isorif p 100mg/50mg tablet - Rifampicin (100mg) + Isoniazid (50mg) medicine

Antibin Kid 100 mg/50 mg Tablet: Complete Information

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🏭 Dynamic Laboratories Pvt Ltd 📦 Varies by brand 💊 Allopathy 📅 Updated: Sep 26, 2026
⚠️ Hepatotoxicity Risk ⚠️ Nephrotoxicity Risk 📋 Prescription Required 💊 Generic Available
Medically Reviewed
11 min read
Evidence: Well-established for the treatment of pediatric tuberculosis.
Reviewed by
SaathiMed Expert Panel | Sep 26, 2026
🩺
Medically Fact-Checked & Clinically Verified by SaathiMed Clinical Review Board
Clinical Reference Standards: CDSCO (Central Drugs Standard Control Organisation), Indian Pharmacopoeia (IP) & WHO | Last Updated: September 2026

When to Call Your Doctor IMMEDIATELY

  • Yellowing of eyes or skin (jaundice)
  • Dark urine or pale stools
  • Severe abdominal pain
  • Persistent vomiting
  • Unusual bleeding or bruising
  • Severe headache with confusion
  • Shortness of breath or difficulty breathing
  • Swelling of face, lips, or throat
  • Decreased urine output
  • Seizures

If experiencing severe symptoms, call emergency services immediately.

What is isorif p 100mg/50mg tablet used for?

This medicine is a combination of rifampicin and isoniazid used to treat tuberculosis in children. It works by killing the bacteria that cause tuberculosis. It must be taken exactly as prescribed, usually once daily, for several months.

  • Generic Name: Rifampicin (100mg) + Isoniazid (50mg)
  • Manufacturer: Dynamic Laboratories Pvt Ltd
  • Form: Allopathy
  • Pregnancy Category: Consult doctor
  • Prescription Required: Yes

🇮🇳 isorif p 100mg/50mg tablet के बारे में (Hindi Summary)

उपयोग: यह दवा बच्चों में तपेदिक (टीबी) के इलाज के लिए इस्तेमाल की जाती है। इसमें रिफैम्पिसिन और आइसोनियाजिड दो दवाएं शामिल हैं जो टीबी के बैक्टीरिया को मारती हैं। यह दवा अकेले नहीं दी जाती, बल्कि डॉक्टर द्वारा बताए गए अन्य टीबी की दवाओं के साथ दी जाती है। इसे रोजाना एक बार लेना होता है और इलाज का पूरा कोर्स करना बहुत जरूरी है।

साइड इफेक्ट्स: आम दुष्प्रभावों में जी मिचलाना, उल्टी, पेट दर्द, भूख न लगना और पेशाब, पसीना, आंसू का नारंगी-लाल रंग होना शामिल है। यह रंग बदलना हानिकारक नहीं है और दवा बंद करने पर ठीक हो जाता है। गंभीर दुष्प्रभावों में लिवर की सूजन, एलर्जी, खून की बीमारी और किडनी की समस्या हो सकती है। अगर आंख या त्वचा पीली पड़े, गहरे रंग का पेशाब आए, या बहुत थकान लगे तो तुरंत डॉक्टर से मिलें।

सुरक्षा सलाह: यह दवा सिर्फ डॉक्टर की देखरेख में ही लें। इलाज से पहले और दौरान लिवर की जांच कराना जरूरी है। शराब बिल्कुल न लें। बच्चे को कोई और दवा देने से पहले डॉक्टर को बताएं। दवा की खुराक न छोड़ें और इलाज बीच में न रोकें, वरना टीबी दोबारा हो सकती है और दवा काम नहीं करेगी। दवा को ठंडी, सूखी जगह पर रखें और बच्चों की पहुंच से दूर रखें।

💡 Did You Know? The Indian pharmaceutical market is expected to reach $130 billion by 2030.

💊 isorif p 100mg/50mg tablet Uses & Benefits

[{"condition":"Active tuberculosis in children","description":"Used as part of a combination regimen to treat active tuberculosis caused by Mycobacterium tuberculosis.","evidence":"Well-established"},{"condition":"Prevention of tuberculosis in children exposed to infected individuals","description":"Sometimes used as preventive therapy in children who have been in close contact with a person with active tuberculosis.","evidence":"Well-established"}]

Off-label uses: [{"condition":"Atypical mycobacterial infections","description":"Rarely used in combination with other drugs for certain atypical mycobacterial infections in children, but not a standard first-line option.","evidence":"Limited"}]

