I tried cutting in halves then those halves in halves (is there even another way to do get quarters without doing that??). There is no lower dose and if I go up a dose I'd have to cut it into 8ths which I'm going out on a limb and saying that cutting quarters in half is going to be harder than cutting halves in half even if the pill's diameter is half a millimeter larger.
I'm just going to crush that pill to powder and separating that into quarters. Probably more accurate that way too.