Summary and Key Points

Nitrofurantoin is an oral antibiotic that concentrates primarily in urine and is used largely to treat uncomplicated bladder infections. It works by disrupting bacterial metabolic processes and damaging microbial genetic material. It does not treat viral infections.

• Active molecule: nitrofurantoin
• Therapeutic class: antibiotic for urinary tract infections
• Common clinical role: treatment and prevention of uncomplicated lower urinary tract infection
• Typical product strengths in the United States: formulations containing the equivalent of 50 mg or 100 mg per unit

See details on what it treats at Manifest signs - Lower Urinary Tract and safety notices at Safety Standards and Not suitable for use. Move back to the crown of the page: Go jump back to at the top of the page.

Signs - Lower Urinary Tract

Prescribers most often choose nitrofurantoin for uncomplicated cystitis and other infections confined to the bladder and lower urinary tract. Because urinary concentrations are high but blood and renal tissue exposure is lower, it is not the preferred choice for suspected kidney infection or bacteremia.

How it works internally: the agent interferes with multiple bacterial enzyme systems and causes damage to bacterial DNA, which leads to bacterial death for susceptible species.

Check special population guidance in Safety and Exclusion criteria for therapy Essentials. Come back toward the beginning: Revert to top.

How to take a sip Nitrofurantoin

Follow the dosage and administration instructions your clinician provides. The points below describe commonly used approaches in U.S. practice, but individual recommendations can differ.

• Take by mouth with a meal or snack to reduce stomach upset and to support absorption.
• Maintain usual fluid intake unless your clinician advises otherwise.
• Avoid antacid products that contain magnesium trisilicate close to the time you take the medicine, since they can lower absorption.
• Finish the entire prescribed course even if symptoms improve before it ends.
• If you miss a dose, take it when you remember unless it is almost time for the next dose; do not double the next dose.

Typical regimens used by clinicians in the United States include:

• 100 mg twice daily for 5 days using the monohydrate/macrocrystalline formulation for uncomplicated cystitis.
• Some practices use 50 to 100 mg four times daily for 5 to 7 days as an another route approach.
• For some patients with recurrent infections, a low dose at night such as 50 to 100 mg may be used for prevention under clinical supervision.

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• Keep at room temperature, roughly 59 to 86 F (15 to 30 C).
• Shield from strong heat, direct sunlight, and excessive humidity.
• Do not store medicine in bathrooms or other damp locations.
• Secure medication away from children and pets.

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Warning: Safety Information and Exclusion criteria for therapy

When nitrofurantoin should be avoided

• Known allergy to nitrofurantoin or any ingredient in the product.
• Near-term pregnancy, during labor, or when labor is imminent (typically around weeks 38 to 42).
• Significant renal impairment or very low urine output, where drug concentrations may not reach effective levels.
• Prior severe liver injury associated with nitrofurantoin.
• Infants under 1 month of age.

Inform your prescriber if you have

• Pregnancy, intent to become pregnant, or breastfeeding.
• All other medications, supplements, or herbal products you take.
• A history of anemia, glucose-6-phosphate dehydrogenase deficiency, liver or kidney disease, peripheral neuropathy, porphyria, or chronic pulmonary disorders.
• Advanced age, frailty, or multiple chronic medical issues.

High-stakes conversational exchanges create context for decisions. when medicines are used together

• Drugs such as probenecid and sulfinpyrazone can raise nitrofurantoin levels and are usually not coadministered.
• Antacids with magnesium trisilicate reduce absorption and should be spaced apart from nitrofurantoin doses.

Alerts with the act of monitoring

• Do not drive or operate heavy machinery until you know whether the drug causes drowsiness or dizziness for you.
• Report new fever, cough, chest pain, or difficulty breathing immediately; serious lung reactions have been reported in some patients.
• Seek medical care for signs of liver injury, such as yellowing of the skin or eyes, dark urine, or persistent abdominal pain.
• Report new numbness, tingling, or weakness in the hands or feet, which may indicate peripheral neuropathy.
• Antibiotic-associated diarrhea, including Clostridioides difficile infection, can occur during or after treatment.
• Urine may turn a brownish color in some patients; this is usually harmless but mention it to your clinician if you are concerned.
• People who use urine glucose test strips should be aware that nitrofurantoin may interfere with some tests and give inaccurate results.