Primary treatment for: Tuberculosis

Also treats: Latent tuberculosis infection, Mycobacterial infections

📋 Drug Information

Generic Name(s)Rifampicin (100mg) + Isoniazid (50mg)
Brand Nameisorif p 100mg/50mg tablet
ManufacturerDynamic Laboratories Pvt Ltd
Packaging / FormVaries by brand (Allopathy)
Therapeutic ClassANTI INFECTIVES
Action Class
Route of AdministrationOral
StorageStore below 30°C in a dry place, protected from light. Keep out of reach of children.
Shelf Life24 months from the date of manufacture.
WHO GuidelineThe World Health Organization recommends rifampicin and isoniazid as part of standard antitubercular therapy for children, with doses based on weight. This fixed-dose combination is included in WHO essential medicines list for children.
ICMR GuidelineThe Indian Council of Medical Research recommends weight-based dosing of rifampicin and isoniazid for pediatric tuberculosis, with regular monitoring for adverse effects.

👨‍⚕️ Doctor's Practical Tips

Evidence-based practical advice from experienced clinicians

1
Always prescribe this medicine as part of a complete antitubercular regimen, never as monotherapy.
2
Monitor liver function tests at baseline and regularly during treatment.
3
Consider pyridoxine (vitamin B6) supplementation to prevent isoniazid-induced peripheral neuropathy.
4
Warn parents about orange-red discoloration of body fluids and reassure them it is harmless.
5
Advise strict avoidance of alcohol and other hepatotoxic drugs.
6
Educate parents on the importance of adherence and completing the full course.
7
Screen for drug interactions, especially with antiretrovirals and anticonvulsants.

🔍 Is This Medicine Right for Your Symptom?

Educational reference. Always consult a doctor for diagnosis.

✅
Persistent cough for more than 2 weeks
This medicine is commonly prescribed for tuberculosis which presents with chronic cough.
Likely Use
✅
Fever
Tuberculosis can cause low-grade fever; this medicine treats the underlying infection.
Likely Use
❌
Common cold
This medicine is not effective against viral infections like the common cold.
Not Primary

🔬 How This Medicine Works (Pharmacology)

Pharmacokinetics

AbsorptionRifampicin is well absorbed from the gastrointestinal tract, with peak plasma concentrations occurring 2-4 hours after oral administration. Isoniazid is also rapidly absorbed, with peak levels within 1-2 hours. Food may slightly reduce absorption of rifampicin, so it is often recommended to take on an empty stomach if possible.
DistributionRifampicin is highly lipophilic and distributes widely into body tissues and fluids, including cerebrospinal fluid when meninges are inflamed. Isoniazid also distributes widely, including into cerebrospinal fluid and caseous material.
Protein BindingRifampicin is about 80% protein-bound; isoniazid is about 10-15% protein-bound.
MetabolismRifampicin is metabolized in the liver, primarily by deacetylation, and undergoes enterohepatic circulation. Isoniazid is metabolized in the liver by acetylation, with genetic variability in acetylation rate (fast and slow acetylators).
Half-LifeRifampicin half-life is approximately 3-4 hours; isoniazid half-life is 1-4 hours depending on acetylator status.
ExcretionRifampicin is excreted mainly in bile and urine. Isoniazid is excreted primarily in urine as unchanged drug and metabolites.
BioavailabilityRifampicin bioavailability is about 90-95% when taken on an empty stomach; isoniazid bioavailability is approximately 80-90%.
Onset of ActionAntibacterial effects begin within hours, but clinical improvement in tuberculosis may take weeks.
Peak Plasma TimeRifampicin: 2-4 hours; Isoniazid: 1-2 hours.
Duration of ActionThe antibacterial effect persists for 24 hours, allowing once-daily dosing.

How It Works

This medicine combines two antitubercular drugs with distinct mechanisms. Rifampicin inhibits bacterial DNA-dependent RNA polymerase, preventing RNA synthesis and thus protein production. Isoniazid is a prodrug activated by bacterial catalase-peroxidase; it inhibits mycolic acid synthesis, disrupting the bacterial cell wall. Together, they are bactericidal against Mycobacterium tuberculosis.

Mechanism Steps

1
Rifampicin inhibits RNA synthesis: Rifampicin binds to the beta subunit of bacterial DNA-dependent RNA polymerase, blocking the elongation of RNA chains and preventing protein synthesis.
2
Isoniazid inhibits cell wall synthesis: Isoniazid is activated by bacterial catalase-peroxidase and then inhibits InhA, leading to disruption of mycolic acid synthesis and cell death.
3
Synergistic bactericidal action: The two drugs act on different targets, resulting in enhanced killing of Mycobacterium tuberculosis and reducing the likelihood of resistance.

