Active Ingredient

Cefdinir

Cefdinir is an antibiotic that belongs to the cephalosporin class. It is commonly used to treat a variety of bacterial infections.

This medication is effective against certain types of bacteria and is often prescribed when other antibiotics are not suitable.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Cefdinir Brands

Omnicef

Strengths 300mg

Cefdinir is used to treat several types of bacterial infections. It works by stopping the growth of bacteria.

Cefdinir works by inhibiting the synthesis of the bacterial cell wall, which is essential for bacterial survival.

As a cephalosporin antibiotic, it binds to specific proteins in the bacteria, leading to the disruption of cell wall production.

This results in the death of the bacteria and helps to clear the infection.

Not everyone experiences side effects when taking Cefdinir, and many are mild and temporary.

If you experience serious or persistent symptoms, contact your healthcare provider.

How long does it take for Cefdinir to work?

Cefdinir usually starts working within a few days. However, it is important to complete the full course as prescribed.

Can I take Cefdinir if I have a penicillin allergy?

Inform your doctor about any allergies. Some people with penicillin allergies may also be allergic to cephalosporins like Cefdinir.

What should I do if I miss a dose of Cefdinir?

Take the missed dose as soon as you remember. If it’s almost time for your next dose, skip the missed one and continue with your regular schedule.

Can I drink alcohol while taking Cefdinir?

It’s best to limit alcohol consumption while taking Cefdinir to avoid any potential interactions or side effects.

Are there any foods I should avoid while taking Cefdinir?

Avoid taking antacids or iron supplements close to your Cefdinir dose, as they can interfere with its absorption.