Ed, the normal 'sex' dose is 20mg. You can split it in 2 or even 4 parts to use daily. The parts don't have to be absolute same-sized, so irregular will work. Daily dose is 5mg, so if split in half, maybe consider taking half every other day?
James C, 65, A Better Man /Injections? Read This
4/07: PSA 7.6, 3/16 PCa, 5% inv, lf. lobe, GS6
open RP, Path: pT2c, 110 gms., Prob. micro.inv.-left apical margin -GS6
5 Yrs: .04 'til 4/10-.06, 12/10-.09, 5/11-.08, 9/11-.14, 2/12-.10, 7/12-.13