💡 How to Take isorif p 100mg/50mg tablet

Strength: Tablet containing rifampicin 100 mg and isoniazid 50 mg.

1Take this medicine exactly as prescribed by the doctor.
2Swallow the tablet whole with a glass of water.
3It is best taken on an empty stomach, 1 hour before or 2 hours after meals, but if it causes stomach upset, take with food.
4Take at the same time each day to maintain consistent blood levels.
5Do not crush or chew the tablet unless instructed by the doctor.
6Complete the full course of treatment even if the child feels better.

Dosage Information

Adult DosageThis pediatric formulation is not intended for adults. Adult dosing of rifampicin and isoniazid is different and must be individualized by a qualified clinician based on indication, age, weight, renal and hepatic function. Typically, adults receive higher strengths.
Pediatric DosageThe dosage is based on body weight and must be prescribed by a pediatrician or tuberculosis specialist. This fixed-dose combination is designed for children and is usually given once daily. The exact dose depends on the child's weight and the treatment phase. Do not adjust the dose without medical advice.
Elderly DosageThis pediatric formulation is not intended for elderly patients. Elderly patients should receive adult formulations with doses adjusted based on renal and hepatic function.
Renal ImpairmentDose adjustment may be needed in severe renal impairment. Consult a doctor for individualized dosing.
Hepatic ImpairmentUse with extreme caution in patients with liver disease. Dose reduction or alternative regimens may be necessary. Regular monitoring of liver function is mandatory.
Maximum Daily DoseThe maximum daily dose is determined by the prescribing doctor based on the child's weight and clinical response. Do not exceed the prescribed dose.

Dosage Timeline

🌅 Morning ❌ ☀️ Afternoon ❌ 🌆 Evening ❌ 🌙 Night ❌

🍽️ Food Timing Guide

With food
Take with meals if stomach upset occurs
Reduces gastrointestinal irritation.
High-fat meals
Avoid taking with high-fat meals
May reduce absorption of rifampicin.
Tyramine-rich foods
Consume with caution
Isoniazid may interact with tyramine, causing hypertensive crisis.

⏰ What to Do If You Miss a Dose

📌 Less than half the dosing interval has passed
→ Take the missed dose as soon as you remember.
💡 Continue with the regular schedule.
📌 More than half the dosing interval has passed
→ Skip the missed dose.
💡 Do not double dose to catch up.

⚠️ Side Effects of isorif p 100mg/50mg tablet

✅ Common Side Effects

Orange-red discoloration of body fluids (Very common (>10%))
This is harmless and expected. It will resolve after stopping the medicine. Avoid wearing contact lenses as they may stain permanently.
Nausea and vomiting (Common (5-10%))
Take with food if tolerated. If vomiting persists, consult the doctor.
Stomach pain (Common (5-10%))
Take with meals. If severe, contact the doctor.
Loss of appetite (Common (5-10%))
Encourage small, frequent meals. Consult a dietitian if weight loss occurs.
Numbness or tingling in hands and feet (Uncommon (1-5%))
Report to the doctor; vitamin B6 supplementation may be needed.

🚨 Serious Side Effects

Hepatitis (liver inflammation) (Uncommon (1-5%))
Seek immediate medical attention if you notice yellowing of eyes or skin, dark urine, or severe fatigue.
Severe allergic reaction (anaphylaxis) (Rare (<0.1%))
Call emergency services if you experience difficulty breathing, swelling of face or throat, or severe rash.
Blood disorders (e.g., thrombocytopenia, leukopenia) (Rare (<0.1%))
Report unusual bleeding or bruising, or signs of infection. Blood tests may be needed.
Kidney problems (interstitial nephritis) (Rare (<0.1%))
Report decreased urine output or swelling. Immediate medical evaluation required.
Severe skin reactions (Stevens-Johnson syndrome) (Very rare (<0.01%))
Seek emergency care if you develop a painful rash with blisters or peeling skin.

⚠️ Rare Side Effects

Psychosis or seizures
Seek immediate medical attention if mental status changes or seizures occur.
Optic neuritis
Report vision changes immediately.
Pancreatitis
Seek care for severe abdominal pain radiating to the back.

Consult your doctor if you experience any unusual symptoms.

