Hepbest 25 mg Tenofovir alafenamide (TAF), a targeted antiviral prodrug. It is primarily used to treat chronic Hepatitis B virus (HBV) infection. TAF delivers the active antiviral medication more efficiently to the liver than older drugs, effectively suppressing viral replication while minimizing adverse effects on the kidneys and bones.
Mechanism of Action (Pharmacodynamics)
Prodrug Activation: TAF is a phosphonamidate prodrug of tenofovir. It enters hepatocytes via passive diffusion and specific hepatic transporters.
Active Form: Inside the liver cells, it is converted into tenofovir and subsequently phosphorylated into the active metabolite, tenofovir diphosphate.
Viral Inhibition: This active metabolite competes with natural nucleotides and gets incorporated into the viral DNA via the HBV reverse transcriptase enzyme, leading to DNA chain termination and halted viral replication.
Pharmacokinetics (ADME):
Absorption: It is rapidly absorbed and reaches peak plasma concentrations typically within 1 to 2 hours post-dose. It is best absorbed when taken with a meal.
Metabolism: Primarily hydrolyzed to tenofovir in hepatocytes by carboxylesterase 1. It undergoes minimal metabolism via the Cytochrome P450 (CYP) enzyme system, reducing the risk of drug interactions.
Distribution: It has a high binding rate to human plasma proteins.
Excretion: The drug is primarily excreted via the kidneys. The inactive metabolites are excreted in the urine, while unchanged tenofovir is eliminated via glomerular filtration and active tubular secretion.
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Regulatory documents (COA, MSDS, etc.)
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