# Nitrofurantoin

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DRUG INFORMATION

  ADULT
    - Adult Patients: 50 mg to 100 mg four times a day - the lower dosage level is
      recommended for uncomplicated urinary tract infections.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'dosage and
      administration', retrieved 2026-08-29
    - (2.3) 2.1 Recommended Dosage and Administration in Adult Patients The recommended
      dosage is 50 mg to 100 mg of nitrofurantoin oral suspension four times a day.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'dosage and
      administration', retrieved 2026-08-29
    - For long-term suppressive therapy in adults, a reduction of dosage to 50 mg to 100
      mg at bedtime may be adequate.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'dosage and
      administration', retrieved 2026-08-29

  CHILD
    - Nitrofurantoin oral suspension is contraindicated in pediatric patients younger
      than 1 month of age because of the possibility of hemolytic anemia due to immature
      erythrocyte enzyme systems (glutathione instability). [see Contraindications (4)
      and Warnings and Precautions (5.4) ] .
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'pediatric use',
      retrieved 2026-08-29
    - Adult Patients: 50 mg to 100 mg four times a day - the lower dosage level is
      recommended for uncomplicated urinary tract infections. (2.2) Pediatric Patients:
      5 mg/kg to 7 mg/kg of body weight per 24 hours, given in four divided doses
      (contraindicated under one month of age). (2.3) 2.1 Recommended Dosage and
      Administration in Adult Patients The recommended dosage is 50 mg to 100 mg of
      nitrofurantoin oral suspension four times a day.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'dosage and
      administration', retrieved 2026-08-29
    - (2.2) Pediatric Patients: 5 mg/kg to 7 mg/kg of body weight per 24 hours, given in
      four divided doses (contraindicated under one month of age).
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'dosage and
      administration', retrieved 2026-08-29

  RENAL IMPAIRMENT
    - Conditions such as renal impairment (creatinine clearance under 60 mL per minute
      or clinically significant elevated serum creatinine), anemia, diabetes mellitus,
      electrolyte imbalance, vitamin B deficiency, and debilitating disease may enhance
      the occurrence of peripheral neuropathy.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'warnings and
      cautions', retrieved 2026-08-29

  HEPATIC IMPAIRMENT
    - No liver-impairment dose in this label. Not a statement that none is needed.
      Source: Read and found silent: the US FDA label for nitrofurantoin
      (Nitrofurantoin), retrieved 2026-08-29

  PREGNANCY   [ AVOID ]
    The label says not to use it. Read the quote below before deciding.
    - Risk Summary Nitrofurantoin is contraindicated in pregnant women at term (38 weeks
      to 42 weeks gestation), during labor and delivery, or when the onset of labor is
      imminent because of the possibility of hemolytic anemia in the infant (see
      Clinical Considerations ).
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'pregnancy',
      retrieved 2026-08-29
    - Published epidemiological studies, including cohort studies and case control
      studies, have reported inconsistent findings related to nitrofurantoin use during
      the first trimester and risk of major birth defects.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'pregnancy',
      retrieved 2026-08-29
    - These studies cannot definitively establish the presence or absence of risk due to
      several methodological limitations.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'pregnancy',
      retrieved 2026-08-29

  BREASTFEEDING
    - Infertility Male Based on findings from a fertility study conducted in 36 healthy
      male volunteers and an animal fertility study, nitrofurantoin may reversibly
      decrease spermatogenesis [see Nonclinical Toxicology (13.1) ].
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'nursing
      mothers', retrieved 2026-08-29
    - Nitrofurantoin doses of 10 mg/kg/day or greater in healthy human males may produce
      a slight to moderate spermatogenic arrest with a decrease in sperm count.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'nursing
      mothers', retrieved 2026-08-29
    - • Lactation: Breastfeeding is not recommended in infants under one month of age or
      with glucose-6-phosphate dehydrogenase (G6PD) deficiency.
      Source: US FDA label for nitrofurantoin (Nitrofurantoin), section 'use in specific
      populations', retrieved 2026-08-29
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