Furon 500mg Tablet (Furazolidone): Complete Uses, Side Effects, and Safety Guide
Clinical Reference Standards: CDSCO (Central Drugs Standard Control Organisation), Indian Pharmacopoeia (IP) & WHO | Last Updated: September 2026
When to Call Your Doctor IMMEDIATELY
- Severe headache with a pounding heartbeat, stiff neck, sweating, or blurred vision after eating tyramine-rich food or drinking alcohol
- Swelling of the face, lips, or throat, or difficulty breathing
- Yellowing of the skin or eyes, dark urine, or severe upper abdominal pain
- Tingling, numbness, burning, or weakness in the hands or feet
- Unusual tiredness, pale skin, frequent infections, or easy bruising
- Blood in the stool or vomit, or severe abdominal pain
- Shakiness, sweating, confusion, or fainting that could indicate low blood sugar
- A new cough, chest tightness, or breathlessness
If experiencing severe symptoms, call emergency services immediately.
What is furon 500mg tablet used for?
This medicine is an oral antimicrobial tablet containing furazolidone 500 mg. It is used to treat certain bacterial and protozoal gut infections such as cholera and giardiasis, and it works by damaging the DNA of susceptible organisms. It must be taken exactly as prescribed, and alcohol and tyramine-rich foods must be avoided completely during treatment and for four days afterwards.
- Generic Name: Furazolidone (500mg)
- Manufacturer: Western Remedies
- Form: Allopathy
- Pregnancy Category: Consult doctor
- Prescription Required: Yes
🇮🇳 furon 500mg tablet के बारे में (Hindi Summary)
उपयोग: यह दवा फ्यूराज़ोलिडोन 500 मिलीग्राम की एक टैबलेट है, जिसका उपयोग मुख्य रूप से आंतों के कुछ बैक्टीरिया और परजीवी संक्रमणों के इलाज के लिए किया जाता है। इसे हैजा और जियार्डिया जैसे संक्रमणों में इस्तेमाल किया जाता है, और कभी-कभी एच. पाइलोरी के इलाज के संयोजन में भी दिया जाता है। यह दवा कीटाणुओं के डीएनए को नुकसान पहुँचाकर उन्हें बढ़ने से रोकती है। इसका सेवन डॉक्टर के निर्देशानुसार ही करें, और इलाज के दौरान तथा आखिरी खुराक के चार दिन बाद तक शराब तथा टायरामिन वाले खाद्य पदार्थ जैसे पुरानी चीज़, प्रोसेस्ड मीट, फर्मेंटेड सोया उत्पाद और यीस्ट एक्सट्रैक्ट बिल्कुल न लें।
साइड इफेक्ट्स: इस दवा के आम दुष्प्रभावों में जी मिचलाना, उल्टी, भूख कम लगना, पेट में असहजता, दस्त, सिरदर्द और थकान शामिल हैं। कुछ लोगों का पेशाब भूरा या पीला दिख सकता है, जो हानिकारक नहीं है और दवा बंद करने पर ठीक हो जाता है। लंबे समय तक या अधिक मात्रा में लेने पर हाथ-पैरों में झनझनाहट, सुन्नपन या जलन जैसी नसों की समस्या हो सकती है। शराब या टायरामिन वाले खाद्य पदार्थों के साथ लेने पर रक्तचाप अचानक बहुत बढ़ सकता है। अगर सांस लेने में कठिनाई, चेहरे या गले में सूजन, आँखों या त्वचा का पीलापन, बहुत गहरा पेशाब, असामान्य थकान या लगातार सुन्नपन हो, तो तुरंत डॉक्टर से मिलें।
सुरक्षा सलाह: इस दवा को डॉक्टर के बताए अनुसार ही लें और खुराक या अवधि में खुद बदलाव न करें। टैबलेट को पूरे पानी के साथ निगलें और पेट की परेशानी कम करने के लिए इसे भोजन के साथ लें। इलाज के दौरान और आखिरी खुराक के चार दिन बाद तक शराब तथा टायरामिन वाले खाद्य पदार्थ बिल्कुल न लें, क्योंकि इससे रक्तचाप खतरनाक रूप से बढ़ सकता है। अपने डॉक्टर को अपनी सभी दवाओं, सप्लीमेंट्स और हर्बल उत्पादों के बारे में बताएं। अगर चक्कर या नींद आने जैसा महसूस हो तो वाहन न चलाएँ और मशीन न चलाएँ। गर्भावस्था, गर्भधारण की योजना या स्तनपान के दौरान इस दवा का उपयोग करने से पहले डॉक्टर से सलाह लें।
💊 furon 500mg tablet Uses & Benefits
- [{"condition":"Cholera","description":"Used as an adjunct to fluid and electrolyte replacement in adults and older children to shorten the duration of diarrhoea and reduce the shedding of Vibrio cholerae, although it is not a substitute for rehydration.","evidence":"Established in older literature; now reserved for settings where safer alternatives are unavailable."},{"condition":"Giardiasis","description":"Used to treat intestinal infection caused by Giardia lamblia, helping to clear diarrhoea, bloating, and malabsorption, but it is generally considered a second-line option.","evidence":"Established but limited by safety concerns."},{"condition":"Helicobacter pylori infection","description":"Has been used as part of combination regimens for eradicating H.
