Tenofovir Alafenamide is an anti-hepaciviral & anti-retroviral medicine. In HIV infected patients, Tafnat is not used alone and it may combine with some other anti-retroviral drugs like Emtricitabine, cobicistat, or darunavir.
At first, Tafnat is belongs to anti-retroviral (nucleoside reverse transcriptase inhibitor), now Tafnat has anti-hepaciviral property which is used against hepatitis B viral infection
Prior usage of Tafnat tablet, used in HIV-1 infection Tafnat tablet is also indicated for the treatment of hepatitis B viral infection, by reducing the advancement of virus Tafnat used in chronic hepatitis B infection, is non-curable but it can able to prevent the viral transmission
HOW TAFNAT WORKS
Tafnat -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 TAFNAT TABLET
The usual dosage of Tafnat tablet is, one tablet containing 25mg of Tenofovir Alafenamide should be taken as a single dose Tafnat tablet should be administered with food In creatinine clearance range <15ml/min, Tafnat is not recommended In decompensated cirrhosis: Tafnat 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 TAFNAT TABLETS
After an oral administration, absorption of Tafnat tablet occurs rapidly. The peak plasma time occurs within 0.48 hours The effect of food while taking Tafnat tablet is includes as; With high fat meal, the effect of tenofovir Alafenamide is 1.65 Tafnat 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 TAFNAT TABLETS
Tafnat combined with P-gp or BCRP strong inhibitors, results as alteration of absorption of tenofovir Alafenamide P-gp or BCRP inducers, combined with Tafnat tablets leads to cause loss of therapeutic effect of Tafnat Tafnat with P-gp or BCRP moderate inhibitors results as absorption elevation thus causes plasma concentration of tenofovir Alafenamide Tafnat 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 Tafnat 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 Tafnat 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
Tafnat is rational use, in some patients placental transformation happens In breast feeding and lactation condition, Tafnat is used only under the guidance of medical practitioner.
Tafnat tablets container is stored under room temperature below 30°C Tafnat container should be kept in dry and cool place and should be free from heat, moisture Protect from light
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 Tafnat with separation coefficient of 54%
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.