Disease	Medication	Dosing	Cure rate	Common adverse effects
Giardiasis	Metronidazole (Flagyl)*†	Adults  500 mg twice daily for five to seven days or 250 mg three times daily for five to seven days Infants, children, adolescents  5 to 10 mg per kg three times daily for five to seven days; maximum of 250 mg per dose	80% when treating children Diarrhea resolution11	Central nervous system effects, disulfiram-like reaction when mixed with alcohol, gastrointestinal discomfort, headache, metallic taste, nausea, pruritus
	Nitazoxanide (Alinia)‡	Individuals older than 11 years  500 mg twice daily for three days Children four to 11 years of age  200 mg twice daily for three days Children one to three years of age  100 mg twice daily for three days	85% when treating children Diarrhea resolution11	Abdominal pain, bright yellow urine, headache, nausea
	Tinidazole†§	Adults  One 2-g dose Children older than three years  50 mg per kg in one dose, maximum of 2 g per dose	> 90% for children and adults Parasitic cure12,13	Central nervous system effects, disulfiram-like reaction when mixed with alcohol, gastrointestinal discomfort, headache, metallic taste, nausea, pruritus
Cryptosporidiosis	Nitazoxanide‡	Patients older than 11 years  500 mg twice daily for three days Children four to 11 years of age  200 mg twice daily for three days Children one to three years of age  100 mg twice daily for three days	80%14	Abdominal pain, bright yellow urine, headache, nausea
Cyclosporiasis	Sulfamethoxazole/trimethoprim*†	Adults  800 mg/160 mg twice daily for seven to 10 days Children  Limited data available	96%15	Anorexia, blood dyscrasias, Clostridioides difficile infection, diarrhea, hyperkalemia, hypersensitivity reactions, hypoglycemia, hyponatremia, kernicterus, liver injury, nausea, rash, vomiting
Trichinellosis	Albendazole*||	Patients older than six years  400 mg twice daily for eight to 14 days Children one to six years of age  5 to 10 mg per kg per day, divided twice daily for 10 to 15 days	Limited human data available	Abdominal pain, elevated liver function test, headache, increased intracranial pressure, nausea, reversible alopecia, vomiting
Pinworm	Albendazole*	Patients older than two years and adolescents  400 mg once; repeat in two to three weeks later Children two years and younger  200 mg once; repeat dose in three weeks	> 90%16	Abdominal pain, nausea, vomiting, headache, elevated findings on liver function tests, increased intracranial pressure, reversible alopecia
	Mebendazole¶	Adults  100 mg once; repeat in two weeks Children  Limited data available but two years and older, 100 mg once; repeat in two weeks	>90%16	Abdominal pain, angioedema, anorexia, diarrhea, dizziness, fatigue, fever, flatulence, headache, hepatitis, nausea, vomiting, weakness
	Pyrantel pamoate**	Patients older than two years  11 mg per kg once, followed by repeat dose two weeks later (maximum of 1 g per dose)	> 90%16	Nausea, vomiting, anorexia, abdominal cramps, diarrhea