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A.18 - Hypochlorous acid (HOCl)
MSF supports the application for the inclusion of aqueous hypochlorous acid (HOCl) in the
WHO Model List of Essential Medicines, in section 15.1 (Antiseptics) and 15.2
(Disinfectants), and section 13 (Dermatological medicines).
Hypochlorous acid is a chlorine generating disinfectant. The active chlorine released by
hypochlorous acid has a broad spectrum of bactericidal, virucidal, and fungicidal activity and
is also a wound-cleansing agent, with antiseptic and healing properties, for the treatment of a
variety of skin disorders.
Hypochlorous acid is a well-studied, non-toxic, non-corrosive, easy to use compound, and a
more effective and a safer alternative to other chlorine generating disinfectant agents, such as
sodium dichloroisocyanurate (NaDDC).
The European Chemical Agency (ECHA) lists hypochlorous acid as a biocide product type 1
(human hygiene), product type 2 (surface disinfection), product type 3 (veterinary hygiene),
type 4 (food and feed area) and type 5 (drinking water).
Hypochlorous acid has been also approved by the US Food and Drug Administration (FDA)
for disinfection of food-contact surfaces, for high level disinfection and sterilization of
medical instruments, for topical applications, for use in drinking water and as a no-rinse food
sanitizer.
In 2020, due to the need of specific guidance in the context of COVID-19 pandemic,
hypochlorous acid has also been listed in the following documents:
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The WHO list of coronavirus-effective biocides (Cleaning and disinfection of
environmental surfaces in the context of COVID-19, WHO, 2020).
The United States Environmental Protection Agency (EPA) “N” list of Disinfectants
for use against SARS-CoV-2.
The Health Canada list of disinfectants with evidence for use against COVID-19.
The Australian Register of Therapeutic Goods, as a hospital grade disinfectant
effective against COVID-19.