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Very effective treatment for giardiasis is available. There is little to choose in efficacy between the major drugs I have mentioned, used at optimum dosage, but mepacrine probably has a higher frequency of unwanted effects than many of the newer drugs, and the required duration of treatment is longer. Tinidazole is a very promising drug, being effective in single dosage with infrequent side effects.
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Richard Mendelson (1980) studied this question.
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