Buspar (buspirone) Can cause agitation initially, depending on the dose.
Unlikely. Though I have never seen this, Buspar (buspirone) does have an affinity for Dopamine receptors as well as serotonin, but specific effects are not known. Increase in Dopamine and norepinephrine are likely involved with mania. It is more likely from uncontrolled cycling and appropriate dosing of a mood stabilizer is the most important. Please discuss this with your prescribing physician.
Haven't seen it. Buspar (buspirone) vs bupropion. I have not seen Buspar (buspirone) trigger mania or hypomania. There can be paradoxic reactions which lead to aggitation. Are you referring to bupropion (similar sounding name) or wellbutrin. It would be quite rare for buproprion to trigger mania/ hypomania.