🔬 Drug Interactions

Drug Severity Effect
Warfarin Major
Protease inhibitors Major
Oral contraceptives Major
Phenytoin Moderate
Ketoconazole Major
Carbamazepine Moderate
Fluconazole Moderate
Antacids Minor
Paracetamol Minor
Isoniazid Moderate

🚨 Major Interactions

  • Protease inhibitors (e.g., ritonavir, lopinavir)
  • Warfarin
  • Oral contraceptives
  • Ketoconazole

⚡ Moderate Interactions

  • Phenytoin
  • Carbamazepine
  • Fluconazole

🍷 Alcohol Interaction

Alcohol should be strictly avoided while taking this medicine because both rifampicin and isoniazid can cause liver damage, and alcohol increases this risk significantly. Alcohol may also reduce the effectiveness of the treatment and worsen side effects.

🔎 Check Your Other Medicines

Educational tool. Always confirm with your doctor or pharmacist.

🛡️ Safety & Warnings

🚫 Contraindications

["Known hypersensitivity to rifampicin or isoniazid","Severe liver disease (e.g., cirrhosis with decompensation)","Acute hepatitis","Concurrent use with certain protease inhibitors (e.g., saquinavir/ritonavir)","History of drug-induced hepatitis"]

⚠️ Warnings & Precautions

["Monitor liver function closely; discontinue if signs of hepatitis occur.","Warn patients about orange-red discoloration of body fluids.","Use with caution in patients with pre-existing liver disease or alcohol use.","May reduce effectiveness of oral contraceptives; advise alternative contraception.","Isoniazid may cause peripheral neuropathy; consider pyridoxine supplementation.","Rifampicin may cause flu-like syndrome with intermittent dosing.","Avoid in patients with porphyria."]

🤱 Lactation Safety

Rifampicin and isoniazid are excreted in breast milk. Breastfeeding is generally considered safe while on this medicine, but consult a doctor to monitor the infant for potential side effects.

💊 Overdose Management

Overdose can cause nausea, vomiting, abdominal pain, liver damage, and in severe cases, seizures and coma. Seek immediate medical attention. Treatment is supportive and symptomatic. Activated charcoal may be given if within 1-2 hours of ingestion. Monitor liver and kidney function closely.

⏰ Missed Dose

If a dose is missed, take it as soon as remembered if less than half the dosing interval has passed. If more than half the interval has passed, skip the missed dose and continue with the regular schedule. Do not double dose.

Additional Safety Advice

General Safety

This medicine must only be taken under the supervision of a doctor experienced in treating tuberculosis. Regular blood tests to check liver function are essential before and during treatment. Avoid alcohol completely, as it increases the risk of liver damage. Inform your doctor if the child has any liver or kidney problems, or if they are taking any other medicines, especially anticonvulsants or blood thinners. Do not skip doses or stop treatment early, even if the child feels better, as this can lead to treatment failure and drug resistance. Keep all appointments for monitoring. If a dose is missed, follow the missed dose instructions provided by your doctor. Store the tablets in a cool, dry place away from direct sunlight and out of reach of children.

👴 Special Considerations for Elderly

💡 For Patients Above 65

This pediatric formulation is not intended for elderly patients. Elderly patients should receive adult formulations with doses adjusted based on renal and hepatic function.

🤰 Pregnancy Planning (TTC)

This medicine is for pediatric use. For women planning pregnancy, consult a doctor for appropriate tuberculosis management.

🏥 Post-Surgery Considerations

If surgery is planned, inform the surgical team about this medicine. It may interact with anesthetics and other medications used during surgery.

🦷 Dental Procedures

Inform the dentist about this medicine before any dental procedure. It may interact with certain antibiotics and anesthetics.

💚 Lifestyle Tips for Better Results

🏃
Ensure the child gets plenty of rest.
🥗
Provide a nutritious, balanced diet to support recovery.
😴
Keep the child away from people with active infections.
💧
Encourage regular follow-up appointments.
🧘
Maintain good hygiene to prevent other infections.
🌞
Ensure the child completes the full course of treatment.

🏋️ Exercise Considerations

Children on this medicine can engage in normal physical activities as tolerated. However, if they experience fatigue or dizziness, they should avoid strenuous exercise. Consult a doctor before starting any new exercise regimen.

🥗 Diet Recommendations

Include protein-rich foods like eggs, milk, and legumes.
Provide plenty of fruits and vegetables for vitamins and minerals.
Ensure adequate hydration.
Avoid high-fat and spicy foods if stomach upset occurs.
Limit tyramine-rich foods like aged cheese and cured meats.

💼 Impact on Daily Work & Life

This medicine may cause dizziness or fatigue in some children, which can affect school performance. Parents should inform teachers about the child's condition and treatment. The child can usually attend school once they are no longer contagious, which is typically after a few weeks of treatment.

🛑 When to Stop This Medicine

Do not stop this medicine without consulting the doctor. Stopping early can lead to treatment failure and drug resistance. The doctor will determine when to stop based on clinical response and test results.

