furalan

How long does Nitrofurantoin stay in your body?

The elimination half-life of nitrofurantoin is about 20 minutes (roughly 0.3 hours) for the parent drug in adults with normal kidney function — the time it takes the body to clear about half of it. As a rule of thumb, a medicine is mostly gone after roughly 4 to 5 half-lives, though this varies from person to person with age and kidney or liver function. The FDA/DailyMed nitrofurantoin labels (Macrobid, Macrodantin, Furadantin) do not print an explicit numeric elimination half-life; the Macrodantin label states the drug is "readily absorbed and rapidly excreted in urine," with about 35-38% of a 100 mg dose recovered unchanged in urine over 24 hours and low blood levels at therapeutic doses. Published pharmacology puts the serum (plasma) half-life at about 20 minutes, so the parent drug clears from the blood within a few hours. Nitrofurantoin is not a prodrug and has no active metabolite that outlasts it. Because it is eliminated mainly by the kidneys, blood levels run higher and it clears more slowly when kidney function is reduced — it is contraindicated when creatinine clearance is under 60 mL/min, and older adults (who more often have reduced kidney function) need extra caution. It is dosed several times a day precisely because it leaves the bloodstream so quickly; this short blood half-life is not a drug-test detection window.

This is general information, not medical advice. It doesn’t tell you when a drug test would read negative (tests detect substances for different, often longer, windows) or when it’s safe to take another dose — ask your pharmacist or prescriber. Source: Macrodantin (nitrofurantoin macrocrystals) Capsules — FDA label, Clinical Pharmacology / Pharmacokinetics.

Frequently asked questions

What does Furalan treat?

Furalan (Nitrofurantoin) may be used to treat escherichia coli infections, klebsiella infections, staphylococcal infections, urinary tract infections, based on NIH RxClass drug-classification data (conditions a drug may treat — not a verbatim copy of the FDA-approved label). This is general reference, not medical advice.

How much does Furalan cost?

Nobody can tell you what you will pay — your price is set by your insurer's formulary, your deductible and the pharmacy's markup, and none of those are published. What IS published is what the pharmacy paid to acquire it: about $2.11 per ml, per the CMS NADAC survey. Treat that as the floor, not the quote — ask the pharmacist for the cash price as well as your copay, because for cheap generics the cash price often wins. Pharmacies pay less for a same-class option, Bethkis — about $1.08 on the same basis.

Is there a coupon or discount for Furalan?

pharmaranks is an independent ratings site, not a pharmacy — we don't issue coupons or sell Furalan. To pay less, Furalan is already a generic — usually the lowest-cost version — so the main levers are comparing cash prices between pharmacies and using a pharmacy discount-card service. Prices vary by pharmacy, insurance, and location, so always confirm at the counter. This is general reference, not medical or financial advice.

Who makes Furalan?

Furalan is marketed by Chartwell Molecular. You can see Chartwell Molecular's full profile, rating, and other products on pharmaranks.

Is Furalan a brand-name or generic drug?

Furalan is a generic medication; its active ingredient is Nitrofurantoin. Generics contain the same active ingredient as the brand-name original and are usually lower cost.

Is Furalan available over the counter?

No. Furalan is a prescription (Rx) medication in the US — you need a prescription from a licensed clinician (in person or via telehealth); it isn't sold over the counter. For some conditions there are OTC alternatives — ask your pharmacist.

What forms does Furalan come in?

Furalan is currently marketed as tablet, per the FDA's National Drug Code Directory.

What class of drug is Furalan?

Furalan is classified as nitrofuran antibacterial, per the FDA's Established Pharmacologic Class.

Is Furalan FDA-registered?

Furalan is on record with the U.S. FDA under application number ANDA080017. You can verify this on its official FDA label.