What does antimalarial mean?
An antimalarial is any drug or agent used to prevent or treat malaria, the mosquito-borne parasitic disease that remains one of the world's deadliest infections. The word functions both as an adjective, describing something that acts against the malaria parasite, and as a noun, naming the medicine itself — doctors speak of 'antimalarial drugs', 'antimalarial prophylaxis', and 'antimalarial treatment'. Common examples include artemisinin-based combination therapies, chloroquine, mefloquine, and doxycycline, each suited to different regions and parasite strains. In everyday use, the term appears most often in travel medicine, where visitors to malaria-endemic regions are advised to begin antimalarial medication before departure, and in public-health discussions of drug resistance. Its etymology ties it to 'malaria', from the Italian 'mal'aria' meaning 'bad air', reflecting the old belief that foul air caused the disease. Precise, clinical, and globally significant, 'antimalarial' is a word whose importance is measured in lives saved.
A drug or agent used to prevent or treat malaria.
"Artemisinin-based combination therapies are now the standard antimalarials in most endemic countries."
Frequently used in the plural form 'antimalarials' when referring to classes of such drugs.
Acting against or effective in preventing or treating malaria.
"The researchers tested the compound's antimalarial activity against resistant parasite strains."
The plural typically refers collectively to multiple antimalarial drugs or agents rather than simply counting instances of the word.
"The pharmacy keeps a range of antimalarials in stock for travellers."
The first effective antimalarial came from tree bark — quinine, extracted from Andean cinchona bark, was curing fevers centuries before anyone had seen the parasite it fights.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of antimalarial
The word derives from 'malaria', which entered English from Italian 'mal'aria', literally 'bad air', a name rooted in the pre-scientific belief that the disease was caused by foul vapours from swamps — ultimately tracing back to the Latin roots 'malus' (bad) and 'aria' (air). As scientific understanding replaced the miasma theory after the discovery of the malaria parasite in the late nineteenth century, compounds formed with 'anti-' were created to denote agents combating the disease, giving rise to 'antimalarial'. It shares its 'mal-' heritage with words such as 'malady' and 'malaise', all stemming from the Latin sense of 'badness' or illness.
Related word forms
How antimalarial is actually used
Used chiefly in medical, pharmaceutical, and travel-health contexts; register is formal-to-neutral. The noun is often used attributively and in the plural ('antimalarials') when referring to drug classes.
Easily confused with antimalarial
'Malarial' means relating to or affected by malaria, whereas 'antimalarial' means acting against malaria.