What kinds of treatment, including medication, did you receive for your giardiasis?
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How is giardiasis treated?
The most common treatment for giardiasis is metronidazole (Flagyl) for 5-10 days. It has an efficacy rate of 75% to 100%, but it often causes gastrointestinal side effects such as nausea and a metallic taste as well as dizziness and headache. Despite its effectiveness, metronidazole is not approved by the FDA in the U.S. for treatment of giardiasis.
Tinidazole has replaced furazolidone as the FDA-approved drug for treatment of the condition, and is highly effective at treating giardiasis (>90%). It also can be given as a single dose and is well tolerated. Furazolidone and Quinacrine are effective for treating giardiasis but are no longer available in the U.S. Paromomycin and albendazole are less effective than other treatments.
Occasionally, treatment fails to eradicate Giardia. In such cases, the drug may be changed or a longer duration or higher dose may be used. Combination therapy also may be effective (e.g., quinacrine and metronidazole).