- What is nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- What brand names are available for nitrofurantoin?
- Is nitrofurantoin (Macrobid, Macrodantin, Furadantin) available as a generic drug?
- Do I need a prescription for nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- Why is nitrofurantoin (Macrobid, Macrodantin, Furadantin) prescribed to patients?
- What are the side effects of nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- What is the dosage for nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- Which drugs or supplements interact with nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- Is nitrofurantoin (Macrobid, Macrodantin, Furadantin) safe to use during pregnancy or while breastfeeding?
- What else should I know about nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
What is nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
Nitrofurantoin is an antibiotic that is used for treating urinary tract infections caused by several types of bacteria. It is effective against E. Coli, Enterobacter cystitis, Enterococcus, Klebsiella, and Staphylococcus aureus. Nitrofurantoin interferes with the production of bacterial proteins, DNA, and cell walls. Bacteria cannot survive without a cell wall or multiply without DNA.
Three forms of nitrofurnatoin are available:
- Furadantin, a microcrystalline form,
- Macrodantin, a macrocrystalline, and
- Macrobid, a sustained release form of macrocrystalline used twice daily.
The macrocrystalline form is more slowly absorbed than the microcrystalline form and is useful for patients who cannot tolerate the microcrystalline form.
Why is nitrofurantoin (Macrobid, Macrodantin, Furadantin) prescribed to patients?
- Nitrofurantoin is used to treat or prevent urinary tract infections (UTIs).
What are the side effects of nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- Common side effects of nitrofurantoin include:
- The macrocrystalline form (Macrodantin) appears to cause less stomach upset. Stomach upset also can be minimized by using a lower dose or by taking nitrofurantoin with food or milk.
- Possible serious side effects include:
- Nitrofurantoin can cause serious lung injury. The reaction can occur within hours of the start of treatment if the patient has previously received nitrofurantoin, or within a few days of starting nitrofurantoin for the first time. Symptoms include:
other persons, lung injury may occur after approximately a month of treatment.
- Difficulty breathing
- Rapid breathing
- Fortunately, the symptoms usually resolve within a week if the medication is stopped. In other individuals, lung injury may not develop until after several months or years of therapy. Unless it is recognized and treated, this delayed lung injury can result in permanent lung damage that remains even after the drug is stopped.
- Nitrofurantoin can also cause damage to the sensory nerves of the arms and legs (peripheral neuropathy), which can cause tingling in the extremities. The condition can become severe and is more likely to occur in people with diabetes, vitamin B deficiency, or general debilitation.
- Reduced red blood cell count (anemia) by breaking red blood cells (hemolytic anemia) can occur from nitrofurantoin. This reaction occurs most frequently in persons with a deficiency of an enzyme called glucose--6-phosphate dehydrogenase that is very important to the survival of red blood cells.
- Nitrofurantoin also can cause liver damage leading to jaundice or a form of hepatitis that can be fatal. Elevated liver enzymes indicate liver damage and are a reason to stop the drug.
- Treatment with nitrofurantoin can cause urine to change color to a dark yellow or brown.
What is the dosage for nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- The recommended adult dose for treating urinary tract infections is 50-100 mg 4 times daily (Macrodantin, Furadantin) or 100 mg every 12 hours (Macrobid) for 7 days or for 3 days after obtaining sterile urine.
- Nitrofurantoin can be taken with or without meals. Taking it with meals increases its absorption into the body.
- The suspension can be mixed with water, milk, juice, or infant formula.
- It also is used once a day (or in some children, twice daily) to prevent urinary tract infections.
- It should not be used in persons with poor kidney function.
Which drugs or supplements interact with nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
- High doses of probenecid (Benemid) or sulfinpyrazone (Anturane) can partially block the kidneys' elimination of nitrofurantoin. This can increase the blood concentrations of nitrofurantoin and the risk of toxicity from nitrofurantoin.
- Concomitant administration of a magnesium trisilicate antacid may decrease the absorption of nitrofurantoin, reducing the effectiveness of nitrofurantoin.
