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Digging into Furazolidone's backstory means entering the world of mid-20th century drug innovation. Researchers chased better solutions to bacterial problems at a time when people died from infections modern medicine now treats effortlessly. Chemists first synthesized Furazolidone in the 1940s, drawing from nitrofuran compounds that held promise against hard-to-treat bugs. Across continents, laboratories reported that the new molecule showed strength where penicillin struggled, especially against gram-negative infections. In developing regions, this meant not just more prescriptions, but lives saved from foodborne illnesses and deadly diarrheal diseases. Looking at data from public health records, spikes in post-war survival rates owe a debt to such inventions. Generations of doctors leaned on Furazolidone, particularly in the 1960s and 1970s, before changes in drug regulations and resistance patterns forced a gradual step back. Stories shared by older pharmacists bring up memories of Furazolidone’s presence on hospital shelves—hospital corridors still echo with the names of drugs that shaped daily rounds.
Among the antibiotics populating the list of nitrofuran derivatives, Furazolidone carved out its own customer base. You find it in bright yellow crystalline powder form, usually mixed into oral tablets or suspensions. Some brands in the global market called it “Furoxone,” and in certain regions, it appeared on the label as “Furacolidonum.” Its main draws: strong activity against bacteria and protozoa, and stability in tablet form. For years, Furazolidone was packaged for both human and veterinary use, with dosing determined by weight and severity. In pharmacy storerooms today, Furazolidone packs sit alongside broad-spectrum antibiotics—though fewer physicians prescribe it now, some countries cite it as a cost-effective tool, especially for chronic or recurrent cases of bacterial gastroenteritis and traveler's diarrhea. That reputation for being affordable and accessible keeps it relevant in low-resource settings where options remain limited.
Furazolidone stands out on the shelf due to its deep yellow color and fine powder texture. The chemical structure owes much of its antimicrobial power to the nitrofuran ring fused with a hydantoin group. With a molecular formula of C8H7N3O5, the compound tips the scales at a molecular weight of 225.16 g/mol. Odorless, with a melting point typically reported near 250°C, Furazolidone doesn’t dissolve easily in water—pharmaceutical manufacturers use this to control release rates in different dosage forms. Solutions for lab analysis rely more on organic solvents than on standard tap water. Dust from handling can irritate the nose and skin, a small reminder of the molecule’s reactive groups.
Labeling rules for Furazolidone demand close attention to ingredient content and possible cross-reactivity. Each commercial package specifies exact milligram strengths—common products list anywhere from 50 mg to 100 mg per tablet. National pharmacopeias, including the US and European ones, required purity levels above 97%, with clear limits on byproducts left over from synthesis. Storage directions on bottles direct users to keep away from excessive heat and light, both of which can break down the nitrofuran ring. Packages for veterinary markets need to warn about withdrawal times for meat and milk, a legal protection reflecting concerns over residues. Doctors and pharmacists who saw the label in the past learned to watch for potential interactions, including a warning about monoamine oxidase inhibition.
Manufacturing Furazolidone at industry scale asks for precision and safety. The classic synthesis path begins with nitrofuran intermediates, such as 5-nitrofurfural, which undergoes a sequence of condensation, cyclization, and reduction. Each step introduces opportunities for unwanted side reactions, making strict temperature and pH control absolutely critical. Facilities must recycle or neutralize hazardous solvents and byproducts; regulations leave little wiggle room, especially after chemical disasters highlighted the risks tied to basic lapses. Some chemical suppliers adopted greener processes to reduce waste, focusing on optimizing yields while cutting the carbon footprint. Cleanroom environments prevent contamination that could spoil pharmaceutical-grade product.
Beyond its initial form, Furazolidone invites chemistry teams to explore ways of modifying either the nitrofuran ring or the hydantoin group. This tweaking can increase water solubility or alter how the body absorbs and metabolizes the drug. In lab research, derivatization sometimes reduces toxicity, making the molecule gentler on organs like the liver or kidney. Under controlled conditions, Furazolidone participates in reduction and hydrolysis reactions; both transformations affect its biological properties. With resistance rising, chemists are revisiting these modifications, hoping to build out new generations that can dodge bacterial defense strategies. Some papers point to potential for prodrug forms, chemical cousins that only activate once inside the body, reducing direct gut exposure and irritation.
