Description
Comprehensive Guide to Tavin 300mg Tablet (Tenofovir Disoproxil Fumarate)
Tavin 300mg Tablet is an antiviral prescription medication manufactured by Emcure Pharmaceuticals Ltd. Each film-coated tablet contains a single active ingredient:
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Tenofovir Disoproxil Fumarate (TDF): 300 mg (equivalent to 245 mg of tenofovir disoproxil)
Tavin is an oral prodrug classified as a nucleotide reverse transcriptase inhibitor (NtRTI). It is prescribed under specialist medical supervision for two main indications: managing Human Immunodeficiency Virus Type 1 (HIV-1) infection in combination with other antiretrovirals, and treating Chronic Hepatitis B Virus (HBV) infection.
Quick Product Fact Sheet
| Feature | Details |
| Brand Name | Tavin Tablet |
| Active Ingredient | Tenofovir Disoproxil Fumarate (300 mg) |
| Manufacturer | Emcure Pharmaceuticals Ltd. |
| Therapeutic Class | Antiviral agent |
| Pharmacological Class | Nucleotide Reverse Transcriptase Inhibitor (NtRTI) |
| Dosage Form | Film-coated oral tablet |
| Standard Adult Dose | One 300mg tablet taken orally once daily |
| Primary Uses | HIV-1 infection (in combination) and Chronic Hepatitis B |
How Tavin 300mg Works
Tenofovir disoproxil fumarate is an oral medication that converts inside the body into its active form: tenofovir diphosphate.
Mechanism in HIV-1 Infection
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Tenofovir diphosphate competes with natural cellular building blocks for incorporation into growing viral DNA by the HIV-1 reverse transcriptase enzyme.
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Because tenofovir lacks the required chemical link (a 3′-hydroxyl group), its incorporation causes immediate viral DNA chain termination.
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This stops the virus from multiplying and prevents it from integrating into human immune cell genetic material.
Mechanism in Chronic Hepatitis B (HBV)
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Tenofovir diphosphate directly inhibits the HBV DNA polymerase enzyme.
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By blocking this enzyme and stopping DNA chain growth, it halts viral replication inside liver cells. This lowers the viral load, reduces liver inflammation, and decreases long-term risks of cirrhosis and liver cancer.
Approved Clinical Indications
Tavin 300mg Tablet is indicated for adult and adolescent patients (12 years of age and older, weighing 35 kg or more) in the following settings:
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Treatment of HIV-1 Infection: Used as a foundational component of combination antiretroviral therapy (cART). It must always be taken in combination with at least two other antiretroviral medicines to suppress the virus and prevent drug resistance.
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Treatment of Chronic Hepatitis B Virus (HBV): Indicated as a single daily medicine (monotherapy) for chronic hepatitis B in adults and adolescents (12 years of age and older, weighing 35 kg or more) with compensated or decompensated liver disease, evidence of active viral multiplication, and elevated liver enzymes or active liver tissue inflammation.
Standard Dosage and Administration Guidelines
Tavin must be taken strictly as prescribed by your doctor.
Standard Dosage
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Standard Dose: One 300mg tablet taken orally once daily.
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Food Considerations: Can be taken with or without food. Taking it with a meal may slightly improve absorption and reduce mild stomach upset.
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How to Take: Swallow the tablet whole with a glass of water. Do not crush, chew, split, or dissolve the tablet.
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Daily Timing: Take your tablet at the exact same time every day to maintain steady blood levels.
Dose Adjustments for Kidney Impairment
Because tenofovir is cleared mainly through the kidneys, dosing intervals must be adjusted if baseline kidney filtration is reduced:
| Creatinine Clearance (CrCl) | Recommended Dosing Schedule |
| 50 mL/min or higher | One 300mg tablet every 24 hours (standard daily dose) |
| 30 to 49 mL/min | One 300mg tablet every 48 hours |
| 10 to 29 mL/min | One 300mg tablet every 72 to 96 hours |
| Hemodialysis Patients | One 300mg tablet every 7 days (taken immediately after dialysis) |
Missed Dose Instructions
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If you miss a dose by less than 12 hours, take it immediately and continue your normal schedule.
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If you are more than 12 hours late, skip the missed dose and resume your regular timing the next day.
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Never take a double dose to make up for a missed tablet.
Potential Side Effects & Clinical Management
Most patients tolerate Tavin well. Mild symptoms often occur during the first few weeks of therapy and resolve over time.
Common Side Effects
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Digestive: Mild nausea, diarrhea, stomach pain, gas, or vomiting.
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Nervous System: Headache, dizziness, fatigue, or trouble sleeping.
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Skin: Mild skin rash or itching.
Serious Adverse Reactions (Require Immediate Medical Attention)
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Severe Hepatitis B Flare-up (Black Box Warning): In patients with Hepatitis B, stopping Tavin abruptly can trigger severe, life-threatening inflammation of the liver. Liver function must be watched closely for several months if treatment is stopped.
