Caroverine

Caroverine is an antagonist of non-NMDA and NMDA glutamate receptors. Cochlear synaptic tinnitus arises from a synaptic disturbance of NMDA or non-NMDA receptors on the afferent dendrites of spiral ganglion neurons. This forms a basis for the use of caroverine in the treatment of tinnitus. Hence, the present study was carried out to find the effect of oral caroverine in the treatment of tinnitus.

This quasi-experimental study was carried out on sixty consecutive patients of tinnitus. Thirty patients were given the usual standard of care consisting of Tab. Cinnarizine 25mg twice daily along with fixed dose combination Cap. B-complex and Ginkgo biloba once daily for ninety days and thirty patients were given Cap. Caroverine 40mg, twice daily for ninety days. Outcome assessment was done using the tinnitus case history questionnaire, tinnitus handicap inventory score, and VAS. The data were analyzed using GraphPad Prism Trial Version. A P value ≤ 0.05 was taken as statistically significant.

There was a significant improvement in the tinnitus case history questionnaire score at 90 days in patients suffering from mild tinnitus when treated with caroverine. There was a larger decrease in the tinnitus handicap inventory score at 90 days of treatment in the caroverine-treated patients. The median VAS showed an improvement in the caroverine-treated group. The overall reduction in tinnitus in the caroverine-treated group was 53.3% with an odds ratio, 95% CI of 0.375 (0.12-1.08).

Oral caroverine was found to be better than the usual standard of care in reducing mild cochlear synaptic tinnitus. It also improved sensory–neural hearing loss during the treatment period.

Reported the cobalt(II)-catalyzed C-H alkylation and acylation of N-heterocycles with 1,4-dihydropyridines (DHPs) as alkylating and acylating agents.Notably, a combination of KBrO₃ and a Co(II) catalyst were successfully employed for the generation of alkyl and acyl radicals from DHPs.A series of heterocycles, including azauracils, quinoxalinones, pyrazinones, pyridones, quinolones, quinazolinones, xanthines, chromones and azine N-oxides, were compatible under the developed conditions.The applicability of the developed protocol in challenging contexts is highlighted by the selective modification of drug candidates as well as the gram-scale synthesis of bioactive mols.Combined mechanistic investigations aided the elucidation of a plausible reaction mechanism.