Users tend to know drugs by trade names from pharmacy shelves, but researchers prefer systematic identifiers and synonyms. Furazolidone’s official international nonproprietary name (INN) matches its American and British counterparts—rare for older antibiotics. Other names include “Furazolidon,” “Furazolidonum,” and “Furoxone.” Animal health products might go by regional trade names or code numbers, depending on the supplier or local distributor. For research purposes, the compound number NSC-7138 sometimes appears in older scientific literature. Ingredient lists from generics manufacturers highlight active and inactive components, making cross-referencing possible for global buyers.
Health regulations surrounding Furazolidone tightened after reports linked long-term use to mild but concerning side effects. Any chemical that interacts with DNA, as nitrofurans can, pushes health authorities to scrutinize both short-term and chronic risks. Handling dust or powder in bulk requires respirators, gloves, and full lab attire. In hospitals and pharmacies, training ensures no mixing up of dosages or wrong patient selection, particularly for young children or pregnant women. Veterinary medicine laws specify withdrawal periods before animals can enter the food supply, reflecting ongoing public concern about residues. Each year, updates from authorities such as the US Food and Drug Administration or European Medicines Agency lead to revised safety data sheets and patient counseling materials.
Doctors have prescribed Furazolidone mostly for gut infections, treating diarrhea caused by E. coli, Salmonella, or Giardia. In some countries, veterinarians choose Furazolidone to control outbreaks among livestock, especially poultry and cattle, where bacterial threats can wipe out entire herds. For a stretch of decades, the drug was a staple for treating peptic ulcers caused by Helicobacter pylori, sometimes as part of combination therapy. In parts of Asia and Africa, where waterborne parasites and resistant bacterial infections spell disaster, Furazolidone still appears on public health lists. Some researchers are revisiting the drug in laboratory studies, pointing to strengths against certain protozoal flaws and even multidrug-resistant bacteria.
Slowing down the march of antibiotic resistance demands not just new drugs but fresh looks at established ones. I’ve followed academic teams repurposing Furazolidone in combination therapy, testing it with other agents to overcome resistance. Genetic studies explore how bacteria adapt to the drug, uncovering both target mutations and possible ways to reverse resistance. For drug-delivery researchers, Furazolidone acts as a test case for nanoparticles or slow-release formulations. Reports from scientific journals like Antimicrobial Agents and Chemotherapy often discuss tweaking side chains on the core molecule, hoping for a balance between antimicrobial strength and safety. Money for such research pools at government and non-profit agencies interested in global health, especially as pathogens shake off newer antibiotics.
Relentless scientific scrutiny put Furazolidone’s risks under the microscope. Animal trials from the 1970s onward found links between high doses and liver stress, sometimes tipping to cancer in lab rodents—this evidence drove restrictions in food animals across the US and Europe. Researchers explain the nitrofuran group’s tendency to generate reactive oxygen species, causing damage to cell DNA. In people, adverse effects mostly take the form of allergic responses, gastrointestinal upset, or mild anemia—usually with long-term exposure or overdose. Medical textbooks and national guidelines warn against combining Furazolidone with drugs like antidepressants, since dangerous blood pressure spikes can result from shared metabolic pathways. Integrating this science into pharmacy practice means tighter controls, stricter prescriptions, and real-time monitoring.
Current debates over the place of Furazolidone in therapy often come down to finding a balance between utility and safety. Medical professionals consider the old molecule as a fallback in resource-limited settings where resistance chokes other options. Research groups press on, mapping out derivatives that break away from the nitrofuran core or mask toxic groups. Public health planners keep the door open for Furazolidone, weighing new data from countries fighting ongoing outbreaks. Advances in formulation science may reduce exposure, making shorter treatment courses possible and improving patient adherence. Recognizing the lessons of Furazolidone’s rise and restraint, global drug policy remains adaptable—new outbreaks and evolving resistance patterns can push familiar drugs back into the spotlight if the science backs it up.
