I experiences ultra rapid cycling without AD, but when I was taking only Welbutrin, they became so intense and I was switching several times an hour. I came off that after 2 years of cray and on to a stabilizer which stabilized me on the depressed side. We now added a low dose of prozac to the mix which brought me back to baseline. I don't experience cycling with that dose of AD. 5 mg more though makes me hypo.