Did you mean 15mgm tabs-? as my Bisoprolol tabs are 2 .5mg & I usually break in half, so take 1.25mg!This is my 'pill in the pocket' so I take them infrequently! Only when I'm having an AF episode!
When I took the 2.5mg tablet I felt quite weak, so my GP recommended halving the dose!
Best wishes to you
DellaCat28