How many people are being treated with just 1 medication?

My pdoc has me just on seroquel xr at the moment @200mg every night and i see him again in 2 weeks. Sometimes this knocks me out and other times it hardly makes me drowsy.

My mania has some psychotic parts but nothing serious.

I never really thought to ask why im only on that and not a mood stabilizer or antidepressent but will def ask him when i see him next.

Anyone else just using the one med?