My experience is splitting a pill is less expensive than getting twice as many pills at 1/2 the dose. The only time I had 50
mg tables was for a period that I was on 50
mg once a day. Now all my "stock" is 100 mg pills, and I split, even if I take only 50 mg once a day.
5) while you must not just stop, I can testify that I have changed my dose downward without any problems, e.g., going from 50 mg twice a day to 50 mg once a day.