- Nitrofurantoin may reduce the activity of live tuberculosis vaccine (BCG vaccine) and live typhoid vaccine. In laboratory tests, nitrofurantoin reduced the effect of quinolone antibiotics, for example, norfloxacin (Noroxin). Therefore, nitrofurantoin should not be combined with quinolone antibiotics.
Women's Conditions Resources
Is nitrofurantoin (Macrobid, Macrodantin, Furadantin) safe to use during pregnancy or while breastfeeding?
- Although there are no adequate studies of nitrofurantoin in pregnant women, many women have safely used it during pregnancy. However, nitrofurantoin should not be used near the time of delivery (38-42 weeks gestation) since it interferes with the immature enzyme systems in the red blood cells of newborns, damaging the cells and resulting in anemia.
- Nitrofurantoin is distributed into breast milk and should be used with caution in women who are breastfeeding.
What else should I know about nitrofurantoin (Macrobid, Macrodantin, Furadantin)?
What preparations of nitrofurantoin (Macrobid, Macrodantin, Furadantin) are available?
- Capsules: 25, 50, 75, and 100 mg.
- Oral suspension: 25 mg/5 ml.
How should I keep nitrofurantoin (Macrobid, Macrodantin, Furadantin) stored?
- All formulations should be kept at room temperature, 15 C TO 30 C (59 F to 86 F).
When was nitrofurantoin (Macrobid, Macrodantin, Furadantin) approved by the FDA?
- The FDA approved nitrofurantoin in 1953.
Daily Health News
Multimedia: Slideshows, Images & Quizzes
Urinary Tract Infection Quiz
How would you know if you had urinary tract infection (UTI)? Take the Urinary Tract Infection in Adult Quiz to learn the causes,...
Urinary Tract Infection (UTI) Symptoms, Diagnosis, Medication
Understand urinary tract infection (UTI) through pictures. Our experts describe urinary tract infection symptoms like pelvic...
Bladder Infections: UTI Causes, Symptoms, Treatments
Urinary tract infections (UTI), including bladder infections, affect women and men, causing UTI symptoms like kidney infection....
Bacterial Infections 101: Types, Symptoms, and Treatments
Learn more about bacteria and the most common bacterial infections. Get more information on bacterial skin infections, which...
Related Disease Conditions
Urinary Tract Infections (UTIs)
A urinary tract infection (UTI) is an infection of the bladder, kidneys, ureters, or urethra. E. coli, a type of bacteria that...
E. coli (0157:H7) (Symptoms, Treatment, Prevention)
There are many types of E. coli (Escherichia coli). E. coli can cause urinary tract and bladder infections, or lead to sepsis. E...
Liver disease can be cause by a variety of things including infection (hepatitis), diseases such as: gallstones, high...
Urinary Tract Infections in Children
Urinary tract infections (UTIs) are very common in children. Symptoms and signs include fever and abdominal pain. Associated...
Enterovirulent E. coli (EEC)
Enterovirulent Escherichia coli (E. coli) are strains of related bacteria that have a strong propensity to cause gastrointestinal...
Is a Urinary Tract Infection (UTI) Contagious?
Bacteria such as E. coli or Pseudomonas can cause a urinary tract infection (UTI). The incubation period for a UTI ranges from...
Is E. coli Contagious? (Symptoms and Cure)
E. coli is an infection found worldwide. There are several subtypes of the E. coli species. E. coli is transmitted from...
Treatment & Diagnosis
- Urinary Tract Infection FAQs
- Medication Disposal
- Dangers of Mixing Medications
- How To Reduce Your Medication Costs
- Pharmacy Visit, How To Get The Most Out of Your Visit
- Indications for Drugs: Approved vs. Non-approved
- Drugs: Buying Prescription Drugs Online Safely
- Drugs: The Most Common Medication Errors
- Kidney Infections During Pregnancy
- Generic Drugs, Are They as Good as Brand-Names?
Medications & Supplements
Prevention & Wellness
Health Solutions From Our Sponsors
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.