primaquine

[prahy-muh-kween]
noun Pharmacology.
a viscous liquid, C 1 5 H 2 1 N 3 O, used in the treatment of malaria.

Origin:
1945–50; < Neo-Latin prīma prime + quin(olin)e

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primaquine (ˈpraɪməˌkwiːn)
 
n
a synthetic drug used in the treatment of malaria. Formula: C15H21N3O
 
[C20: from prima-, from Latin prīmus first + quin(olin)e]

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Encyclopedia Britannica
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primaquine

synthetic drug used in the treatment of malaria, an infection caused by the protozoan parasite Plasmodium transmitted to humans by the bite of various species of Anopheles mosquitoes. Introduced into medicine in the 1950s, primaquine is one of an important series of chemically related antimalarial agents, the quinoline derivatives. It is administered orally as primaquine phosphate.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Clindamycin-primaquine may be used in patients who do not respond to standard therapies.
There is widespread resistance to standard anti-malaria drugs such as chloroquine or primaquine.
The patient recovered after treatment with doxycycline, quinine, and primaquine.
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