Telbivudine
Telbivudine is a synthetic thymidine nucleoside analogue with activity against hepatitis B virus (HBV). Telbivudine is the unmodified β–L enantiomer of the naturally occurring nucleoside, thymidine. It undergoes phosphorylation via interaction with cellular kinases to form the active metabolite, telbivudine 5'-triphosphate.Telbivudine 5'–triphosphate inhibits HBV DNA polymerase (reverse transcriptase) by competing with the natural substrate, thymidine 5'–triphosphate. This leads to the chain termination of DNA synthesis, thereby inhibiting viral replication. Incorporation of telbivudine 5'–triphosphate into viral DNA also causes DNA chain termination, resulting in inhibition of HBV replication. Telbivudine inhibits anticompliment or second-strand DNA.
Adults and Adolescents (16 years of age and older): Due to higher rates of resistance that may develop with longer term treatment among patients with incomplete viral suppression, treatment should only be initiated, if pre-treatment HBV DNA and ALT measurements are known, in the following patient populations-For HBeAg-positive patients, HBV DNA should be less than 9 log10 copies per mL and ALT should be greater than or equal to 2x ULN prior to treatment with Telbivudine.For HBeAg-negative patients, HBV DNA should be less than 7 log10 copies per mL prior to treatment with Telbivudine.HBV DNA levels should be monitored at 24 weeks of treatment to assure complete viral suppression (HBV DNA less than 300 copies per mL). Alternate therapy should be initiated for patients who have detectable HBV DNA after 24 weeks of treatment. Optimal therapy should be guided by further resistance testing.The recommended dose of Telbivudine for the treatment of chronic hepatitis B:600 mg once daily, taken orally, with or without food. Telbivudine Oral Solution (30 mL) may be considered for patients who have difficulty with swallowing tablets.
Altered plasma concentration with drugs that affect renal function (e.g. aminoglycosides, loop diuretics, platinum compounds, vancomycin, amphotericin B). May increase risk of myopathy with other drugs associated with myopathy (e.g. azole antifungals, ciclosporin, corticosteroids, erythromycin, fibrates, HMG-CoA reductase inhibitors, penicillamine, zidovudine).
Hypersensitivity. Combination of Telbivudine with pegylated interferon alfa-2a is contraindicated because of increased risk of peripheral neuropathy
Cough, dizziness, fatigue, GI effects (e.g. abdominal pain, diarrhoea, nausea, vomiting, dyspepsia), rash, arthralgia, myalgia, myopathy, malaise, back pain, nasopharyngitis, headache, flu or flu-like symptoms, insomnia; increased serum amylase, lipase, creatine phosphokinase, alanine aminotransferase levels; peripheral neuropathy, rhabdomyolysis.
Pregnancy Category B. Telbivudine is not teratogenic and has shown no adverse effects in developing embryos and fetuses in preclinical studies. Studies in pregnant rats and rabbits showed that telbivudine crosses the placenta. Developmental toxicity studies revealed no evidence of harm to the fetus in rats and rabbits at doses up to 1000 mg per kg per day, providing exposure levels 6- and 37-times higher, respectively, than those observed with the 600 mg per day dose in humans.There are no adequate and well-controlled trials of Tyzeka in pregnant women. Because animal reproductive toxicity studies are not always predictive of human response, Tyzeka should be used during pregnancy only if potential benefits outweigh the risks.
Severe acute exacerbations of hepatitis B. Monitor hepatic function in discontinued therapy. Lactic acidosis, severe hepatomegaly with steatosis, myopathy, rhabdomyolysis, uncomplicated myalgia. Discontinue if myopathy is diagnosed. Increased risk of peripheral neuropathy when combined with pegylated interferon α-2a. Decompensated cirrhosis, renal impairment or on hemodialysis; liver transplant recipients or under immunosuppressant therapy. May impair the ability to drive or operate machinery. Pregnancy. Childn <16 yr. Elderly.
Hepatic viral infections (Hepatitis B)
Store Sebivo Tablets and Oral Solution in the original bottle at room temperature (15° to 30°C)
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