Vancomycin - c-diff is it used for?

Yes. Vancomycin can be used for the treatment of Clostridium difficile infection (c-diff).

The Clostridium difficile bacteria is normally present in the intestine. However, it may overgrow when antibiotics are taken. The bacteria release a powerful toxin that causes the symptoms. The lining of the colon becomes inflamed and bleeds, and takes on a characteristic appearance called pseudomembranes.

Treatment

The antibiotic or other medicine causing the condition should be stopped. Metronidazole is usually used to treat the disorder, but vancomycin or rifaximin may also be used.

Electrolyte solutions or fluids given through a vein may be needed to treat dehydration due to diarrhea. In rare cases, surgery is needed to treat infections that get worse or do not respond to antibiotics.

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from http://www.drugs.com/enc/pseudomembranous-colitis.html

For more information see http://www.drugs.com/cg/clostridium-difficile-infection.html