Furadantin Dosage

Generic name: nitrofurantoin
Dosage form: oral suspension

This dosage information does not include all the information needed to use Furadantin safely and effectively. See full prescribing information for Furadantin.

The information at Drugs.com is not a substitute for medical advice. ALWAYS consult your doctor or pharmacist.

Furadantin should be given with food to improve drug absorption and, in some patients, tolerance.


50-100 mg four times a day -- the lower dosage level is recommended for uncomplicated urinary tract infections.

Pediatric Patients

5-7 mg/kg of body weight per 24 hours, given in four divided doses (contraindicated under one month of age).

The following table is based on an average weight in each range receiving 5 to 6 mg/kg of body weight per 24 hours, given in four divided doses. It can be used to calculate an average dose of Furadantin Oral Suspension (25 mg/5mL) for pediatric patients (one 5-mL teaspoon of Furadantin Oral Suspension contains 25 mg of nitrofurantoin):

Body Weight               No. Teaspoonfuls
 Pounds    Kilograms    4 Times Daily
 15 to 26    7 to 11    1/2 (2.5 mL)
 27 to 46    12 to 21    1 (5 mL)
 47 to 68    22 to 30    1 1/2 (7.5 mL)
 69 to 91    31 to 41    2 (10mL)

Therapy should be continued for one week or for at least 3 days after sterility of the urine is obtained. Continued infection indicates the need for reevaluation.

For long-term suppressive therapy in adults, a reduction of dosage to 50-100 mg at bedtime may be adequate. For long-term suppressive therapy in pediatric patients, doses as low as 1 mg/kg per 24 hours, given in a single dose or in two divided doses, may be adequate. SEE WARNINGS SECTION REGARDING RISKS ASSOCIATED WITH LONG TERM THERAPY.

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