Overview and Key Details
Nitrofurantoin is an antibacterial medication that concentrates in the urine and is used mainly for infections of the lower urinary tract. It is active against a number of bacteria that commonly cause bladder infections.
- The active ingredient listed is nitrofurantoin
- Therapeutic category: antibiotic for urinary tract infections (UTIs)
- Common uses and applications: treatment and prevention of uncomplicated bladder infections; not effective against viruses such as those that cause colds or flu
- Typical U.S. strengths: 50 mg and 100 mg formulations in capsules or tablets
Want specifics? Go to The Disorders It Addresses or assess Workplace recommended safety preventive precautions.
The Conditions It Addresses
Nitrofurantoin is prescribed for bacterial infections of the lower urinary tract, such as uncomplicated cystitis. Because the drug reaches high levels in urine but lower concentrations in blood and renal tissue, it is generally not the choice for suspected kidney (upper tract) infections or systemic sepsis.
Mechanism by which the drug acts: nitrofurantoin interferes with bacterial enzymes and damages microbial DNA, which results in bacterial death for susceptible strains.
For restrictions and key situations in which therapy is not appropriate, see Safety guidelines. Jump to content the uppermost part: Top
Taking and Typical Dose
Implement the instructions issued by the prescribing clinician. The following points summarize common recommendations used in the United States:
- Take nitrofurantoin by mouth with food to improve tolerability and absorption.
- Maintain adequate fluid intake unless directed otherwise by your clinician.
- Avoid antacids that include magnesium trisilicate during therapy because they can reduce how much drug is absorbed.
- Finish the entire course as prescribed even if symptoms improve before the medication is complete.
- When a dose is missed, take it as soon as you remember; if it is nearly time for the next dose, skip the i forgot to take the dose and continue. Do not take two doses in one go.
Examples of dosing regimens that clinicians sometimes use (individual dosing may 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 alternate regimen used in some situations.
- For recurrent UTI prevention in selected patients, 50 to 100 mg once nightly may be prescribed under supervision.
If you have questions about timing or dose adjustments, consult your health care provider or pharmacist. See optimized storage layouts improve overall efficiency. notes at Guidance for physical storage keeps goods safe and organized..
Online keep your items in secure storage until you need them. care guidelines
- Store at room temperature, about 59-86 F (15-30 C).
- Keep the medicine away from excess heat, moisture, and direct light.
- Do not keep medication in bathrooms or other damp areas.
- Keep out of the reach of children and household pets.
Safety and precautionary practices
When nitrofurantoin use is contraindicated
- Known allergy to nitrofurantoin or any ingredient in the product.
- Near term pregnancy (around 38-42 weeks), during labor, or when labor is imminent.
- Severely reduced kidney function or markedly decreased urine output.
- History of liver injury related to nitrofurantoin.
- Newborns in the initial month after birth.
Inform your clinician before starting
- If you are expecting, planning pregnancy, or breastfeeding.
- About all other medications, supplements, and herbal products you are taking.
- If you have allergies to drugs or foods.
- If you have a history of anemia, diabetes, kidney or liver disease, G6PD deficiency, peripheral neuropathy, porphyria, low vitamin B levels, or chronic lung disease.
- If you are frail or have significant comorbid conditions.
Potential drug the networked exchange of ideas warning considerations
- Probenecid medicine and sulfinpyrazone can raise nitrofurantoin concentrations and may increase unwanted health consequences; these combinations are typically avoided unless specifically directed.
- Antacids containing magnesium trisilicate can reduce absorption and should not be used close to dosing times.
This is not a full list of interactive engagements with others are the core of collaboration.. Look up information your prescriber or pharmacist before starting or stopping any medication.
Key continuous safety advisories and continuous monitoring
- May cause drowsiness or dizziness. Avoid driving or operating heavy machinery until you know how you react.
- Serious lung reactions, including acute or chronic pulmonary damage, can occur; some cases happen after long use and may appear without warning. Reach out to urgent care for fever, chills, chest pain, ongoing cough, or breathing difficulty.
- A rare but serious condition. liver damage has been reported. Contact a clinician if you notice yellowing of the skin or eyes, pale stools, persistent nausea, or upper abdominal pain.
- Peripheral neuropathy (nerve injury) with numbness, tingling, or burning can happen, especially in patients with underlying risk factors. Report new neurologic symptoms promptly.
- Antibiotic-associated diarrhea, including Clostridioides difficile infection, can occur during or after therapy. Seek care for severe, persistent, or bloody diarrhea.
- Long-term or repeated use may predispose to secondary infections.
