Tenofovir Disoproxil Fumarate
Uses of Tenofovir Disoproxil Fumarate
- Tenofovir Disoproxil Fumarate (TDF) is an antiviral medicine used to treat HIV infection and chronic hepatitis B. It works by slowing down the replication of the virus in the body.
Tenofovir Disoproxil Fumarate is commonly used for:
1. HIV-1 infection: Used as part of combination antiretroviral therapy (ART) to suppress HIV replication, reduce viral load, and help maintain immune function in adults and children.
2. Chronic hepatitis B (HBV): Helps suppress hepatitis B virus activity in the liver, reducing liver inflammation and the risk of long-term liver damage such as cirrhosis or liver cancer.
3. HIV post-exposure prophylaxis (PEP): Used after potential exposure to HIV to reduce the risk of infection, as directed by a doctor.
4. Prevention of mother-to-child HIV transmission: May be used during pregnancy or childbirth to reduce the risk of passing HIV from mother to baby, under close medical supervision.
Side effects of Tenofovir Disoproxil Fumarate
Diarrhoea
Nausea
Weakness (asthenia)
Headache
Depression
How Tenofovir Disoproxil Fumarate works
- Tenofovir Disoproxil Fumarate works by blocking a key step in the process that HIV and hepatitis B virus use to multiply inside the body.
- After being taken orally, it is converted inside the body into its active form tenofovir diphosphate. This active form closely resembles one of the natural building blocks that viruses use to copy their genetic material. When the virus tries to replicate, it incorporates tenofovir diphosphate into its DNA chain instead of the natural building block.
- This causes the viral DNA chain to terminate prematurely, meaning the virus cannot complete the copying process. As a result, viral replication is halted, the amount of virus in the body is reduced, and the progression of the infection is slowed.
- For HIV, this action helps keep the viral load low and supports the immune system. For hepatitis B, it reduces the viral activity in the liver, helping to limit liver damage over time.
Certified content
Written By
Doctor of Medicine
Reviewed By
BAMS, FMC, MD Resident
Expert Advice
Dosage Forms Available
Tenofovir Disoproxil Fumarate is available in the form of tablets and oral powder for oral administration.
The oral powder form should be mixed with soft food prior to consumption, while the tablet should be swallowed without chewing or crushing.
Age and Dose Restrictions
This medicine is intended for use by adults and children.
For children with HIV-1 infection, it is suitable from age 2 years and above.
In cases of chronic Hepatitis B infection, it is appropriate for use in children aged 12 years and above who weigh at least 35 kg.
Contraindications
Tenofovir Disoproxil Fumarate is contraindicated in patients who have demonstrated hypersensitivity to any of the components of this medicine.
Other Medications to Avoid
Tenofovir disoproxil fumarate may interact with antiretroviral medicines (e.g., didanosine), nephrotoxic medications (e.g., aminoglycosides), anticonvulsants (e.g., carbamazepine, phenytoin), antimycobacterials (e.g., rifampin) and hepatotoxic medicines (e.g., acyclovir, valacyclovir).
Overdose and Missed Dose
- An overdose of Tenofovir Disoproxil Fumarate may cause harmful effects on the kidneys and other organs. If an overdose is suspected, seek immediate medical attention or visit the nearest hospital. There is no specific antidote, and treatment will focus on supportive care based on the symptoms presented.
If you miss a dose of Tenofovir Disoproxil Fumarate, take it as soon as you remember. If it is almost time for your next scheduled dose, skip the missed dose and continue with your regular schedule. Do not take two doses at the same time to make up for a missed one. Consistent daily dosing is important for this medicine to remain effective.
Management of Side Effects
Most side effects are temporary and generally harmless and resolve when discontinuing this medicine. However, if you experience any severe side effects or worsening of any of the symptoms, please consult your doctor.
Drinking plenty of water can help manage side effects such as diarrhoea and nausea.
Taking this medication with food may help reduce gastrointestinal upset.
Use in Driving and Operating Machinery
Tenofovir Disoproxil Fumarate may cause side effects like fatigue and dizziness that may impair your ability to drive or operate machinery.
Use in Pregnancy and Lactation
Consultation with a doctor is advised before using Tenofovir Disoproxil Fumarate during pregnancy or while breastfeeding.
Caution in Other Conditions
Individuals with kidney problems should exercise caution when using Tenofovir Disoproxil Fumarate, as this medication may affect kidney function.
Special Dietary and Lifestyle Recommendations
Maintain a balanced diet rich in fruits, vegetables, whole grains, lean proteins, and low-fat dairy to support overall health.
Regular physical activity can improve general health and immunity.
Avoid smoking and limit alcohol consumption to prevent further liver damage if you have Hepatitis B.
Use barrier methods of contraception (like condoms) to prevent transmission of HIV during sexual activity.
Practice good hygiene habits, like regular hand washing, to prevent the spread of Hepatitis B.
Frequently asked questions
Does Tenofovir Disoproxil Fumarate have an impact on the immune system?
Yes, Tenofovir Disoproxil Fumarate is an antiviral medication that works by controlling the replication of HIV and Hepatitis B viruses in your body, which helps your immune system fight off these infections.
Can I take Tenofovir Disoproxil Fumarate if I am allergic to any other medicines?
If you have any known allergies to other medicines, particularly antiviral medications, you should inform your doctor before starting Tenofovir Disoproxil Fumarate.
Does Tenofovir Disoproxil Fumarate have any effect on mood or behaviour?
While Tenofovir Disoproxil Fumarate can cause some side effects like depression and insomnia, it does not typically affect your mood or behaviour directly. However, everyone reacts differently to medications, so if you notice any changes in your mood or behaviour, consult your doctor promptly.
Can Tenofovir Disoproxil Fumarate be taken alongside natural remedies and supplements?
It is important to inform your doctor about all medications, natural remedies and supplements you are taking as they could affect how Tenofovir Disoproxil Fumarate works or increase the risk of side effects.
Is Tenofovir Disoproxil Fumarate safe for long-term use?
Tenofovir Disoproxil Fumarate is typically used for long-term management of HIV and chronic hepatitis B infections. However, its safety for long-term use depends on regular monitoring by your doctor to detect and manage any potential side effects.
Can Tenofovir Disoproxil Fumarate cause weight changes?
Changes in weight are not commonly reported with Tenofovir Disoproxil Fumarate. If you notice significant weight gain or loss, it would be wise to discuss this with your doctor.
Can I consume alcohol while taking Tenofovir Disoproxil Fumarate?
While there is no specific warning about drinking alcohol while taking Tenofovir Disoproxil Fumarate, excessive alcohol consumption can increase your risk of liver damage and other health problems. It is advisable to discuss your alcohol intake with your doctor.
List of medicines for Tenofovir Disoproxil Fumarate
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