This article is from the Tinnitus FAQ, by email@example.com (Mark Bixby) with numerous contributions by others.
Carbamazepine (Tegretol, a dangerous drug!), phenytoin (Dilantin),
primidone (Mysoline), valproic acid (Depakene) have all shown some
effectiveness in reducing tinnitus. But there is no standard dosage
for tinnitus applications, and some of these drugs may cause dangerous
side-effects that require careful monitoring via blood chemistry and
other tests. Anti-convulsants have not been studied in rigorous
scientific tests for reduction of tinnitus.