Overview
What is Tenofovir Disoproxil Fumarate?
Tenofovir DF (TDF) is a nucleotide reverse transcriptase inhibitor (NRTI) used as part of combination antiretroviral therapy (ART) to treat HIV-1 infection in adults and children. It is also approved for chronic Hepatitis B. It does not cure HIV but suppresses viral replication, reducing viral load to undetectable levels.
Mechanism
How Does It Work?
1
Cellular uptake
TDF enters HIV-infected CD4+ T cells and macrophages and is converted to its active form, tenofovir diphosphate (TFV-DP).
2
Chain termination
TFV-DP competes with the natural substrate dATP, incorporating into the viral DNA chain and causing premature termination of reverse transcription.
3
Viral suppression
Without functional reverse transcriptase, HIV cannot replicate. Consistent dosing maintains undetectable viral loads in most patients.
Dosage
How to Use
Timing
Once daily, at the same time each day
How to Take
Swallow whole with water. Can be taken with or without food.
With Food
No food restrictions; high-fat food may slightly increase absorption
Alcohol
Avoid excessive alcohol — may worsen kidney stress
Missed Dose
Take as soon as remembered. If close to next dose, skip the missed dose. Never double dose.
Safety
Side Effects & Precautions
Common Side Effects
- Nausea
- Diarrhoea
- Headache
- Dizziness
- Fatigue
Serious Side Effects — seek help immediately
- Lactic acidosis (rare but serious)
- Kidney impairment — monitor renal function
- Decreased bone density with long-term use
- Severe hepatomegaly with steatosis
Who Should Not Take This
- Severe renal impairment (CrCl <30 mL/min) without dose adjustment
- Known hypersensitivity to tenofovir
Value
Generic vs Brand
Generic (OnlineMeds)
Viread
Price per unit
$40.00
$600–$900/month
Active ingredient
Identical
Identical
Storage
Storage & Handling
Temperature
Below 25°C (77°F)
Light
Keep in original container, away from light
Humidity
Store in a dry place
Travel
Keep in carry-on luggage with original prescription packaging
Children
Keep out of reach of children.
Why OnlineMeds
Why Buy From Us
Manufacturer Direct
Sourced directly from WHO-GMP certified manufacturers.
Quality Verified
Every batch tested for purity and bioequivalence.
Global Delivery
Discreet shipping to UK, US, AU, EU and beyond.
Licensed Pharmacy
Regulated and compliant with international pharmacy standards.
FAQ
Frequently Asked Questions
Can I take Tenvir EM Tablets if I have kidney disease?
Tenofovir can affect kidney function. Patients with existing kidney disease require dose adjustment or an alternative regimen. Your doctor will monitor your renal function regularly.
Does Tenofovir Disoproxil Fumarate cure HIV?
No. Tenofovir suppresses viral replication but does not eliminate HIV from the body. Consistent daily dosing is essential to maintain undetectable viral load and prevent transmission.
What happens if I miss a dose of Tenvir EM Tablets?
Take it as soon as you remember. If it is almost time for the next dose, skip the missed dose and continue your regular schedule. Do not double up.
Can I take Tenvir EM Tablets during pregnancy?
TDF is one of the preferred antiretrovirals in pregnancy per WHO guidelines. Discuss your full treatment plan with your HIV specialist.
How long does it take for Tenofovir Disoproxil Fumarate to work?
Most patients see viral load decline within 4 weeks. Undetectable levels are typically achieved within 3–6 months when taken consistently as part of combination ART.
⚠ BLACK BOX WARNING
Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with nucleoside analogues.
Severe acute exacerbations of Hepatitis B have been reported in HBV-infected patients who discontinue TDF.
Drug Interactions
| Drug / Substance | Effect | Action |
|---|
| Didanosine (ddI) |
Increased ddI exposure — risk of pancreatitis |
Avoid combination |
| Atazanavir |
TDF increases atazanavir exposure |
Boost with ritonavir; monitor |
| NSAIDs / nephrotoxic drugs |
Additive renal toxicity |
Monitor renal function closely |
Approved Indications
-
HIV-1 infection (adults and paediatrics ≥2 years) FDA / EMA
-
Chronic Hepatitis B in adults FDA / EMA
-
Pre-exposure prophylaxis (PrEP) for HIV-1 FDA
References
-
Gilead Sciences. Viread (tenofovir disoproxil fumarate) prescribing information. ↗
-
WHO. Consolidated guidelines on HIV prevention, testing, treatment, service delivery and monitoring. ↗
Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication. Used as prescribed by a licensed medical professional.