- pylori in some regions, although current guidelines usually prefer other antimicrobials.","evidence":"Limited and region-specific."},{"condition":"Bacterial enteritis","description":"Sometimes used for susceptible bacterial diarrhoeas when culture and sensitivity support its use and other options are not suitable.","evidence":"Limited."}]
Off-label uses: [{"condition":"Travelers' diarrhoea","description":"Occasionally prescribed off-label for empirical treatment of acute watery diarrhoea in adults when a susceptible organism is suspected, but this is not a recommended first-line approach.","evidence":"Limited."}]
Primary treatment for: Gastrointestinal infections caused by susceptible bacteria and protozoa, including cholera and giardiasis.
Also treats: Helicobacter pylori infection as part of combination therapy, Susceptible bacterial enteritis
📋 Drug Information
| Generic Name(s) | Furazolidone (500mg) |
| Brand Name | furon 500mg tablet |
| Manufacturer | Western Remedies |
| Packaging / Form | Varies by brand (Allopathy) |
| Therapeutic Class | GASTRO INTESTINAL |
| Action Class | Nitrofuran & its derivatives |
| Route of Administration | Oral |
| Storage | Store this medicine at room temperature, ideally between 15°C and 30°C, in a dry place away from direct sunlight and moisture. Keep the tablets in their original container with the lid tightly closed, and keep the container out of reach of children and pets. |
| Shelf Life | Not established from the available information. Always check the expiry date printed on the pack and do not use the medicine after that date. |
| WHO Guideline | Not established from the available information. Current World Health Organization guidance generally favours other antimicrobials for cholera and giardiasis, and this medicine is not a first-line recommendation in most modern guidelines. |
| ICMR Guideline | Not established from the available information. Indian guidelines may mention this medicine for specific infections in settings where other options are not suitable, but it is not a preferred first-line agent. |
👨⚕️ Doctor's Practical Tips
Evidence-based practical advice from experienced clinicians
🔍 Is This Medicine Right for Your Symptom?
Educational reference. Always consult a doctor for diagnosis.
🔬 How This Medicine Works (Pharmacology)
Pharmacokinetics
How It Works
This medicine is a nitrofuran antimicrobial that is taken up by susceptible bacteria and protozoa, where it is reduced by microbial enzymes into highly reactive intermediates. These intermediates damage DNA, proteins, and other vital molecules inside the organism, which blocks its ability to grow and multiply. Because the activation depends on microbial metabolism, the medicine tends to affect susceptible organisms more than human cells, although some human tissues can also be affected when the dose is high or treatment is prolonged.
Mechanism Steps
💡 How to Take furon 500mg tablet
Strength: Immediate-release tablet containing 500 mg of furazolidone.
