In the USA the FDA will meet end of November for its decision regarding the approval of TAF 25MG for hbv. I would assume that it will be available a few I month later in the EU.
Currently DESCOVY 25mg TAF plus 200mg emtricitabine is alead approved for hiv in the USA and canada. It could well be used for hbv, most likely at 1/2 tablet a day for hbv for patients who do not tolerate viread.
the emtricitabine. ..also called FTC, is also used in TRUVADA at the same dose, which is frequently used by hepatologists for patients with a suboptimal response to viread.