Well then you know @Muffin12 that for many people MH issues are more of a chronic disease.
And while people say that MH issues are treatable, very few people say curable
So like Type I diabetes it can be treated but it cannot be cured, those people will always rely on insulin given to them, because they cannot make their own. Although some lucky people do manage a complete remission of MH symptoms (you never know if it's permanent)
So, I suppose with MH issues, it's a matter of finding the right medication, therapy and supports especially to get through the acute stages. Of course you hope that you will have good times that last for long periods. I'm not sure if people have some residual symptoms that continue throughout like procrastination, or whether they can have some truly asymptomatic times.
I have stopped my medications a few times, the longest I ever lasted was about a year, then I realised I was getting too unwell and went back to GP to restart.