Dosage Information
| Adult Dosage | The usual adult dose of this medicine is one 500 mg tablet taken by mouth two to four times a day, but the exact dose and duration depend on the infection being treated, the person's age, weight, kidney and liver function, and how well they respond. Treatment is usually kept as short as possible because of the risk of nerve damage and other serious effects. Dose must be individualized by a qualified clinician based on indication, age, weight, renal and hepatic function, and the person should never adjust the dose without medical advice. |
| Pediatric Dosage | Pediatric dosing is not established from available information. Consult a pediatrician. This medicine is not recommended for infants under one month of age, and older children should only receive it when a qualified pediatrician has calculated the dose based on weight and the specific infection. |
| Elderly Dosage | Older adults may be more sensitive to the side effects of this medicine, especially low blood pressure, low blood sugar, and nerve-related symptoms. The dose should be reviewed carefully by a qualified clinician, taking into account kidney and liver function and other medicines being taken. |
| Renal Impairment | Not established from the available information. Because this medicine is excreted mainly in the urine, people with reduced kidney function may need a lower dose or a different medicine, and this decision must be made by a qualified clinician. |
| Hepatic Impairment | Not established from the available information. People with liver disease should use this medicine only under close medical supervision because rare cases of liver injury have been reported. |
| Maximum Daily Dose | Not established from the available information. The maximum daily dose must be determined by a qualified clinician based on the indication, the person's age, weight, kidney and liver function, and the balance of benefits and risks. |
Dosage Timeline
🍽️ Food Timing Guide
⏰ What to Do If You Miss a Dose
⚠️ Side Effects of furon 500mg tablet
✅ Common Side Effects
🚨 Serious Side Effects
⚠️ Rare Side Effects
Consult your doctor if you experience any unusual symptoms.
🔬 Drug Interactions
| Drug | Severity | Effect |
|---|---|---|
| Alcohol | Major | |
| Monoamine oxidase inhibitors | Major | |
| Tyramine-rich foods | Major | |
| Pseudoephedrine | Major | |
| Warfarin | Moderate | |
| Antidiabetic medicines | Moderate | |
| Tricyclic antidepressants | Moderate | |
| Phenytoin | Moderate | |
| Antacids | Minor | |
| Laxatives | Minor |
🚨 Major Interactions
- Alcohol-containing products
- Monoamine oxidase inhibitors
- Tyramine-rich foods
- Indirect sympathomimetics such as pseudoephedrine and amphetamines
⚡ Moderate Interactions
- Antidiabetic medicines
- Anticoagulants such as warfarin
- Tricyclic antidepressants
- Phenytoin
🍷 Alcohol Interaction
Alcohol must be completely avoided while taking this medicine and for at least four days after the last dose. Combining the two can cause a disulfiram-like reaction with flushing, severe headache, nausea, vomiting, sweating, a fast heartbeat, and a dangerous rise in blood pressure. In rare cases this reaction can be life-threatening, so even small amounts of beer, wine, or spirits are unsafe.
🔎 Check Your Other Medicines
Educational tool. Always confirm with your doctor or pharmacist.
🛡️ Safety & Warnings
🚫 Contraindications
["Known allergy to furazolidone or any other nitrofuran medicine","Infants under one month of age","Pregnancy at term or during labour","Breastfeeding","Inability to avoid alcohol or tyramine-rich foods during treatment","Severe liver disease","Glucose-6-phosphate dehydrogenase deficiency, because of the risk of breakdown of red blood cells"]
⚠️ Warnings & Precautions
["Do not drink alcohol or eat tyramine-rich foods during treatment and for at least four days after the last dose.","Prolonged use can cause peripheral neuropathy, so treatment should be kept as short as possible.","This medicine can cause low blood sugar, so people with diabetes should monitor their blood sugar closely.","Rarely, this medicine can cause liver injury, blood disorders, or severe allergic reactions.","Do not use this medicine to treat viral illnesses such as the common cold or flu.","Tell your doctor about all other medicines you take, including over-the-counter products and herbal supplements.","Avoid driving or operating machinery if you feel dizzy, drowsy, or unwell.","Keep out of reach of children and store in the original container."]
🤱 Lactation Safety
Not established from the available information. This medicine passes into breast milk, so breastfeeding should be avoided during treatment and for a few days afterwards unless a qualified clinician advises otherwise.
💊 Overdose Management
Overdose with this medicine can cause severe nausea, vomiting, diarrhoea, dizziness, and low blood pressure. There is no specific antidote, so treatment is supportive and focuses on replacing fluids and electrolytes, monitoring blood pressure and blood sugar, and watching for nerve or blood-related complications. If an overdose is suspected, contact a poison control centre or go to the nearest emergency department immediately, and take the medicine container with you.
⏰ Missed Dose
If you miss a dose, take it as soon as you remember, provided that less than half of the usual dosing interval has passed. If more than half of the interval has passed, skip the missed dose and continue with your regular schedule. Never take two doses at the same time to make up for a missed dose, and never change the prescribed schedule without speaking to your doctor.
