Pentosan - how often do you give it?

resurrecting this older thread to ask:

I’m starting my 7 y/o TB gelding w/ an SI history (sound now due to good muscling and daily exercise) on Pentosan this week. Should I discontinue his Smartflex II oral supplement?

The mare I rode (leased) for a year was getting it weekly. The owner is a vet and supplied it.