Selecting appropriate dose regimens for AM-101 in the intratympanic treatment of acute inner ear tinnitus.

Abstract

Inhibition of cochlear N-methyl-D-aspartate (NMDA) receptors with AM-101, a small molecule antagonist delivered by intratympanic injection, represents a novel approach to treat acute tinnitus triggered by glutamate excitotoxicity. An earlier double-blind, randomized, placebo-controlled phase II clinical trial (TACTT0) had demonstrated a significant and dose-dependent improvement in tinnitus triggered by acute acoustic trauma or otitis media from baseline to day 90. A second phase II trial (TACTT1) now sought to evaluate the most appropriate dose regimen for this treatment. Outcomes from the TACTT1 trial showed no significant difference in tinnitus improvement between a single-dose treatment and a dose regimen comprising three doses over 2 weeks. Taken together, three injections over 3 consecutive days showed the best results in the two phase II trials, suggesting that repeated and concentrated inhibition of cochlear NMDA receptors provides best treatment effects, while keeping the procedural impact on patients short.

• Authors: Hinrich Staecker, Kenneth S Maxwell, John R Morris, Paul van de Heyning, Krzysztof Morawski, Frank Reintjes, Thomas Meyer
• Journal: Audiology & neuro-otology (Audiol Neurootol) Vol. 20 Issue 3 Pg. 172-82 ( 2015) ISSN: 1421-9700 [Electronic] Switzerland
• PMID: 25872149 (Publication Type: Journal Article, Multicenter Study, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)

Chemical References

• Apoptosis Regulatory Proteins
• PDCD5 protein, rat

Topics

• Adolescent
• Adult
• Apoptosis Regulatory Proteins (administration & dosage, therapeutic use)
• Dose-Response Relationship, Drug
• Double-Blind Method
• Female
• Humans
• Injection, Intratympanic
• Male
• Middle Aged
• Tinnitus (drug therapy)
• Treatment Outcome
• Tympanic Membrane (drug effects)
• Young Adult