Additional Safety Advice
Take this medicine exactly as prescribed by your doctor and do not change the dose or duration on your own. Swallow the tablet whole with a full glass of water, preferably with food, to reduce stomach upset. Avoid all alcoholic drinks, including beer, wine, and spirits, and avoid tyramine-rich foods such as aged cheese, cured meats, fermented soy products, broad bean pods, and yeast extracts while taking this medicine and for at least four days after the last dose, because a dangerous rise in blood pressure can occur. Tell your doctor about all other medicines, supplements, and herbal products you use, especially antidepressants, blood pressure medicines, diabetes medicines, and blood thinners. Do not drive or operate heavy machinery if you feel dizzy or drowsy. Keep all follow-up appointments so your doctor can check your response and watch for side effects. Store the tablets in their original container away from moisture, heat, and direct light, and keep them out of reach of children. If you are pregnant, planning pregnancy, or breastfeeding, speak to your doctor before using this medicine.
👴 Special Considerations for Elderly
💡 For Patients Above 65
Older adults are more likely to experience dizziness, low blood pressure, low blood sugar, and nerve-related side effects with this medicine. They may also take other medicines that interact with it, so a careful review of all medicines is important. Treatment should be kept as short as possible, and blood pressure, blood sugar, and symptoms of neuropathy should be monitored closely.
🤰 Pregnancy Planning (TTC)
If you are trying to conceive, tell your doctor before taking this medicine. It should be avoided in pregnancy unless a qualified clinician decides that the benefit clearly outweighs the risk, and it must not be used near term. If you become pregnant while taking it, contact your doctor immediately for advice.
🏥 Post-Surgery Considerations
Not established from the available information. If you have recently had surgery, tell your surgeon and anaesthetist about this medicine, because it can interact with other medicines and affect blood pressure and blood sugar. Do not restart it after surgery without your doctor's approval.
🦷 Dental Procedures
Tell your dentist that you are taking this medicine before any dental procedure. Because it can interact with other medicines and affect blood pressure, your dentist may need to coordinate with your doctor, especially if you need anaesthesia, antibiotics, or pain relief. Continue to avoid alcohol-containing mouthwashes and tyramine-rich foods around the time of treatment.
💚 Lifestyle Tips for Better Results
🏋️ Exercise Considerations
Avoid strenuous exercise while you are unwell with a gut infection, because dehydration and weakness can make you prone to dizziness and fainting. Light activity such as short walks is fine if you feel up to it. Do not drive or operate heavy machinery if you feel dizzy, drowsy, or weak, and return to your normal exercise routine gradually after your symptoms have settled and your doctor has confirmed it is safe.
🥗 Diet Recommendations
💼 Impact on Daily Work & Life
This medicine can cause nausea, dizziness, and tiredness, which may affect your ability to concentrate at work. Avoid driving or operating heavy machinery if you feel dizzy or drowsy. Because you must avoid alcohol and tyramine-rich foods, you may need to plan meals and social events carefully during treatment. Most people can continue light duties, but if your work involves heavy physical activity or safety-sensitive tasks, discuss temporary adjustments with your employer and doctor.
🛑 When to Stop This Medicine
Stop this medicine only when your doctor tells you the course is complete, or earlier if you develop a serious side effect such as a severe allergic reaction, a hypertensive reaction after eating tyramine-rich food or drinking alcohol, tingling or numbness in the hands and feet, yellowing of the eyes or skin, or unusual tiredness or bruising. Do not stop early just because you feel better, because the infection may not be fully cleared. If you need to stop for any reason, contact your doctor so they can review your condition and decide on the next step.
📅 Long-Term Use Effects
Long-term use of this medicine is not recommended because it increases the risk of peripheral neuropathy with tingling, numbness, or burning in the hands and feet, and it may also cause blood disorders or liver injury. Treatment should be kept as short as the infection allows, and anyone who needs repeated or prolonged courses should be reviewed by a specialist to look for a better alternative. Regular monitoring of blood counts, liver function, blood sugar, and nerve symptoms may be needed if longer treatment cannot be avoided.
🌿 Non-Medicine Approaches
These can complement medicine but do not replace prescribed treatment.
Replacing fluids and electrolytes is the cornerstone of managing diarrhoea and dehydration and should always be used alongside any antimicrobial when needed.
Evidence: Well-establishedThese may be preferred for giardiasis, cholera, or other susceptible infections depending on local resistance patterns and the person's circumstances.
Evidence: Well-established for specific indicationsZinc can reduce the duration and severity of diarrhoea in children and is recommended in many public health programmes.
Evidence: Well-established in childrenSome probiotic strains may help shorten the duration of infectious diarrhoea, but evidence is mixed and they should not replace antimicrobial treatment when it is needed.
