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Vancomycin (oral)

Brand names: Firvanq, Vancocin

Oral vancomycin treats C. diff infection of the colon. Taken by mouth, it stays in the gut.

Brand namesFirvanq, Vancocin
Type of medicineAntibiotic
Prescription?Prescription
ImportantThis page is general information, not a prescription. Don't start, stop, or change a medicine without talking to your provider or pharmacist.

Overview

IV vancomycin is a different use, for serious infections like MRSA in the hospital.

What it's used for

  • C. diff colitis

How to take it

  • Take it every 6 hours for the full course, usually 10 days.
  • Wash hands with soap and water to prevent spreading C. diff.

Your dose depends on your health and other medicines. Always follow your prescription label, and ask your pharmacist if anything is unclear.

Side effects

Common side effects

  • Nausea
  • Belly pain
  • Bad taste
Call 911Severe belly pain or swelling, fever, or fainting
Call your provider todayDiarrhea returning after treatment ends

Warnings

  • Recurrence is common; call promptly if diarrhea comes back.

Other medicines, foods, and alcohol

  • Few interactions when taken by mouth.

Tell your provider and pharmacist about every medicine, vitamin, and supplement you take.

Pregnancy and breastfeeding

Talk with your provider.

Missed doses, overdose, and storage

If you miss a dose

Take it as soon as you remember. If it's almost time for the next dose, skip the missed one. Don't double up, and still finish the full course.

If someone takes too much

Call Poison Control at 1-800-222-1222 or get help online at poison.org. Call 911 if the person collapses, has a seizure, has trouble breathing, or can't be woken.

Storing it

Store at room temperature, away from heat and moisture (not in the bathroom), and out of reach of children and pets.

Conditions it's used for

Sources

Last updated 2026-11-13.