NataChew and Warfarin

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.

Rarely, vitamin supplements containing vitamin K may reduce the effectiveness of warfarin. This may be more likely to occur in individuals who have low levels of vitamin K in their blood. Before using any vitamin supplement, you should check the label to make sure it does not contain vitamin K. If it does, let your doctor know before you start using it. You may need more frequent monitoring of your INR after starting the supplement or whenever it is discontinued, and appropriate adjustments made in your dosage if necessary. It is important to tell your doctor about all other medications you use, including other nutritional supplements and herbs. Do not stop using any medications without first talking to your doctor.

MONITOR: Multivitamin preparations containing vitamin K may antagonize the hypoprothrombinemic effect of oral anticoagulants in some patients. Vitamin K1 in its active, reduced form serves as a cofactor in the generation of functional clotting factors, during which it becomes oxidized. It is reactivated in a process that is inhibited by oral anticoagulants, thus intake of additional vitamin K through supplements or diet can reverse the action of oral anticoagulants. Although the amount of vitamin K in over-the-counter multivitamin preparations is generally well below the dose thought to affect anticoagulation, there have been isolated case reports of patients stabilized on warfarin whose INR decreased following initiation of a multivitamin supplement and returned to therapeutic levels upon cessation of the multivitamin. Increases in warfarin dosage were required in some cases when the multivitamin was continued. One patient whose warfarin dosage was increased developed a subcapsular hematoma in her right kidney two weeks after she discontinued the multivitamin without informing her physician. Her INR was 13.2 and she was treated with vitamin K and fresh frozen plasma. It is possible that patients with low vitamin K status may be particularly susceptible to the interaction. Investigators have shown that vitamin K deficiency can cause an oversensitivity to even small increases in vitamin K intake. In one study where warfarin-stabilized patients were given a multivitamin tablet containing 25 mcg of vitamin K1 daily for 4 weeks, subtherapeutic INRs occurred in 9 of 9 patients with low vitamin K1 levels (4.5 mcg/L). INR decreased by a median of 0.51 and warfarin dosage had to be increased by 5.3% in patients with low vitamin K1 levels, whereas INR and warfarin dosage did not change significantly in patients with normal vitamin K1 levels. The prevalence of vitamin K deficiency may be small, but significant in the anticoagulated population. In a survey of 179 consecutive ambulatory patients on stable warfarin therapy attending an anticoagulation clinic, 22 (12.3%) were found to have vitamin K1 deficiency (

NataChew

Generic Name: multivitamin, prenatal

Brand name: NataChew, Select-OB, 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 NataChew?

Warfarin

Generic Name: warfarin

Brand name: Coumadin, Jantoven

Synonyms: n.a.

What is Warfarin?