Bacteria Home > Ancef Dosage

Ancef is a prescription antibiotic that is given intravenously (by IV) or as an intramuscular (IM) injection to treat or prevent certain infections. The IV injections are typically used for more serious infections, while the IM injections are generally used for less serious infections. The Ancef dosage you receive will be based on your age, weight, and severity of your infection, among other factors.

An Introduction to Dosing With Ancef

The dosage of Ancef® (cefazolin) your healthcare provider recommends will vary, depending on a number of factors, such as:
  • Your age
  • Your weight
  • The type and severity of the infection being treated
  • How well your kidneys are functioning.
  • Other medical conditions you may have.
As is always the case, do not adjust your dosage unless your healthcare provider specifically tells you to do so.

What Is the Recommended Ancef Dosage for Treating Infections?

Although the recommended dosage for Ancef varies, the usual amount for adults typically ranges from 0.5 grams (500 mg), up to 1.5 grams (1500 mg), every 6 to 12 hours, given either intravenously (by IV) or by injection into a muscle (IM injection). In general, the more serious the infection, the higher and more frequent the amount. Also, for more serious infections, Ancef should be given by IV; IM injections are typically used for less serious infections.
For children, the dosage is calculated based on the child's weight, the severity of the infection, and the child's kidney function.

Ancef Dosing Guidelines for Preventing Surgical Infections

For preventing surgical infections in adults, the standard amount is a single dose of Ancef 1 gram given by IV 30 to 90 minutes before the first incision. For long surgeries that last two hours or more, a second dose may be given during surgery. After surgery, doses of 0.5 grams to 1 gram every six to eight hours are continued for one to five days.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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