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Quinacrine Treatment of Nitroimidazole-Refractory Giardiasis
Karin A Ydsten1, Urban Hellgren1,2, Hilmir Asgeirsson1,2
1Department of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden.
Background:
Limited evidence exists on efficacy and tolerability of quinacrine for nitroimidazole-refractory giardiasis.
Methods:
Nitroimidazole-refractory giardiasis cases, defined as microbiologically (microscopy and/or PCR) confirmed treatment failure after 2 courses, during 2008-2020, were retrospectively identified.
Results:
Of 87 patients, 54 (62%) had visited India. Quinacrine was used in 54 (62%); 51 received monotherapy and 3 combined with metronidazole. Only 3 had positive stool samples with persisting symptoms after quinacrine treatment (94% parasitological efficacy) and all were cured after a second treatment. One (1.9%) had mild adverse effects recorded.
Conclusions:
Quinacrine is an effective treatment for nitroimidazole-refractory giardiasis with good tolerability.
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