• Cephalosporins

    Vitamin K - Supplementation Possibly Helpful
    These antibiotics work somewhat similarly to penicillin, but have been chemically modified to have a broader spectrum of effect.
    Drugs in this family include
    • cefadroxil (Duricef)
    • cephalexin (Cefanex, Keflex, Keftab, Biocef)
    • cephradine (Velosef)
    • cefaclor (Ceclor, Ceclor CD)
    • cefprozil (Cefzil)
    • cefuroxime (Ceftin)
    • loracarbef (Lorabid)
    • cefdinir (Omnicef)
    • cefixime (Suprax)
    • cefpodoxime proxetil (Vantin)
    • ceftibuten (Cedax)
    • and others
    Vitamin K
    Like all other antibiotics, cephalosporins might interfere with vitamin K levels by killing vitamin K–producing bacteria in the intestines. In addition, antibiotics in the cephalosporin family may also interfere with the way vitamin K works. 1 For this reason, taking extra vitamin K may be a good idea when using cephalosporins over the long term.


    1Shils M, et al. (eds.). Modern nutrition in health and disease, 9th ed. Baltimore: Williams and Wilkins, 1999: 1634.

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