Doctors and pharmacists don’t really toss around furazolidone the way they do some antibiotics. Years ago, folks relied on it to treat a range of infections, especially in places where access to medicine stayed limited. Gastrointestinal bugs like cholera, bacterial diarrhea, and giardiasis topped the list. It’s easy to understand why doctors reached for it, seeing that untreated gut infections can drain whole communities, especially kids, of good health and well-being.
Furazolidone kills bacteria by interfering with their DNA, making it hard for germs to grow and multiply. Early studies in the mid-20th century reported strong results, especially for waterborne diseases that sweep through areas with weaker sanitation. In reality, furazolidone often made its mark in countries where the usual antibiotics came with price tags too high for the average clinic.
People tend to think of antibiotics as tools for treating humans, but furazolidone saw regular use in farm animals. In poultry and livestock production, it helped curb infections and, in some cases, produced more rapid weight gain for animals bound for market. Farmers saw this as a practical way to keep herds healthy and keep their businesses afloat. Farmers who make their living raising chickens or cattle—especially in parts of the world where disease can wipe out a year’s earnings—often saw it as a lifeline.
We can’t ignore the downsides. Over the years, scientists flagged furazolidone’s link to toxic side effects, including concerns around carcinogenicity. Animal studies suggested a real risk of certain cancers. Regulatory agencies in the US, Europe, and much of Asia grew uncomfortable, eventually pulling or restricting furazolidone. Today, most reputable public health experts in North America and Western Europe warn against its use in humans and food animals. Many countries banned it entirely in livestock after finding residues in meat and concerns about antibiotic resistance showing up in the food supply.
Hearing about another drug pulled for safety reasons might sound frustrating, but it points to a bigger pattern. The world now pays closer attention to how antibiotics impact everybody—not just the people who take them directly. Poor antibiotic stewardship lets resistant bacteria spread, turning tomorrow’s minor infections into major threats. Medications like furazolidone—once welcomed as heroes—forced medical professionals to ask tough questions about risk, benefit, and value. In places where modern antibiotics are still out of reach, some doctors may still rely on older drugs, but the risks weigh heavier than ever.
Stricter drug approval and food safety laws made a difference where they were enforced. Investing in better diagnostic tools and new antimicrobials helps, too, but they don’t go far enough in the world’s most vulnerable regions. Community health programs and international aid can give doctors and farmers safer choices, taking the pressure off risky drugs. Pushing for clean water and good sanitation might not sound high-tech, but it deals with the root cause of many infections that furazolidone once treated. My experiences working with rural clinics echo this—prevention beats scrambling for treatments after people fall sick.
Furazolidone’s story—one of utility, risk, and ultimately, replacement—reminds us to keep pushing for better health decisions. We owe it to everyone, from city hospitals to remote farms, to push for safe, modern medicines and broader protections against infection in daily life.
Furazolidone serves as a treatment for certain bacterial and protozoal infections. Doctors have used it for decades, especially where other medicines have failed or lost their power. Like every medicine with some muscle, it can bring a few side effects. Knowing what to expect makes a difference if you’re thinking about taking it or already have a prescription in hand.
People don’t often get excited about talking digestion, but furazolidone can give the gut plenty to complain about. Nausea crops up for a lot of patients. Vomiting sometimes comes along for the ride. The medicine may leave a bitter taste in the mouth, and for some, diarrhea follows soon after a dose. These issues usually hit early in the treatment plan and tend to settle down. Eating a light snack before swallowing the pill can sometimes help tame the discomfort.
Some folks spot a rash after starting furazolidone. The skin may itch, turn red, or form welts. This doesn’t mean every skin change spells danger, but allergic reactions deserve attention. Hives, swelling, or trouble breathing signal emergency territory. If these show up, it’s best to get help as soon as possible. Doctors sometimes see milder irritation, too, like peeling around the mouth. Always mention unusual skin shifts to your healthcare provider, no matter how small they seem.
