Hormone Question

[marc-87.livejournal.com]

I'm sorry if this is a stupid question but I have been wondering for awhile now. Anyways, everything I read says most of the effects of hormone replacement therapy is irreversible. Like the deepening of the voice (for FtM), fat redistribution, etc. So why do you have to continue taking it? If the majority of the secondary characteristics (at least that is what it seems to be to me) are generally not reversed by stopping the hormone replacement then why do you need to continue? Just curious.