How to Use Benzalkonium Chloride

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Benzalkonium Chloride is used as an antiseptic on surfaces and should not be taken internally, but it has been shown to affect the germs that cause cold sores and fever blisters. There are several concentrations of Benzalkonium Chloride sold in pharmacies. Always read the instructions on your product to determine the proper amount to use.

Things You'll Need

  • Soap and water
  • Benzalkonium Chloride in liquid form
  • Cotton tipped swabs

Carefully wash the affected area with soap and water. Be sure to remove makeup and dirt from the site.

Refer to your Benzalkonium Chloride product's label for any mixing instructions if you need to dilute it before application.

Dip a cotton swab into the Benzalkonium Chloride and apply directly to the fever blister or cold sore. Avoid rubbing too hard to prevent damage the skin.

Throw away the cotton swab and wash your hands.

Check the site for signs of relief. Apply up to two more doses for a total of three treatments per day. (See Warnings)

Tips & Warnings

  • Wait for at least one hour before brushing your teeth or drinking after applying Benzalkonium Chloride. Do not use for more than three days. Contact your doctor if you develop any new symptoms or signs of an allergic reaction (See Resources).

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