I remember working the night shift once and seeing a patient complain about a pounding headache after starting medication. Furazolidone sometimes nudges headaches into people who haven't had one in ages. If a headache shows up and sticks around or keeps you from sleeping, it’s worth checking in with the clinic. Most headaches pack less punch than migraines, but pay attention if it seems out of the ordinary or pairs up with dizziness.
Rare stories come up where furazolidone tampers with blood health. Low white cell counts, anemia, or bruising without reason demand urgent medical checks. This side effect stays uncommon, especially if used for short bursts, but always watch for signs—like fatigue, odd paleness, or gums that bleed after brushing. Blood tests during treatment keep things on track, and a caring medical team can spot small issues before they turn big.
Folks taking antidepressants or certain pain medicines should talk shop with their doctors before starting furazolidone. The medicine can mix badly with other drugs that raise serotonin, raising the risk for something the docs call serotonin syndrome. Sweating too much, fast heartbeat, shaky hands, and confusion signal an emergency. Bringing up your medication list at every doctor’s visit sure helps here.
Clear communication makes furazolidone safer. Patients should keep a list of their symptoms and have phone numbers handy for questions about new or severe issues. Pharmacists stay sharp on medicine interactions. Nurses on the floor know how to connect dots between side effects and changes in a patient’s day-to-day habits. Together, the goal is a healthy finish line—no surprises, fewer bumps in the road, and the relief that comes from knowing what to expect before it happens.
Furazolidone comes up in conversations where tough bacterial or protozoal infections lead to stubborn diarrhea or stomach issues. For decades, it’s been a staple in managing conditions like traveler’s diarrhea or infections caused by contaminated water and food. Even as other antibiotics have taken center stage, furazolidone hasn’t faded away in many parts of the world, especially where access to newer drugs is limited.
Doctors usually suggest furazolidone in tablet or suspension form, with doses based on both age and weight. Adults tend to get 100 mg four times a day, spaced evenly, for about a week. Kids get doses based on how much they weigh, to prevent under- or overdosing—an important detail, since too much can make anyone sick. Missing a dose doesn’t just make germs stronger; it gives your gut a chance to play host again. Make a habit of setting alarms or linking doses with daily routines, like meals, and never double up if you forget.
Stomach upset makes most people wonder: should this be gulped down on an empty stomach or after food? Taking furazolidone after a meal reduces nausea for most people. The science backs this up; the stomach acid produced while eating helps manage the sharp taste and gentler absorption means fewer digestive side effects.
Furazolidone messes with certain foods. A big red flag goes up for aged cheese, wine, pickled goods, and processed meats—anything high in tyramine. Combining these with furazolidone can trigger dangerous blood pressure spikes, and I’ve seen outcomes go sideways fast for people who thought “just a little cheese” would be fine. Make a point to check labels and cut out these foods during your prescription and for a few days after.
Some drugs clash with furazolidone. Decongestants, certain antidepressants, and other antibiotics might ramp up the risk of complications. No one wants to visit an emergency room because a cold medicine didn’t play nice. Mention every prescription, supplement, and over-the-counter pill you’re taking, even if it feels unrelated. This single step often heads off a world of trouble.
Skipping doses lets bugs regroup. If you forget, just take the next one at the regular time—don’t double down. On the other side, using furazolidone too long encourages resistant bacteria. Only follow the length of treatment the doctor lays out; don’t stockpile leftovers for “later,” or share with friends, even if their stomach’s acting up, too. Each case calls for a specific plan.
No one likes feeling worse from their medication. Furazolidone can trigger headaches, stomach cramps, rash, or dizziness. Yellowing skin or urine, new bruises, or serious allergic reactions mean it’s time to put the pills down and see a doctor. I’ve known people who tried to tough it out, only to find themselves in much worse shape.
Furazolidone works best alongside clean water, good hygiene, and solid nutrition. Even the most effective drug can’t make up for untreated water or poor food safety. Sharing knowledge about dosage, avoiding certain foods, and full disclosure with care providers goes further than just swallowing a pill.
