A new random data point: I just started taking the extended-release version of Intuniv (Guanfacine), only 1 mg per day, so a low dose.
My tinnitus resulted from acoustic trauma in my right ear, and I experienced Ménière's-like symptoms for several months afterward, though without vertigo.
Surprisingly, after four days on this medication, I've had no tinnitus exacerbation. Out of the eight blood pressure medications I've tried, this is only the second one I've been able to tolerate. Losartan, Telmisartan, Enalapril, Hydrochlorothiazide, and Indapamide all increased my tinnitus to two to four times its baseline level. Lisinopril caused brain fog and concentration issues.
It's working so well that I'm already having to cut back on Benazepril, and I haven't even titrated up to a standard dose yet.