Abstract
Treating tinnitus with modern Western medicines is difficult. Several studies have reported that Kampo medicines are efficacious for treating tinnitus, and therefore, it is expected that these medicines will gain widespread use in the future for tinnitus treatment. We retrospectively examined the efficacy of Kampo medicines prescribed on the basis of Kampo diagnoses for chronic tinnitus patients. The study population included 331 patients (114 men, 217 women) and average age was 57.8 years. The overall effective rate of Kampo medicines in tinnitus was 38.4% and increased to 64.6% after including effects for the accompanying symptoms (e.g., dizziness, insomnia, and headache). Hangekobokuto was prescribed most frequently. The effective rate for hangekobokuto in tinnitus was 32.1% and significantly increased when it was used in combination with a herb, chotoko (Hook of Uncaria, rhynchophylla Miquel) (p < 0.05, Fisher's exact test). The effects and modern pharmacological action of chotoko indicate that it may be effective for tinnitus. Given that tinnitus was intractable in study subjects who had been treated using other therapy approaches earlier (84% of the population), the findings indicate that Kampo medicine may be partially effective for tinnitus.
