Furazolidone is a nitrofuran antibacterial. It is marketed by Roberts Laboratories under the brand name Furoxone and by GlaxoSmithKline as Dependal-M.
Furazolidone has been used in human and veterinary medicine. It has a broad spectrum of activity being active against
- Gram positive
- Gram negative
Use in humans 
In humans it has used to treat diarrhoea and enteritis caused by bacteria or protozoan infections. It has been used to treat traveler's diarrhoea, cholera and bacteremic salmonellosis. Use in treating Helicobacter pylori infections has also been proposed.
Furazolidone is also used for giardiasis (due to Giardia lamblia), though it is not a first line treatment.
As for all medicines the most recent local recommendations for its use should be always be followed. The usual dose is:
- Adult: 100 mg 4 times daily. Usual duration: 2-5 days, up to 7 days in some patients or 10 days for giardiasis.
- Child: 1.25 mg/kg 4 times daily, usually given for 2-5 days or up to 10 days for giardiasis.
Use in animals 
As a veterinary medicine, furazolidone has been used with some success to treat salmonids for Myxobolus cerebralis infections.
It has also been used in aquaculture.
Use in laboratory 
It is used to differentiate micrococci and staphylococci.
It is believed to work by crosslinking of DNA.
Side effects 
Furazolidone is no longer available in the US. Though an effective antibiotic when all others fail, against extremely drug resistant infections, it has many side effects, and as with other nitrofurans generally, minimum inhibitory concentrations also produce systemic toxicity (tremors, convulsions, peripheral neuritis, gastrointestinal disturbances, depression of spermatogenesis.) Nitrofurans are recognized by FDA as mutagens/carcinogens, and can no longer be used since 1991.