Treatment is not always successful 
Metronidazole
Adult: 250mg TID x 7-10 days
Children: 5mg/kg TID x 7 days (max dose 500mg TID)
Albendazole
400mg PO daily x 5-10 days
Tinidazole
Adult: 2 grams PO x 1 dose
Children: 50mg/kg PO x 1 dose
Quinacrine
> 8 years old: 100mg TID x 7 days
< 8 years old: 2mg/kg TID x 7 days
Nitazoxanide
> 12 years old: 500mg BID x 3 days
4-11 years old: 200mg BID x 3 days
12-47 months old: 100mg BID x 3 days
Adult: 250mg TID x 7-10 days
Children: 5mg/kg TID x 7 days (max dose 500mg TID)
400mg PO daily x 5-10 days
Adult: 2 grams PO x 1 dose
Children: 50mg/kg PO x 1 dose
> 8 years old: 100mg TID x 7 days
< 8 years old: 2mg/kg TID x 7 days
> 12 years old: 500mg BID x 3 days
4-11 years old: 200mg BID x 3 days
12-47 months old: 100mg BID x 3 days
Strict adherence to handwashing (toileting, diaper changes, playing with pets, etc)
Treat household members and/or sexual contacts if infected
Treat asymptomatic infections in those at high-risk of transmitting to others (children in daycare, food handlers, etc) or those at risk of chronic symptoms
Reinfection universal within 3 months in heavily infected endemic areas; treatment is not cost-effective in this setting
Giardia lamblia
Viral 
Helicobacter pylori
Bacterial
Balantidium coli
Campylobacter
Clostridium difficile
Shigella