- Urine may become discolored (brownish) while taking the drug; this is usually harmless.
- People with diabetes: nitrofurantoin can interfere with some urine glucose tests and give false readings.
- Doctors may monitor liver, kidney, or lung function during prolonged treatment. Older adults are at higher risk for some severe negative effects.
Pregnancy and lactation
- If you become pregnant while taking nitrofurantoin, contact your clinician to evaluate benefits and risks.
- Do not use at or near term pregnancy or during labor as noted above.
- Nitrofurantoin passes into breast milk. Avoid giving to nursing infants younger than one month; discuss breastfeeding with your clinician for older infants.
See Possible adverse events more details are available. Return to the scene you were in atop: Top
Side effects that may occur
Many patients experience no adverse reactions or only mild, short-lived symptoms. Contact a health care professional if negative effects are persistent or severe.
Usual or mild effects
- Gas or bloating
- Headache flare
- Nausea
- Mild loose stools
- Appetite waning
Get swift medical care for a sudden health issue. any of these serious signs
- Allergic signs: rash, hives, swelling of the face, mouth, lips, or tongue, throat tightness, or breathing difficulty.
- Severe or bloody diarrhea, severe abdominal pain, or high fever.
- Confusion, blue-tinged skin or nails, or sudden mental status changes.
- Visual changes, severe skin reactions, or blistering/peeling of the skin.
- Unexpected bleeding or bruising, prolonged weakness, or persistent severe head pain sensation.
- Signs of liver trouble: yellowing of the skin or eyes, very pale stools, persistent nausea or vomiting, or worsening abdominal pain.
- Breathing problems: fever, chest pain, persistent cough, or shortness of breath.
- New numbness, tingling, or burning in hands or feet.
Not all entries are shown in this list. If you suspect a medication-related problem, contact a health care provider or emergency services as appropriate.
Other Medications and Similar Medicines
If nitrofurantoin is unsuitable due to allergy, bacterial resistance, suspected kidney involvement, or other reasons, clinicians may choose different antibiotics guided by local susceptibility patterns and clinical guidelines.
- Trimethoprim-sulfamethoxazole (TMP-SMX; commonly called Bactrim or Septra) — a common option for uncomplicated cystitis when local resistance is low and no sulfa allergy exists.
- Fosfomycin tromethamine (Monurol) — a single-dose oral sachet that can be convenient when adherence is a concern.
- Pivmecillinam (Pivya) — an oral beta-lactam used for uncomplicated UTIs in some settings.
- Cephalosporins or amoxicillin-clavulanate — options depending on bacterial susceptibility and clinical context.
- Fluoroquinolones (for example, ciprofloxacin or levofloxacin) — effective for many urinary pathogens but generally reserved for more complicated infections because of safety criteria to evaluate and stewardship priorities.
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Retail cash prices in the United States depend on pharmacy, geographic area, insurance coverage, and discount programs. The ranges below are approximate and may vary.
- Nitrofurantoin 100 mg (generic, monohydrate/macrocrystals): about $15 to $60 for 10 to 14 capsules; brand-name Macrobid may cost $100 to $200 or more for a similar supply.
- Nitrofurantoin 50 mg (generic macrocrystals): roughly $10 to $40 for 20 to 28 capsules.
- TMP-SMX (generic): roughly $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 Prices in America have been reported in the $50 to $120 range for a short course.
- Amoxicillin-clavulanate or cephalexin (generic): often $10 to $40 for a standard course.
Money-saving tips: check pharmacy discount cards, manufacturer coupons, generic substitution options, and mail-order pharmacies to lower out-of-pocket costs.
U.S. Legal & Accessibility Information
- Prescription requirement: Nitrofurantoin is prescription-only in the United States and must be dispensed by a pharmacist following a valid prescription.
- Prescribing methods: Licensed clinicians in the U.S. may prescribe in person or via telehealth subject to applicable state and federal rules; some states have specific restrictions for remote prescribing.
- Online pharmacies: Use licensed U.S. pharmacies and inspect the documentation for accreditation or recognized seals. Do not obtain prescription antibiotics from sites that do not require a valid prescription.
- Importing medication: Bringing prescription medications into the U.S. from abroad is generally restricted by the FDA; narrow exceptions exist but are not routine.
- Substitution and labeling: State laws commonly permit pharmacists to substitute a generic equivalent unless the prescriber indicates otherwise. Identification may be required when picking up controlled or prescription medications.
- Special populations: Infants under one month and patients at term pregnancy have restrictions as noted under Guidelines for safe operation.
The section contains a summary of common U.S. practices and does not replace legal or clinical advice.
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