Tafsure 25mg (Tenofovir Alafenamide)

Tenofovir Alafenamide is an anti-hepaciviral & anti-retroviral medicine. In HIV infected patients, Tafsure is not used alone and it may combine with some other anti-retroviral drugs like Emtricitabine, cobicistat, or darunavir.

At first, Tafsure is belongs to anti-retroviral (nucleoside reverse transcriptase inhibitor), now Tafsure has anti-hepaciviral property which is used against hepatitis B viral infection

INDICATION

Prior usage of Tafsure tablet, used in HIV-1 infection Tafsure tablet is also indicated for the treatment of hepatitis B viral infection, by reducing the advancement of virus Tafsure used in chronic hepatitis B infection, is non-curable but it can able to prevent the viral transmission

HOW TAFSURE WORKS

Tafsure -Tenofovir Alafenamide (TAF) TAF is a prodrug of tenofovir (parent drug) At first, TAF is penetrating into hepatic cells because it has lipophilic cell permeable capacity. After enters into the cells, TAF undergoes hydrolysis by using carboxylesterase-1 and to formed as tenofovir. Tenofovir involved in intracellular metabolism, which is phosphorylated into tenofovir triphosphate. Tenofovir triphosphate is considered as an active metabolite which has anti-viral property and integrated into viral DNA by hepatitis B reverse transcriptase enzyme and leads to inhibits viral production thus results as termination of viral chain.

HOW TO TAKE TAFSURE TABLET

The usual dosage of Tafsure tablet is, one tablet containing 25mg of Tenofovir Alafenamide should be taken as a single dose Tafsure tablet should be administered with food In creatinine clearance range <15ml/min, Tafsure is not recommended In decompensated cirrhosis: Tafsure should not be recommended Before initiating the therapy: Patients should examine HIV-1 infection for recommending combination of other anti-retroviral drugs in HIV-1 positive patients.

HOW THE BODY WORKS FOR TAFSURE TABLETS

After an oral administration, absorption of Tafsure tablet occurs rapidly. The peak plasma time occurs within 0.48 hours The effect of food while taking Tafsure tablet is includes as; With high fat meal, the effect of tenofovir Alafenamide is 1.65 Tafsure is highly bound to human plasma protein nearly 80% The blood plasma ration is 1.0 Metabolism of tenofovir Alafenamide is occurs with the aid of cathepsin A, carboxylesterase-1 The half life period of tenofovir Alafenamide is 0.51 hour Excretion occurs through urine <1%; feces 31.7%

SIDE EFFECTS CAUSED DURING THERAPY

Important adverse effects; Lactic acidosis or severe hepatomegaly with steatosis Reactivation of hepatitis B viral infection in worsening condition after the therapy Renal damage occurs Some of undesirable effects; Headache Fatigue Cough Nausea Back pain Abdominal pain Reduction in bone mineral density Glycosuria Creatine kinase elevation Amylase lipase elevated

SOME DRUGS MAY INTERACT WITH TAFSURE TABLETS

Tafsure combined with P-gp or BCRP strong inhibitors, results as alteration of absorption of tenofovir Alafenamide P-gp or BCRP inducers, combined with Tafsure tablets leads to cause loss of therapeutic effect of Tafsure Tafsure with P-gp or BCRP moderate inhibitors results as absorption elevation thus causes plasma concentration of tenofovir Alafenamide Tafsure tablets combined with anti-convulsants (phenytoin, carbamazepine, or Phenobarbital), anti-mycobacterials (rifampin, rifapentine, or rifabutin) or herbal products (st Johns wort) causes depletion in effect of concentration of HepBest

WARNING & PRECAUTIONS

After cessation of anti-hepatitis B therapy by using with Tafsure tablet, concluded in serious intense aggravation of hepatitis B infection. To avoid this adverse condition in the patients, liver function should be observed frequently.

Exposure of reinforcement of HIV-1 antagonism in HBV/HIV-1 co infected patients In HIV infected patients, combinational therapy is suggested for avoiding this condition in co-infected patients. Check the HIV antibody in all HBV infected patients before starting the therapy.

New commencement and worsening of renal damage Patient with low renal function capability, stop the Tafsure tablet therapy immediately and monitored the serum phosphorus, serum creatinine, urine protein, urine glucose and creatinine clearance frequently

Lactic acidosis or serious hepatomegaly with steatosis If this condition occurred in the patients, immediately discontinue the therapy and provide safety measures

PREGNANCY & LACTATION

Tafsure is rational use, in some patients placental transformation happens In breast feeding and lactation condition, Tafsure is used only under the guidance of medical practitioner.

STORAGE 

Tafsure tablets container is stored under room temperature below 30°C Tafsure container should be kept in dry and cool place and should be free from heat, moisture Protect from light

OVER DOSAGE

In over dosage condition, two steps follows 1. Examine the deposition of toxicity and symptoms occurred due to over dosage 2. Hemodialysis, a method involved in eradicating the over dosage of Tafsure with separation coefficient of 54%

MISSED DOSE

Once missed dose occurred, patient must consult with medical practitioner and follow the instruction. On another way, missed dose should be skipped and proceed from regular dosing schedule.