Furadantin Dosage

Recommended Dosage and Administration in Adult Patients

The recommended dosage is 50 mg to 100 mg of FURADANTIN four times a day.


For long-term suppressive therapy in adults, a reduction of dosage to 50 mg to 100 mg at bedtime may be adequate. The benefits of long-term suppressive therapy should be balanced against the increased potential for systemic toxicity and for the development of antibacterial resistance [see Warnings and Precautions (5.2, 5.4, 5.6)].


Administer FURADANTIN with food to improve drug absorption [see Clinical Pharmacology (12.3)] and, in some patients, tolerance.

Recommended Dosage and Administration in Pediatric Patients (1 month of age and older)

The recommended dosage of FURADANTIN is 5 mg/kg to 7 mg/kg of body weight per 24 hours, given in four divided doses in pediatric patients aged 1 month and older. Administer FURADANTIN with food to improve drug absorption [see Clinical Pharmacology (12.3)] and, in some patients, tolerance.


Table 1 lists individual dosage volumes for two different strengths of FURADANTIN (25 mg/5 mL and 50 mg/5 mL) based on body weight for pediatric patients.


Table 1: FURADANTIN Pediatric Dosing Table for Pediatric Patients 1 month of Age and Older

To measure the correct pediatric doses, it is important to administer FURADANTIN with an appropriate size oral dosing syringe with graduations that align with the volume prescribed in Table 1 above.


Continue therapy 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 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 and Precautions (5.2, 5.4, 5.6)].