ClearZal BAC (Benzalkonium chloride)

How does it work?

ClearZal BAC contains the active ingredient benzalkonium chloride, which is a type of medicine called an antiseptic.

Antiseptics (sometimes called germicides) are chemicals that kill or prevent the growth of micro-organisms such as bacteria, fungi, viruses, protozoa and bacterial spores.

Benzalkonium chloride acts by damaging the cell membranes of micro-organisms. This causes the chemicals essential for cell life to leak out and the micro-organism cell to die.

ClearZal BAC nail solution is used to treat infections of the nails caused by fungi, bacteria or viruses. These types of infections are often difficult to eradicate, because the nails are hard and difficult to penetrate and take a long time to grow as new healthy tissue.

Before applying the solution, the affected areas of nail should be cut and filed down as thoroughly as possible. This will allow the solution to penetrate the nail better. The surface of the nail should then be cleansed. ClearZal BAC is applied twice a day, around the nail, under the tip of the nail and the base of the nail. It can also be applied to the adjacent toenails or fingernails to prevent the spreading of the infection.

It is important that you continue the treatment without interruption until the infected section of nail has completely grown out; otherwise the infection will just come back. In general it can take six months treatment to clear up a fingernail infection and nine to twelve months for toenail infections. If there is no improvement after three months treatment you will need to see your doctor.

ClearZal BAC can be used with both nail varnish and artificial nails as they do not stop it from working.

If you are treating a toenail infection and you also have athlete's foot (tinea pedis), you should ask your pharmacist to recommend a separate medicine so you can treat this at the same time. This will help prevent the toenail getting reinfected. You can also use powders and sprays in your shoes to help keep them free from fungi.

What is it used for?

  • Mild fungal nail infections or bacterial nail infections.


  • This medicine is for external use only.
  • Avoid contact with eyes, ears and mucous membranes.
  • You must use the solution regularly and continue the treatment without interruption until the infected section of nail has completely grown out; otherwise the infection will just come back.
  • Always disinfect the nail file or nail clipper used to file or cut the infected nails after us, to prevent spreading microbes from nail to nail. You can use ClearZal BAC for this purpose.
  • If you get a rash or skin irritation during treatment you should stop using this medicine and consult your doctor.

Not to be used in

  • Children under six years old.
  • If you suffer from diabetes or poor blood circulation in your hands or feet, you should get advice from a health care professional before using this product.

This medicine should not be used if you are allergic to one or any of its ingredients. Please inform your doctor or pharmacist if you have previously experienced such an allergy.If you feel you have experienced an allergic reaction, stop using this medicine and inform your doctor or pharmacist immediately.

Pregnancy and breastfeeding

Certain medicines should not be used during pregnancy or breastfeeding. However, other medicines may be safely used in pregnancy or breastfeeding providing the benefits to the mother outweigh the risks to the unborn baby. Always inform your doctor if you are pregnant or planning a pregnancy, before using any medicine.

  • The safety of this medicine for use during pregnancy and breastfeeding has not been established. The medicine is unlikely to be absorbed into the body in significant amounts after being applied to the nails, but as there is no experience, the manufacturer states that it should not be used in women who are pregnant or breastfeeding. Seek medical advice from your doctor.

Side effects

Medicines and their possible side effects can affect individual people in different ways. The following are some of the side effects that are known to be associated with this medicine. Because a side effect is stated here, it does not mean that all people using this medicine will experience that or any side effect.

  • Burning sensation in area of use.

The side effects listed above may not include all of the side effects reported by the drug's manufacturer.For more information about any other possible risks associated with this medicine, please read the information provided with the medicine or consult your doctor or pharmacist.

How can this medicine affect other medicines?

This medicine is not known to affect other medicines.

Other medicines containing the same active ingredient

There are currently no other medicines for treating nail infections available in the UK that contain benzalkonium chloride as the active ingredient.