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Cephalosporins

These antibiotics work somewhat similarly to penicillin, but have been chemically modified to have a broader spectrum of effect.
Drugs in this family include
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.

References

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

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