People want to use bleach and antiseptic for COVID and are calling us for advice

Through our work at the New South Wales Poisons Information Centre^[1], we’re used to receiving calls from concerned parents about what to do if their child has accidentally drunk some cleaning product. We also take calls from health professionals for advice on how to manage poisonings.

But over the past 18 months, we’ve seen an increasing number of people calling us about home remedies to prevent or cure COVID-19, particularly during an outbreak. They’re calling for advice before using items such as bleach or disinfectant. Or they’re calling to ask about side-effects after gargling, spraying or bathing in them.

When asked about the reason for using such products, callers say they did not know they could be harmful. Some say they thought it was better to do something, rather than nothing.

We’re concerned about the use of unproven COVID-19 home remedies. Here are some of the more common ones people have called our 24-hour poisons information service about, the types that can need medical care.

1. Inhaling hydrogen peroxide

Hydrogen peroxide is used in household disinfectants, chlorine-free bleaches, stain removers and hair dyes. And people have been calling about inhaling products containing hydrogen peroxide as a fine mist (called nebulising^[2]).

Hydrogen peroxide (1-1.5%) mouthwashes have been recommended^[3] as an antiseptic before a dental procedure. However, results about whether it kills SARS-CoV-2, the virus that causes COVID-19, are conflicting^[4].

Nebulising hydrogen peroxide can cause^[5] irritation and swelling to the nose, throat and lungs. People can develop a cough and become short of breath; it can cause persistent damage to the lungs. These symptoms can be misinterpreted as a lung infection. If you have COVID-19, nebulising hydrogen peroxide can make you sicker and prolong your recovery.

People also report nausea and vomiting after nebulising hydrogen peroxide. The risk is increased with solutions of higher concentrations, although we do not believe any concentration is safe.

Read more: Thinking of trying ivermectin for COVID? Here's what can happen with this controversial drug^[6]

2. Gargling or swallowing antiseptics

People have also called about gargling or swallowing strong antiseptics. These can cause irritation, swelling and pain to the mouth, as well as vomiting, diarrhoea and stomach pains.

Gargling or swallowing corrosive^[7] household cleaning products, such as the type you’d use in your kitchen or bathroom, is particularly unsafe^[8]. This can lead to life-threatening injuries, including rupture and bleeding of the upper gut, between the mouth and stomach.

A recently promoted^[9] home remedy is gargling antiseptics containing povidone-iodine.

Some low concentration (0.5-1%) of products containing povidone-iodine can be gargled. And povidone-iodine (0.5%) mouthwash has been recommended before a dental procedure to prevent transmission^[10] of SARS-CoV-2^[11].

Small pilot studies^[12] have suggested that similar low-strength gargle and nasal sprays may shorten the survival of SARS-CoV-2 in the nose and mouth. But these results should be confirmed in larger studies.

Although some people are allergic to povidone-iodine, low concentration solutions are usually safe^[13] when applied in the nose or mouth for a few months.

However, many products contain much higher concentrations of povidone-iodine and other chemicals designed for use on the skin.

So swallowing, gargling or inserting these products in the nose is not recommended.

Read more: Gargling with iodine won't stop you getting COVID^[14]

3. Bathing in bleach or disinfectant

Bathing in household cleaning products (such as bleach or disinfectant), or applying them directly to the skin, can cause mild-to-moderate irritation and rashes.

Burns^[15] can occur^[16] with stronger products^[17].

Read more: Bleach, bonfires and bad breath: the long history of dodgy plague remedies^[18]

4. Spraying face masks

Routinely spraying disinfectants into face masks, and then breathing in the fumes and residue for a prolonged period, can also harm.

This can result in irritation to the throat and lungs, dizziness, headache and nausea.

References

1. ^{^} New South Wales Poisons Information Centre (www.poisonsinfo.nsw.gov.au)
2. ^{^} nebulising (theconversation.com)
3. ^{^} have been recommended (pubmed.ncbi.nlm.nih.gov)
4. ^{^} are conflicting (pubmed.ncbi.nlm.nih.gov)
5. ^{^} can cause (pubmed.ncbi.nlm.nih.gov)
6. ^{^} Thinking of trying ivermectin for COVID? Here's what can happen with this controversial drug (theconversation.com)
7. ^{^} corrosive (pubmed.ncbi.nlm.nih.gov)
8. ^{^} particularly unsafe (pubmed.ncbi.nlm.nih.gov)
9. ^{^} recently promoted (www.rollingstone.com)
10. ^{^} prevent transmission (pubmed.ncbi.nlm.nih.gov)
11. ^{^} of SARS-CoV-2 (pubmed.ncbi.nlm.nih.gov)
12. ^{^} Small pilot studies (pubmed.ncbi.nlm.nih.gov)
13. ^{^} usually safe (pubmed.ncbi.nlm.nih.gov)
14. ^{^} Gargling with iodine won't stop you getting COVID (theconversation.com)
15. ^{^} Burns (pubmed.ncbi.nlm.nih.gov)
16. ^{^} can occur (pmj.bmj.com)
17. ^{^} with stronger products (www.ncbi.nlm.nih.gov)
18. ^{^} Bleach, bonfires and bad breath: the long history of dodgy plague remedies (theconversation.com)
19. ^{^} Shutterstock (www.shutterstock.com)
20. ^{^} side-effects (www.nps.org.au)
21. ^{^} Vitamins and minerals aren't risk-free. Here are 6 ways they can cause harm (theconversation.com)
22. ^{^} reported in people overseas (www.nps.org.au)
23. ^{^} Poisons Information Hotline (www.poisonsinfo.nsw.gov.au)