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Possible Unwanted effects and warning signs

Most people tolerate nitrofurantoin well. Mild knock-on effects are common and usually temporary. Contact your health care provider if symptoms are severe or do not improve.

Mild or common reactions

• Feeling nauseous or mild stomach upset
• Headache
• Minor diarrhea or gas
• Appetite decreases

Signs that require immediate medical attention

• Allergic signs such as rash, hives, facial swelling, or shortness of breath
• Acute severe abdominal pain, bloody diarrhea, or high fever
• Confusion, sudden changes in mental status, or bluish discoloration of skin or nails
• Severe skin peeling, blistering, or other severe skin reactions
• Unexpected bleeding or easy bruising
• Symptoms of liver injury such as yellow eyes or skin, very pale stools, ongoing nausea or vomiting
• New onset numbness, tingling, or burning in hands or feet

These lists are not exhaustive. If you suspect a serious reaction, seek emergency care. Scroll to top: Navigate to this section top.

Insights from Comparisons of Nonconventional therapies

If nitrofurantoin is unsuitable because of allergy, resistance, suspected upper tract involvement, or other reasons, clinicians select broadened options based on culture data, local resistance patterns, and patient-specific factors.

• Trimethoprim-sulfamethoxazole (TMP-SMX, brands include Bactrim and Septra) - a common oral option when resistance is low and no sulfa allergy exists.
• Fosfomycin tromethamine (Monurol) - single-dose oral therapy that can be useful when adherence is a concern.
• Pivmecillinam (Pivya) - an oral beta-lactam agent used in some settings for uncomplicated UTI.
• Cephalosporins or amoxicillin-clavulanate - chosen based on susceptibility testing and clinical context.
• Fluoroquinolones (for example, ciprofloxacin and levofloxacin) - effective for many urinary pathogens but are generally reserved for more complicated infections because of safety concerns and antibiotic stewardship considerations.

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Compare across options prices while shopping in USD

Out-of-pocket prices in the United States depend on the pharmacy, region, insurance coverage, and discount programs. The ranges below are approximate and for illustration only.

• Nitrofurantoin 100 mg (generic, monohydrate/macrocrystalline): about $15 to $60 for a supply of 10 to 14 capsules at many retail pharmacies; brand Macrobid may cost roughly $100 to $200 without insurance.
• Nitrofurantoin 50 mg (generic): commonly around $10 to $40 for 20 to 28 capsules.
• Trimethoprim-sulfamethoxazole (generic): often $5 to $20 for a typical 3 to 7 day course.
• Fosfomycin (Monurol): single 3 g sachet frequently costs between $80 and $130.
• Pivmecillinam (Pivya): early reported U.S. market prices have varied, often in the $50 to $120 range for a short course.
• Amoxicillin-clavulanate or cephalexin (generic): typically $10 to $40 for a standard course.

To lower costs consider generics, pharmacy discount plans, manufacturer coupons, or mail-order retail pharmacies. Insurance formularies and copays vary widely.

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U.S. Access that is legal and Prescribing Notes

• Prescription requirement: Nitrofurantoin is a prescription-only medication in the United States and must be dispensed by a pharmacist against a valid prescription.
• Prescribing methods: Licensed clinicians may prescribe after an in-person visit or via telehealth where allowed by state and federal rules; some states have restrictions on remote prescribing of antibiotics.
• Online pharmacies: Use licensed pharmacies that require prescriptions and display accreditation or trust seals. Avoid vendors that ship without verifying a prescription.
• Importation rules: The FDA generally restricts importation of prescription medicines. Personal importation exceptions are limited and not a routine option.
• Generic substitution: State pharmacy regulations commonly allow pharmacists to substitute an approved generic product unless the prescriber prohibits substitution.
• Special rules: Neonates and near-term pregnancy have specific conditions that preclude use covered under Safety Principles and Situations that preclude therapy.

This summary reflects common U.S. practices and does not constitute legal advice. For specific legal questions consult an attorney or regulatory body. Take me to the top: Move to top.