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Auris Medical Announces Positive Top-Line Data from AM-201 Phase 1b Study in Antipsychotic-Induced Weight Gain and Provides Update on TRAVERS Phase 2 Study
- Administration of intranasal betahistine 30 mg shows statistically significant reduction in olanzapine-induced weight gain
- Treatment well tolerated and safe with no adverse effects
- Enrollment into Phase 2 TRAVERS trial with AM-125 resumed following break due to COVID-19 pandemic
The Phase 1b trial demonstrated good safety and tolerability of ascending doses of AM-201 as well as a dose-dependent reduction in weight gain in healthy volunteers treated with oral olanzapine (10 mg) for four weeks. At the highest AM-201 dose of 30 mg administered three times daily, the mean weight gain from baseline to the end of the treatment period was 2.8 kg compared against 3.7 kg in control subjects; the primary efficacy endpoint of mean reduction in weight gain was 0.9 kg and statistically significant (p<0.02; n=81 with pre-specified Bayesian augmented controls). As expected, intranasal delivery of betahistine allowed for substantially higher concentrations in blood plasma compared with levels previously reported for oral betahistine.
“We are very pleased with the positive safety, efficacy and pharmacokinetic outcomes achieved with intranasal betahistine in our first clinical trial for the prevention of antipsychotic-induced weight gain“, commented
In addition, the Company announced that the Phase 2 TRAVERS trial with AM-125 in acute peripheral vertigo has resumed enrollment. The COVID-19 outbreak had led to a standstill of recruitment towards the end of
Betahistine is a small molecule structural analog of histamine, which acts as an agonist at the H1 and as an antagonist at the H3 histamine receptors. Unlike histamine, it crosses the blood-brain-barrier. It is known to enhance inner ear and cerebral blood flow, increase histamine turnover and enhance histamine release in the brain, increase release of acetylcholine, dopamine and norepinephrine in the brain and to result in general brain arousal. The compound has a very good safety profile, yet it is also known that its clinical utility is held back by poor bioavailability. Intranasal administration of betahistine has been shown to result in 5 to 29 times higher bioavailability.
Intranasal betahistine is being developed under project code AM-125 for the treatment of acute vertigo. Betahistine has been shown to increase cochlear, vestibular and cerebral blood flow, facilitate vestibular compensation and inhibit neuronal firing in the vestibular nuclei. Betahistine for oral administration is approved in about 115 countries, with the US being a notable exception, for the treatment of vertigo and Meniere’s disease.
Intranasal betahistine is being developed under project code AM-201 for the prevention of antipsychotic-induced weight gain and somnolence. Many antipsychotic drugs are known to block the H1 histamine receptor, which is involved in the control of appetite and wakefulness, resulting in weight gain and somnolence as side effects. As an H1 receptor agonist, betahistine is thought to counteract the antipsychotics’ inhibitory effects; in addition, betahistine blocks presynaptic H3 histamine autoreceptors, thus increasing histamine release and in turn augmenting betahistine’s direct agonistic effects on H1 receptors.
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Source: Auris Medical AG