I have come across real pharmaceutical potassium for my upcoming clen cycle.

It is called Span - K

The reason I'm posting is it is a sustained release tablet containing potassium chloride 600mg.

Most sources seem to indicate a 200-400mg daily dose before bed on an empty stomach.

Should I just break one in half and have half a day.

I wouldn't ask except this differs a bit from your garden variety health food store potassium. (Is health food potassium in the chloride form?)