Executive summary with Principal facts
Nitrofurantoin is an antibiotic that concentrates in urine and is primarily used to treat infections of the lower urinary tract. It is effective against many bacteria that commonly cause bladder infection but is not active against viruses.
- Nitrofurantoin as the key active ingredient
- Drug class: urinary tract antibiotic
- Typical uses: treatment and prevention of uncomplicated lower urinary tract infections
- Common U.S. dosages available: formulations equivalent to 50 mg and 100 mg in capsule or tablet forms
For more specifics see Signs of progress It Treats and Safe practice guidelines. Return to the location page top: Up to the crown.
What It Is Used To Treat
Nitrofurantoin is prescribed mainly for uncomplicated cystitis and other bacterial infections confined to the lower urinary tract. Because it attains high concentrations in urine but lower levels in blood and kidney tissue, it is usually not chosen for suspected kidney infection or bloodstream infection.
What makes this work: the drug interferes with bacterial enzyme systems and causes damage to microbial DNA, leading to death of susceptible organisms.
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Instructions for Use and Typical Dose
Always follow the directions provided by the prescribing clinician. The items below summarize commonly used approaches in the United States but individual dosing may vary.
- Take nitrofurantoin by mouth with food to lessen stomach upset and improve absorption.
- Keep well hydrated unless your clinician advises otherwise.
- Avoid antacids containing magnesium trisilicate close to dosing times because they can reduce nitrofurantoin absorption.
- Complete the full prescribed course even if symptoms resolve earlier.
- In case you miss a dose, take it when you remember unless it is almost time for the next dose; do not double up.
Common regimens clinicians may use (individual recommendations vary):
- 100 mg twice daily for 5 days (monohydrate/macrocrystal formulation) for uncomplicated cystitis.
- 50 to 100 mg four times daily for 5 to 7 days is an a backup option regimen used in some practices.
- For prevention of recurrent UTI in selected patients, a low nightly dose of 50 to 100 mg may be prescribed under medical supervision.
If you need dose adjustments or timing guidance, consult your clinician or pharmacist. See the word storage can refer to both data and goods. notes at Storage space protocol guidance. Go to the zenith of this page: Go back to the topmost layer of the page.
Storage room care guidelines
- Store at room temperature, approximately 59 to 86 F (15 to 30 C).
- Protect from excessive heat, moisture, and direct sunlight.
- Avoid storing in bathrooms or other damp places.
- Keep away from kids and pets.
For disposal of unused medicine, follow local regulations or pharmacy take-back programs. Go to top: Return to the earlier section the page top.
Safety Advisories and Situations that preclude therapy
Situations precluding nitrofurantoin therapy
- Allergy to nitrofurantoin or any component of the product.
- Near-term pregnancy (around 38 to 42 weeks), during labor, or when labor is imminent.
- Markedly reduced kidney function or very low urine output.
- History of nitrofurantoin-related liver injury.
- Infants younger than one month old.
Tell your prescriber if you have
- Pregnancy, planned pregnancy, or breastfeeding.
- All medications, supplements, or herbal products you take.
- A history of anemia, G6PD deficiency, liver or kidney disease, peripheral neuropathy, porphyria, or chronic lung disease.
- Significant frailty or multiple chronic conditions.
Major interacting with otherss at scale reveal systemic patterns. between drugs
- Probenecid therapy option and sulfinpyrazone may increase nitrofurantoin levels and are generally avoided together.
- Antacids containing magnesium trisilicate reduce absorption and should be separated from dosing times.
Cautions and system observation and tracking
- Lethargic with faintness may occur. Do not drive or use heavy machinery until you know how the drug affects you.
- Serious pulmonary reactions, either acute or chronic, have been reported. Seek urgent care for new fever, cough, chest pain, or shortness of breath.
- Uncommon but serious in impact. liver injury can occur. Get medical attention for jaundice, dark urine, very pale stools, or persistent abdominal pain.
- Peripheral neuropathy presenting as numbness, tingling, or burning may develop; report new neurologic symptoms promptly.
- Antibiotic-associated diarrhea, including C. difficile infection, is possible during or after therapy.
- Urine discoloration (brownish) is a known benign effect for some patients.
