxine by one-third in some patients. Pharmacologic effects of levothyroxine may be reduced. The exact mechanism of interaction is unknown but may involve nonspecific adsorption of levothyroxine to calcium at acidic pH levels, resulting in an insoluble complex that is poorly absorbed from the gastrointestinal tract. In one study, 20 patients with hypothyroidism who were taking a stable long-term regimen of levothyroxine demonstrated modest but significant decreases in mean free and total thyroxine (T4) levels as well as a corresponding increase in mean thyrotropin (thyroid-stimulating hormone, or TSH) level following the addition of calcium carbonate (1200 mg/day of elemental calcium) for 3 months. Four patients had serum TSH levels that were higher than the normal range. Both T4 and TSH levels returned to near-baseline 2 months after discontinuation of calcium, which further supported the likelihood of an interaction. In addition, there have been case reports suggesting decreased efficacy of levothyroxine during calcium coadministration. It is not known whether this interaction occurs with other thyroid hormone preparations.

MANAGEMENT: Some experts recommend separating the times of administration of levothyroxine and calcium-containing preparations by at least 4 hours. Monitoring of serum TSH levels is recommended. Patients with gastrointestinal or malabsorption disorders may be at a greater risk of developing clinical or subclinical hypothyroidism due to this interaction.

References

Singh N, Singh PN, Hershman JM "Effect of calcium carbonate on the absorption of levothyroxine." JAMA 283 (2000): 2822-5
Neafsey PJ "Levothyroxine and calcium interaction: timing is everything." Home Healthc Nurse 22 (2004): 338-9
Csako G, McGriff NJ, Rotman-Pikielny P, Sarlis NJ, Pucino F "Exaggerated levothyroxine malabsorption due to calcium carbonate supplementation in gastrointestinal disorders." Ann Pharmacother 35 (2001): 1578-83
Schneyer CR "Calcium carbonate and reduction of levothyroxine efficacy." JAMA 279 (1998): 750

Cytomel

Generic Name: liothyronine

Brand name: Cytomel, Triostat

Synonyms: n.a.

What is Cytomel?

Provida DHA

Generic Name: multivitamin, prenatal

Brand name: A-Free Prenatal, Azesco, CitraNatal 90 DHA, CitraNatal Assure, CitraNatal B-Calm, Materna, Pramilet FA, Stuartnatal Plus, Natalins Rx, Norlac RX, Neo-Forte, Mynatal, Zenate Advanced Formula, Prenatal MR 90, O-Cal-FA, Equi-Natal Plus, Pan OB Forte, Hi-Nate 90, Lactocal-F, Maternity-90, Prenazyme 1+1, Pre-H-Cal, Femnatal, Vynatal 1 Plus 1, Par-F, Maternity, Niferex PN Forte, Prenavite, Mynatal PN, Obnate 90, Maternal 90, Mynatal Rx, PreCare, Natarex, Ternamar, Aminatal Plus, Elemental Iron-90, Mynatal PN Forte, Mynatal FC, Mynate 90 Plus, Vitamed Prenatal Formula, Zitamin, Preterna, Vernate, Vernate Advanced, Prenate 90, Aminate, Mission Prenatal Rx, Niferex-PN, Marnatal-F, Prenate Ultra, Prenatal Z Advanced Formula, Prenatal Plus, Zenate Prenatal, NatalCare, Prenatal Plus with Beta-Carotene, Prenatal Rx, Maternity plus Beta Carotene, Equi-Natal M, Equi-Natal Rx, Equinatal 90, Equi-Natal Z, Natalcare Pic Forte, Natalcare Pic, Natalins, Stuart Prenatal with Beta Carotene, Prenatal MR 90 Fe, Aminatal Plus One, Aminate with 90 mg Iron, Ultra NatalCare, Prenatal S, Natafort, Nestabs, Nestabs CBF, Vitafol PN, Fem-Natal, Ami-Natal Plus One Improved, Aminatal Plus New Formula, Prenatal Plus with 27 mg Iron, Obegyn, Mission Prenatal, Mission Prenatal FA, Mission Prenatal HP, Mynatal Z, Mynatal Plus, Mynatal Ultracap, Prenatal Plus Iron, Prenatal 1 Plus 1, Natalcare Plus, Prenatal MTR with Selenium, Natalcare Rx, Prenavite FC, Prenavite PC, Chromagen OB, Natatab CFe, Natatab FA, Vitelle Nestabs OTC, NataChew, Premesis Rx, Prenate Advanced Formula, Precare Conceive, Citracal Prenatal Rx, Advanced NatalCare, NutriNate, Nestabs Rx, Stuartnatal Plus 3, Strongstart, Anemagen OB, Ultra-Natal, NatalCare Three, Natatab Rx, Equi-Natal Care, Inatal Advance, Inatal Ultra, Maternity Vitamin Low Iron, Ob-20, Prenatabs CBF, Prenatal Rx Low Iron, Vinate 90, Vinate M, Vinate Ultra, Prenate GT, Ferrex PC Forte, Trinate, Prenatal AD, Prenatal 19, Natalcare, Prenatal H, Duet Chewable, Natalfirst, Natelle, Cenogen Ultra, Prenatal-U, Nestabs FA, Vinate GT, Natafolic-PN, Cal-Nate, Icar Prenatal, Prenate Advance, Novastart, Novanatal, Natacaps, O-Cal Prenatal, NatalCare Advanced-RF, Duet DHA, Prenatabs OBN, Icare Prenatal Rx, Vinatal 600, Nutrispire, PrimaCare One, PrenaFirst, Natafolic-OB, , Choice-OB+DHA, Select-OB+DHA, Stuart One

Synonyms: n.a.

What is Provida DHA?

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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.

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