📅 Long-Term Use Effects

Long-term use of this medicine is generally safe when monitored appropriately. However, prolonged use can increase the risk of liver toxicity, peripheral neuropathy, and drug interactions. Regular monitoring of liver function and clinical assessment are necessary. The duration of treatment is determined by the doctor based on the type and severity of tuberculosis.

🌿 Non-Medicine Approaches

These can complement medicine but do not replace prescribed treatment.

Nutritional support

A healthy diet can help support the immune system during tuberculosis treatment.

Evidence: Well-established
Directly Observed Therapy (DOT)

Supervision of medication intake by a healthcare worker improves adherence and outcomes.

Evidence: Well-established

💉 Vaccination Considerations

💉 If You're Getting Vaccinated

Live vaccines should be avoided during tuberculosis treatment as the immune response may be altered. Inactivated vaccines are generally safe. Consult a doctor for vaccination scheduling.

📦 Storage Guide

✅ DO

Store at room temperature (15-30°C)

❌ DON'T

Do not refrigerate unless specified

✅ DO

Keep in original container

❌ DON'T

Do not transfer to unmarked containers

✅ DO

Keep away from direct sunlight

❌ DON'T

Do not store in bathroom cabinet

✈️ Traveling with This Medicine

When traveling, carry this medicine in its original packaging along with a copy of the prescription. Keep it in hand luggage to avoid loss. Store at room temperature and protect from extreme heat. If crossing time zones, adjust dosing times gradually under medical advice. Check customs regulations for carrying prescription medicines. Always carry enough supply for the entire trip.

💰 Cost Analysis & Savings

👥 Real Patient Stories

Educational, anonymized scenarios. Individual results may vary.

👤 A 5-year-old child diagnosed with pulmonary tuberculosis
The child was started on this medicine along with other antitubercular drugs. The parents were initially worried about the orange discoloration of urine, but the doctor reassured them. After 2 months, the child's cough and fever improved significantly. The parents ensured regular follow-up and the child completed the full course successfully.
💡 Lesson: Adherence to the full treatment course and regular monitoring are key to curing tuberculosis and preventing resistance.
👤 A 3-year-old child with tuberculosis contact history
The child was prescribed this medicine as preventive therapy after close contact with a family member with active tuberculosis. The parents were educated about the importance of completing the therapy. The child experienced mild stomach upset, which was managed by giving the medicine with food. The child remained healthy and did not develop tuberculosis.
💡 Lesson: Preventive therapy with this medicine can protect children from developing active tuberculosis.

💬 Questions Patients Often Ask

Q: How long does it take to work?

A: Improvement in symptoms may be seen within a few weeks, but the full course must be completed to cure the infection.

Q: Can this medicine be taken with other medicines?

A: It can interact with many medicines. Always inform the doctor about all medicines your child is taking.

Q: What should I do if my child vomits after taking the medicine?

A: If vomiting occurs within 30 minutes of taking the dose, consult the doctor for advice on whether to repeat the dose.

🤔 Common Patient Concerns

💭 These are the concerns patients most commonly raise

  • Can this medicine be taken long-term?
  • Will it affect my child's liver?
  • Can my child go to school while taking this medicine?
  • Does it interact with other medicines?
  • What if I miss a dose?
  • Can my child take this medicine with food?

🔄 Substitutes for isorif p 100mg/50mg tablet

View All

Alternative brands with exact same active ingredient:

Medical Note: Always consult your doctor before switching medications.

🛑 Myths vs. Facts

  • Myth: Tuberculosis treatment can be stopped once symptoms improve.
    Fact: Treatment must be completed for the full duration to prevent relapse and drug resistance.
  • Myth: This medicine causes permanent orange discoloration of body fluids.
    Fact: The discoloration is temporary and harmless; it resolves after stopping the medicine.
  • Myth: Children with tuberculosis should be isolated from others.
    Fact: With proper treatment, children are usually not contagious after a few weeks and can attend school.

🔄 Alternative Options

Generic Alternatives

  • Rifampicin and isoniazid fixed-dose combination tablets are available from various generic manufacturers.

Brand Alternatives

  • Not applicable as this is a generic product.

📊 Comparison with Similar Medicines

[{"medicine":"This medicine","composition":"Rifampicin 100 mg + Isoniazid 50 mg","use":"Pediatric tuberculosis","notes":"Two-drug combination"},{"medicine":"Rifampicin + Isoniazid + Pyrazinamide","composition":"Rifampicin 100 mg + Isoniazid 50 mg + Pyrazinamide 150 mg","use":"Pediatric tuberculosis intensive phase","notes":"Three-drug combination"}]

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