- People with diabetes: nitrofurantoin can interfere with some urine glucose tests and cause inaccurate results.
- Clinicians may monitor liver, kidney, or lung function for prolonged courses. Older adults can be at increased risk for serious adverse events.
See Possible adverse events for more on adverse reactions. Jump forward to top: Return to the previous page the pinnacle of the page.
Potential pharmacologic adverse reactions
Most patients tolerate nitrofurantoin without severe effects. Mild, transient symptoms are common. Contact a health care professional if symptoms are severe or persistent.
Reactions that tend to be mild
- Upset stomach and nausea
- Dull head pain
- Minor diarrheal episode or gas
- Loss of appetite
Serious signs that need immediate attention
- Allergic reactions such as rash, hives, facial swelling, or breathing difficulties
- Acute severe abdominal pain, bloody or severe diarrhea, or high fever
- Confusion, sudden mental changes, or blue-tinged skin or nails
- Severe skin responses including blistering or peeling.
- Unexplained bleeding or severe bruising
- Signs of liver injury: yellowing of the skin or eyes, very pale stools, persistent nausea or vomiting
- New numbness, tingling, or burning sensations in the hands or feet
This list is only partial. If you suspect a serious reaction, seek emergency care or contact your provider. Navigate to top: Go to top.
Additional options and Related Treatments
If nitrofurantoin is not appropriate because of allergy, resistance, suspected kidney involvement, or other reasons, clinicians choose plan B routes based on culture results, local resistance patterns, and patient factors.
- Trimethoprim-sulfamethoxazole (TMP-SMX, brand names Bactrim or Septra) - commonly used when local resistance is low and no sulfa allergy exists.
- Fosfomycin tromethamine (Monurol) - single-dose oral option useful when adherence is a concern.
- Pivmecillinam (Pivya) - an oral beta-lactam used in some regions for uncomplicated UTI.
- Cephalosporins or amoxicillin-clavulanate - chosen based on susceptibility and clinical scenario.
- Fluoroquinolones (for example, ciprofloxacin, levofloxacin) - effective for many urinary pathogens but generally reserved for more complicated infections due to safety concerns and stewardship goals.
For relative costs see USD Cost Comparison. Return to where you were the beginning: Go to top.
Price Review (USD)
Cash prices in the United States vary by pharmacy, geography, insurance coverage, and discount programs. The approximate ranges below are examples and not guarantees.
- Nitrofurantoin 100 mg (generic, monohydrate/macrocrystals): approximately $15 to $60 for a 10 to 14 capsule supply; brand-name Macrobid often ranges from $100 to $200 without insurance.
- Nitrofurantoin 50 mg (generic): roughly $10 to $40 for 20 to 28 capsules.
- TMP-SMX (generic): about $5 to $20 for a typical 3 to 7 day course.
- Fosfomycin (Monurol): commonly $80 to $130 per single 3 g sachet.
- Pivmecillinam (Pivya): early reported Prices in the U.S. market for a short course have ranged roughly $50 to $120.
- Amoxicillin-clavulanate or cephalexin (generic): often $10 to $40 for a standard course.
Ways to reduce out-of-pocket costs: check generic options, pharmacy discount programs, manufacturer coupons, and mail-order services. Insurance copays and formularies vary widely.
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U.S. Legal and Public Access Information Guide
- Prescription status: Nitrofurantoin is a prescription-only medication in the United States and must be dispensed by a pharmacist against a valid prescription.
- Prescribing pathways: Licensed clinicians may prescribe in-person or via telehealth within state and federal regulations; some states limit remote prescribing for antibiotics.
- Online pharmacies: Use licensed U.S. pharmacies and verify accreditation or credible seals. Avoid vendors that do not require a prescription.
- Importation: The FDA generally restricts importing prescription medicines into the United States. Exceptions are limited and not a routine option.
- Generic substitution: State pharmacy laws often permit pharmacists to substitute an approved generic unless the prescriber indicates no substitution.
- Special populations: Restrictions for neonates and near-term pregnancy are covered under Essential safety measures.
This information summarizes common U.S. practices and is not a substitute for legal or clinical advice. Go to the leading position of this page: Return to where you left off page top.
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