Evidence: Limited to moderate💉 Vaccination Considerations
💉 If You're Getting Vaccinated
Not established from the available information. There is no known interaction between this medicine and routine vaccines, but if you are unwell with a fever or severe diarrhoea, your doctor may advise delaying non-urgent vaccinations until you have recovered.
📦 Storage Guide
✅ DO
Store at room temperature between 15°C and 30°C
❌ DON'T
Do not refrigerate unless the label specifically says so
✅ DO
Keep the tablets in their original labelled container
❌ DON'T
Do not transfer them to unmarked containers
✅ DO
Keep the container away from direct sunlight and moisture
❌ DON'T
Do not store in a bathroom cabinet or near a sink
✅ DO
Keep out of reach of children and pets
❌ DON'T
Do not leave loose tablets within a child's reach
✅ DO
Check the expiry date before use
❌ DON'T
Do not use expired tablets or flush them down the toilet
✈️ Traveling with This Medicine
When travelling, carry this medicine in its original labelled container along with a copy of your prescription, because customs officials may ask for proof that it is for personal medical use. Keep the tablets in your hand luggage rather than checked baggage so they are not exposed to extreme temperatures or lost. Store them away from direct sunlight and moisture, and do not leave them in a hot car. If you are crossing time zones, ask your doctor how to adjust the dosing schedule so that doses remain evenly spaced. Continue to avoid alcohol and tyramine-rich foods throughout your trip and for four days after the last dose, and identify a nearby clinic or hospital at your destination in case you develop severe symptoms.
💰 Cost Analysis & Savings
👥 Real Patient Stories
Educational, anonymized scenarios. Individual results may vary.
💬 Questions Patients Often Ask
A: The exact time to onset is not established from the available information. In practice, improvement in diarrhoea and related symptoms is usually expected within one to three days, but this depends on the infection and the person. If you do not improve or you get worse, contact your doctor.
A: No. Alcohol must be completely avoided during treatment and for at least four days after the last dose, because it can cause a dangerous reaction with flushing, severe headache, vomiting, and a sudden rise in blood pressure.
A: Avoid aged cheese, cured meats, fermented soy products, broad bean pods, yeast extracts, and any other tyramine-rich foods during treatment and for four days afterwards. These can cause a dangerous rise in blood pressure.
A: This medicine should be avoided in pregnancy unless a qualified clinician decides that the benefit clearly outweighs the risk. It must not be used near term because it may cause serious problems in the newborn.
A: Watch for a severe headache with pounding heartbeat after eating tyramine-rich food or drinking alcohol, swelling of the face or throat, difficulty breathing, yellowing of the eyes or skin, tingling or numbness in the hands and feet, unusual tiredness, or easy bruising. Seek urgent medical care if any of these occur.
A: Pediatric dosing is not established from available information. Consult a pediatrician. This medicine is not recommended for infants under one month of age.
A: Yes, a brownish or yellowish colour of the urine is a common and harmless effect. It disappears after the medicine is stopped. However, very dark urine with yellow eyes or skin needs urgent medical review.
A: If less than half the dosing interval has passed, take the missed dose as soon as you remember. If more than half has passed, skip it and continue with your regular schedule. Never double the dose.
🤔 Common Patient Concerns
🛑 Myths vs. Facts
- Myth: This medicine can be taken for any type of diarrhoea.
Fact: This medicine only works against certain bacteria and protozoa. It is not effective for viral diarrhoea, food intolerance, or inflammatory bowel disease, and it should only be used when a clinician has identified a susceptible infection. - Myth: It is safe to have a small drink of alcohol while taking this medicine.
Fact: Even small amounts of alcohol can trigger a dangerous reaction with this medicine. Alcohol must be completely avoided during treatment and for at least four days after the last dose. - Myth: This medicine is a first-choice treatment for cholera and giardiasis.
Fact: Safer and better-studied alternatives are usually preferred. This medicine is generally reserved for situations where other options are not suitable or not available. - Myth: Dark urine means the medicine is harming the kidneys.
Fact: A brownish or yellowish colour of the urine is a harmless and expected effect of this medicine. It disappears after the medicine is stopped. However, very dark urine with yellow eyes or skin needs urgent medical review.
🔄 Alternative Options
Generic Alternatives
- Furazolidone 500 mg tablet
Brand Alternatives
- Furon 500mg tablet