Benzac Ac (Benzoyl Peroxide)

What is Benzac AC?

Benzoyl peroxide has an antibacterial effect. It also has a mild drying effect, which allows excess oils and dirt to be easily washed away from the skin.


Benzac AC (for the skin) is used to treat acne. There are many brands and forms of benzoyl peroxide available. Not all brands are listed on this leaflet. Benzac AC may also be used for purposes not listed in this medication guide.

Important Information

Benzoyl peroxide can cause a rare but serious allergic reaction or severe skin irritation. Stop using Benzac AC and get emergency medical help if you have: hives, itching; difficult breathing, feeling light-headed; or swelling of your face, lips, tongue, or throat.

Before taking this medicine

You should not use benzoyl peroxide if you are allergic to it, or if you have:

  • very sensitive skin.

Ask a doctor or pharmacist if this medicine is safe to use if you have any skin conditions or allergies.

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

Do not use this medicine on a child without medical advice.

How should I use Benzac AC?

Benzac AC can cause a rare but serious allergic reaction or severe skin irritation. Before you start using Benzac AC, you may choose to apply a "test dose" to see if you have a reaction. Apply a very small amount of the medicine to 1 or 2 small acne areas every day for 3 days in a row. If there is no reaction, begin using the full prescribed amount on the 4th day.


Use exactly as directed on the label, or as prescribed by your doctor.

Do not take by mouth. Topical medicine is for use only on the skin. Do not use on open wounds or on sunburned, windburned, dry, or irritated skin. Also avoid using Benzac AC on wounds or on areas of eczema. Wait until these conditions have healed before using this medication.

Wash your hands before and after applying this medication.

Clean and pat dry the skin to be treated. Apply benzoyl peroxide in a thin layer and rub in gently.

Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you do not understand these instructions.

You may need to shake the medicine just before each use.

Do not cover the treated skin area unless your doctor has told you to.

Benzoyl peroxide may bleach hair or fabrics. Avoid allowing this medication to come into contact with your hair or clothing.

It may take several weeks before your symptoms improve. Keep using the medication as directed and tell your doctor if your symptoms do not improve.

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