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Kidney Problems (Renal Toxicity): Tenofovir can affect kidney tubules, leading to elevated creatinine, protein in the urine, low blood phosphorus, and kidney damage.
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Bone Mineral Density Loss: Long-term use can reduce bone density, increasing the risk of thinning bones (osteopenia, osteoporosis) or fractures.
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Lactic Acidosis: A rare buildup of acid in the blood causing persistent muscle aches, rapid breathing, severe stomach pain, cold hands and feet, and extreme weakness.
Precautions & Routine Safety Monitoring
| Test / Evaluation | Recommended Frequency | Purpose |
| Kidney Function (eGFR, CrCl, Phosphorus) | Baseline, then every 3 to 6 months | Monitors kidney filtration and checks for early kidney tubule stress. |
| Urine Tests (Protein and Sugar) | Baseline, then periodic checks | Checks for protein or sugar leakage linked to kidney changes. |
| HIV and Hepatitis B Screening | Baseline before starting | Verifies co-infection status so HIV is never accidentally treated with Tavin alone. |
| Liver Function Tests (ALT, AST, Bilirubin) | Baseline, then periodic checks | Tracks liver health and monitors for sudden flare-ups if stopped. |
| Bone Density Scan (DEXA) | Baseline and periodic (in high-risk patients) | Evaluates bone strength in patients with a history of bone fractures. |
Drug Interactions & Warnings
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Kidney-Stressing Drugs: Avoid taking Tavin with other medicines that can harm the kidneys, such as high-dose pain relievers (NSAIDs like ibuprofen or naproxen), aminoglycoside antibiotics, and vancomycin.
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Hepatitis C Antivirals (Ledipasvir/Sofosbuvir, Velpatasvir/Sofosbuvir): These medicines can raise tenofovir levels in the blood, increasing kidney risks. More frequent kidney tests are recommended.
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Didanosine: Combining with didanosine is not recommended because tenofovir significantly raises didanosine levels, increasing the risk of nerve damage and pancreas inflammation.
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Other Tenofovir Products: Do not take Tavin with other medicines containing tenofovir disoproxil or tenofovir alafenamide.
Special Population Guidance
| Population | Clinical Advice |
| Pregnancy | Safe to use when prescribed by a specialist. Large studies show no increased risk of major birth defects. Frequently used in pregnancy to prevent Hepatitis B transmission to the newborn. |
| Breastfeeding | Tenofovir passes into breast milk in small amounts. For mothers with HIV, bottle feeding is recommended where clean water and formula are available. For mothers with Hepatitis B, breastfeeding is acceptable once the baby receives the Hepatitis B vaccine and immunoglobulin at birth. |
| Kidney Disease | Dose schedule must be adjusted if creatinine clearance is below 50 mL/min. |
| Pediatric Use | Approved for adolescents aged 12 years and older who weigh at least 35 kg (77 lbs). |
Storage and Handling Protocols
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Store tablets at room temperature between 20°C and 25°C (68°F to 77°F).
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Keep in the original container, tightly closed, with the moisture-absorbing packet inside to protect against humidity.
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Keep strictly out of reach of children and pets.
Frequently Asked Questions (FAQs)
Q1: Can Tavin 300mg be used by itself to treat HIV?
No. Tavin contains only tenofovir and must never be used alone to treat HIV. It must always be combined with other anti-HIV medicines from different classes to prevent the virus from mutating and becoming resistant.
Q2: Can Tavin 300mg be used by itself to treat Hepatitis B?
Yes. For chronic Hepatitis B, Tavin is approved and routinely used as a single daily tablet (monotherapy) to keep the virus suppressed and protect the liver.
Q3: What happens if I stop taking Tavin for Hepatitis B?
Never stop taking Tavin without your doctor’s explicit advice. Stopping suddenly can cause the Hepatitis B virus to rebound quickly, leading to severe liver inflammation and potentially life-threatening liver failure.
Q4: Will Tavin weaken my bones or kidneys?
Tenofovir is filtered through the kidneys and can cause mild decreases in bone density or kidney function over long periods. Your doctor will order regular blood and urine tests to monitor your kidney and bone health during treatment.
Medical Disclaimer
This clinical guide is strictly for educational and informational purposes and should not replace professional medical advice, diagnosis, or treatment. Always consult a qualified physician, hepatologist, or infectious disease specialist before starting, stopping, or adjusting any antiviral medication.
References
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U.S. Food and Drug Administration (FDA):Viread (tenofovir disoproxil fumarate) Full Prescribing Information.
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National Center for Biotechnology Information (NCBI):StatPearls Review: Tenofovir Pharmacology, Indications, and Renal Safety.
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World Health Organization (WHO):Guidelines for the Prevention, Care, and Treatment of Persons with Chronic Hepatitis B Infection.
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MedlinePlus (National Library of Medicine):Tenofovir Disoproxil Fumarate Monograph.
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