Running low on both my cats and dogs flea & heart-worm prevention treatment.
I find it works well and do i on average every 6-8 weeks (only because of how hard it is to actually get the animals to co-operate) and it is still very effective.
Not sure when it ends.
The whole Advocate fleas & heart-worm range seems to be on sale - https://www.petcircle.com.au/nav/brand/advocate
Don't they do one that covers ticks?