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Nitrofurantoin Dosage

If you are an adult taking nitrofurantoin in the form of Macrodantin or Furadantin, the recommended dose for treating a UTI is 50 to 100 mg four times daily, continued for at least three days after the infection has cleared. If you are taking it in the form of Macrobid, the recommended dosage of nitrofurantoin is 100 mg twice daily for seven days.

An Introduction to Dosing With Nitrofurantoin

The dose of nitrofurantoin (Furadantin®, Macrobid®, Macrodantin®) your healthcare provider recommends will vary, depending on various factors, such as:
  • The particular nitrofurantoin product
  • Your age
  • Your weight (for children)
  • Whether you are taking this medication to treat or to prevent bladder infections.
As is always the case, do not adjust your dosage unless your healthcare provider specifically tells you to do so.

Nitrofurantoin Dosage for Macrodantin and Furadantin

Furadantin (the liquid form) and Macrodantin (the regular capsule form) are usually taken four times a day to treat urinary tract infections (UTIs) or once daily to prevent them.
The recommended nitrofurantoin dosage for treating UTIs in adults is 50 to 100 mg four times daily, continued for at least three days after the infection has cleared. For uncomplicated infections, the lower amount is usually recommended. For long-term treatment to prevent UTIs in adults, a dose of 50 or 100 mg once daily at bedtime is usually sufficient.
The recommended dose of nitrofurantoin for treating urinary tract infections in children (age one month and older) is based on body weight. As a result, it is best if your child's healthcare provider weighs your child in order to determine an accurate dosage, especially if your child has not been weighed recently.
For treating bladder infections, nitrofurantoin is usually given four times a day. To prevent bladder infections in children, the medication is usually given once or twice a day.
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