This medication is used by many thousands of Australians.
In the USA it comes in 9 tablet dosages allowing for a dosage that in most cases can be fulfilled with a single tablet.
Cracking tablets in half is not recommended because of uneven distribution of the drug within the tablet.
In Australia tablets come in 3 dosages

The bean counters having worked out that combinations plus cracked in half tablets can cover requirements.
Thus if you need a 3 milligram dose, 1+2=3, 2+2=4 and so on; trouble is you have to buy two lots of tablets, so double the cost of your medication.

But you’re saving the Government some money, so you are doing your bit.