Doctors in different parts of the world keep using furazolidone because it knocks out certain gut bugs that don’t always respond to common antibiotics. Over the years, I have spoken with patients and fellow health professionals who appreciate the drug’s practicality for difficult infections like giardiasis or Helicobacter pylori. On the other hand, the medication brings its own list of hurdles, especially for folks with certain health backgrounds or those taking other drugs. Missing some of these safety stops creates serious problems that outweigh the benefits very quickly.
This drug belongs to the nitrofuran family, but it also acts as a monoamine oxidase inhibitor (MAOI). Mixing furazolidone with other drugs can land someone in the emergency room with high blood pressure or other dangerous symptoms. I’ve seen cases where folks didn’t realize their cold medication or even their favorite cheese had tyramine. This set off reactions like pounding headaches, chest pain, and sometimes deadly spikes in blood pressure.
Common drugs that clash with furazolidone include antidepressants (SSRIs, TCAs), amphetamines, and even some asthma inhalers. These combinations risk serotonin syndrome or hypertensive crises. Patients can avoid disaster by bringing an updated list of all medications and supplements they take to their doctor or pharmacist before starting furazolidone. No question is too small here—staying alive and safe felt more valuable than pretending to have all the answers.
Anyone dealing with kidney or liver trouble has to steer clear or use furazolidone only if regular antibiotics fail. The problem? These organs are responsible for filtering and breaking down medication. If they aren’t working well, the drug can build up in the body, creating toxic levels. People with G6PD deficiency — a genetic issue more seen in some Mediterranean, Asian, or African populations — face the risk of haemolytic anemia. Their red blood cells can burst, leading to sudden weakness, fast heart rate, or yellowing of the skin. Asking about family blood disorders or personal health history before prescribing can spare a lot of pain and hospital time.
Allergic reactions from furazolidone don’t just look like rashes. In rare cases, they show up as trouble breathing, swelling, or widespread hives needing urgent care. Anyone who has reacted badly to nitrofurans in the past needs to avoid this medication.
As for pregnancy, furazolidone crosses the placenta, and animal reports have raised red flags about birth defects. Doctors shy away from using the drug in pregnant or breastfeeding women unless there’s no other treatment option. Mothers shouldn’t have to choose between risking an unborn baby’s health and fighting off an infection.
Clear communication between patient and professional makes a huge difference. Doctors and pharmacists can step in with education on drug-food interactions. They can also set up medication reminders or check-ins to spot the first signs of side effects. Patients who ask questions and share honest health histories give themselves a better chance of safe recovery.
Furazolidone offers hope in tough medical cases, but its risks need respect. Taking the time up front to go over medications, diet, and health history paves the way for safer use. In my experience, rushing or leaving out details rarely ends well. Together, careful observation and honest conversation help keep furazolidone an option—not a hazard.
Furazolidone treats bacterial infections, often those in the gut like traveler’s diarrhea or cholera. Older generations remember seeing it in medicine cabinets before antibiotic options widened. As an antimicrobial, it has saved lives, but doctors now rarely reach for it in places with better alternatives. Newer drugs work with fewer side effects and problems.
The health of moms-to-be stays front of mind for families and healthcare workers. During pregnancy, anything entering a woman’s body crosses into sensitive territory. Medicines can find their way through the placenta and into a growing baby. With furazolidone, early animal studies turned up problems: high doses hurt developing embryos in rats and rabbits. Human data, though, is scarce, which means there’s lots we just don’t know.
Doctors today usually reach for antibiotics with a long safety record during pregnancy — options like penicillin or amoxicillin. These are better understood and less risky. Research on furazolidone remains stuck in older decades, with few modern guidelines supporting its use during pregnancy. Drug agencies classify it as risky, which should raise a red flag for any expectant mother or doctor thinking of using it without good reason.
The story with breastfeeding feels a lot like the one for pregnancy. Strong medicines often pass into breast milk. Even in small amounts, this can mean a baby faces unnecessary risks. No well-controlled studies detail how much furazolidone enters breast milk or how it affects infants. Without facts, doctors and parents stand on shaky ground if they choose this drug during breastfeeding.
