Mouthwashes for Chemotherapy — Mouth Sores
Mouth sores are one of the most common side effects of chemotherapy. Two specific mouthwashes — chlorhexidine and benzydamine — are prescribed for different reasons, and knowing which does which can help you use them correctly.
Medically reviewed by Dr. Owais Mohammed, Medical Oncologist · Last reviewed September 2026
- Two different roles — Chlorhexidine targets infection. Benzydamine targets pain and swelling. They do different jobs.
- Alcohol-free only — Alcohol dries and irritates an already damaged mouth lining. Most standard mouthwashes contain it.
- Magic mouthwash is compounded — It is mixed by a dispensing pharmacy and is not a commercial product. Formulations vary between centres.
- Your team decides which — The mouthwash or combination prescribed depends on your treatment and how your mouth is responding.
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Your team may prescribe two mouthwashes for chemotherapy mouth sores: chlorhexidine, to reduce infection risk, and benzydamine, to ease pain and inflammation. Both should be alcohol-free. Ordinary alcohol-based mouthwashes, including most pharmacy brands, dry the mouth lining and make sores worse.
What does each mouthwash do, and why must it be alcohol-free?
Chlorhexidine — sold in India under brand names such as Hexidine and Periogard — is an antibacterial rinse. It reduces the number of bacteria in the mouth. This matters because the broken skin of a mouth sore becomes an entry point for infection, and chemotherapy suppresses the immune system that would normally contain it.
Benzydamine — most widely available as Tantum Verde — is an anti-inflammatory rinse that also numbs the surface of the mouth. It does not target bacteria. It is intended to reduce the pain and swelling that make eating and swallowing difficult when sores are active.
Both must be alcohol-free. When the mouth lining is already damaged and inflamed, alcohol dries and irritates the tissue further, worsens pain, and slows healing. Most standard supermarket and pharmacy mouthwashes — including well-known brands — contain alcohol, which is why they are not appropriate during chemotherapy.
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Did you know?
Oral mucositis — the medical term for mouth sores caused by cancer treatment — is among the most debilitating side effects of chemotherapy. MASCC/ISOO guidelines identify it as one of the leading reasons for dose reductions and treatment delays. The right mouth care protocol, started early, reduces how severe it becomes.
Source: MASCC/ISOO Clinical Practice Guidelines for the Management of Mucositis Secondary to Cancer Therapy
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Frequently asked questions
Can I use my regular mouthwash — the kind from the supermarket or pharmacy?
Most standard mouthwashes contain alcohol, including well-known brands. Alcohol dries and irritates the mouth lining, which is the opposite of what chemotherapy sores need. Unless your team has specifically said a product is safe for you, stay with what they have prescribed. If you are unsure about a product you already use, bring it to your next appointment and ask.
What exactly is magic mouthwash?
Magic mouthwash is a preparation compounded by a dispensing pharmacy, not a commercially sold product. Most formulations combine a local anaesthetic to numb the mouth lining with an antacid to coat and soothe it; some also include an antifungal preparation. There is no single standard recipe, and the version your team prescribes may differ from descriptions you find online. Use the preparation your own team has specifically provided for you.
Should I start rinsing before mouth sores appear, or only after they develop?
This is your treating team's decision. Some protocols begin mouth care from the first cycle of chemotherapy; others adjust based on the treatment being given and your individual risk. Ask your team whether you should be using the mouthwash now, or only if symptoms develop.
Can I use chlorhexidine and benzydamine at the same time?
If both have been prescribed to you, your team will advise on the sequence. Do not add a preparation that was not specifically prescribed for you, even if someone else receiving the same chemotherapy is using it. The combination your team chooses is based on your individual situation, not a general rule.
My mouth pain is severe and the mouthwash is not helping — what should I do?
Severe mouth pain during chemotherapy should be reported to your team, not managed on your own. There are stronger analgesic options, including preparations applied directly to the mouth. Continuing with a preparation that is not giving adequate relief without telling your team delays a change that could help you. Contact your team today rather than waiting for your next scheduled appointment.
Does chlorhexidine cause any side effects?
Chlorhexidine can cause temporary staining of the teeth and an altered sense of taste. Both usually resolve once the rinse is stopped. Some people find the taste unpleasant or that it stings. If it causes significant discomfort, tell your team — there may be an alternative approach that suits you better.
I have developed white patches in my mouth — could this be from the mouthwash?
White patches during chemotherapy are more likely to be oral thrush, a fungal infection that is common when the immune system is suppressed. It is not caused by the mouthwash. Oral thrush is treated with an antifungal preparation and will not resolve on its own. Tell your team rather than waiting for it to clear.
Is a warm salt-water rinse safe to use alongside the prescribed mouthwash?
A warm saline rinse — salt dissolved in boiled and cooled water — is often recommended as part of mouth care during chemotherapy and is not a medicine. MASCC guidance supports its use for routine oral hygiene. It is not a substitute for your prescribed mouthwash. Check with your team before adding it to confirm it fits with everything else you are using.
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