Lower birth weight, risk of anemia, or longer-term issues could crop up. Most pediatric and obstetric groups warn against taking drugs like furazolidone unless absolutely necessary, simply because safer antibiotics exist. When a mother has a tough infection and no other meds work, doctors weigh risks closely, but that’s rare. Usually, other antibiotics get the first chance.
Medical care means more than clearing bacteria from the body. People want to know their treatment will not harm the next generation. Parents trust doctors to guide them toward options that keep both mothers and babies safe. Antibiotic resistance shows up more often, and sometimes therapy choices shrink. That makes honest conversations and up-to-date information even more valuable.
Doctors don’t make these choices alone. Expectant or nursing mothers get a seat at the table by asking about risks and alternatives. Pharmacists can help sort through options, putting science and experience to work. Public health guidelines get built on hard lessons learned over decades.
Today, few experts recommend furazolidone for pregnancy or breastfeeding when they have other options. Stepping back from risk often means better peace of mind. Families and doctors work together by asking questions and considering proven medications. When less information exists, like with furazolidone, most of the medical world avoids the gamble. That may mean the difference between a smooth recovery and worry that follows for years.
Keeping up with proven recommendations, checking on the latest safety updates, and choosing treatments supported by strong research helps protect not just patients, but communities too. Health workers hold the line against unnecessary risks — and personal experience shows better choices exist almost every time.
| Names | |
| Preferred IUPAC name | 3-[(5-nitrofuran-2-yl)methylideneamino]oxolan-2-one |
| Other names |
Furacin Furoxone Nitrofural |
| Pronunciation | /fjʊrəˌzɒlɪˈdoʊn/ |
| Identifiers | |
| CAS Number | 67-45-8 |
| Beilstein Reference | 1723077 |
| ChEBI | CHEBI:5166 |
| ChEMBL | CHEMBL1449 |
| ChemSpider | 7739 |
| DrugBank | DB00614 |
| ECHA InfoCard | 100.006.197 |
| EC Number | 3.5.4.3 |
| Gmelin Reference | 54255 |
| KEGG | C07422 |
| MeSH | D005691 |
| PubChem CID | 4033 |
| RTECS number | QU8400000 |
| UNII | 5D3O9MP01S |
| UN number | UN2811 |
| CompTox Dashboard (EPA) | DTXSID3020183 |
| Properties | |
| Chemical formula | C8H7N3O5 |
| Molar mass | 198.157 g/mol |
| Appearance | Yellow crystalline powder |
| Odor | Odorless |
| Density | 1.676 g/cm³ |
| Solubility in water | Sparingly soluble |
| log P | 0.06 |
| Vapor pressure | Negligible |
| Acidity (pKa) | 7.1 |
| Basicity (pKb) | 7.04 |
| Refractive index (nD) | 1.636 |
| Dipole moment | 5.60 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 309.85 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -178.6 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -2512 kJ/mol |
| Pharmacology | |
| ATC code | J01XE03 |
| Hazards | |
| Main hazards | May cause cancer, toxic by ingestion, may cause allergic reactions, harmful to aquatic life |
| GHS labelling | GHS05, GHS07, GHS08 |
| Pictograms | GHS05,GHS07 |
| Signal word | Warning |
| Hazard statements | H302: Harmful if swallowed. |
| Precautionary statements | P261, P264, P270, P272, P273, P280, P301+P312, P302+P352, P305+P351+P338, P308+P313, P321, P330, P332+P313, P362+P364, P405, P501 |
| Flash point | 79.7°C |
| Autoignition temperature | 540°C |
| Lethal dose or concentration | LD₅₀ (oral, rat): 850 mg/kg |
| LD50 (median dose) | LD50 (median dose): 157 mg/kg (oral, mouse) |
| NIOSH | N03AX75 |
| PEL (Permissible) | PEL (Permissible Exposure Limit) for Furazolidone: Not established |
| REL (Recommended) | 100 mg |
| IDLH (Immediate danger) | Not established |
| Related compounds | |
| Related compounds |
Nitrofurantoin Nifurtimox Nitrofurazone Nitrofurazone Metronidazole Tinidazole Secnidazole |
