Oxybutynin-xanomeline transdermal therapeutic system combinations

Abstract

Transdermal therapeutic system and method of using the same for safely treating hypocholinergic disorders of the central nervous system such as Alzheimer type dementia. The transdermal therapeutic system comprises oxybutynin in combination with a cholinergic receptor agonist (CRA) such as xanomeline.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of U.S. Provisional Application No. 62 / 129,279, filed Mar. 6, 2015; and U.S. Provisional Application No. 62 / 144,010, filed Apr. 7, 2015; the entire disclosures of each of which are hereby incorporated herein by reference.OBJECT OF THE INVENTION[0002]The invention relates to a transdermal therapeutic system containing 4-diethylaminobut-2-ynyl 2-cyclohexyl-2-hydroxy-2-phenylethanoate, known under its International Non-proprietary name as oxybutynin, or a pharmaceutically acceptable salt thereof, for use in the treatment of Alzheimer type dementia, in combination with 3-[4-(Hexyloxy)-1,2,5-thiadiazol-3-yl]-1,2,5,6-tetrahydro-1-methylpyridine, known under its International Non-proprietary name as xanomeline, a Cholinergic Receptor Agonist (CRA). The invention also concerns use of such a transdermal therapeutic system in a method for enhancing the maximal efficacy and maximal tolerated dose of a CRA in a patient...

AI Technical Summary

Benefits of technology

The present invention provides a new tool for treating Alzheimer type dementia by enabling the full efficacy of CRAs (cholinergic receptor agonists) while reducing their associated adverse effects. This is achieved by using a transdermal therapeutic system containing a combination of oxybutynin and xanomeline, which counteracts the adverse effects of xanomeline and allows for the administration of higher doses without inducing central adverse effects. The invention also provides a method for treating Alzheimer type dementia by administering the transdermal therapeutic system to a patient in need. The combination of oxybutynin and xanomeline in the transdermal therapeutic system produces no adverse effects on cognitive function and increases muscarinic receptor stimulation while reducing the risk of adverse effects associated with oxybutynin alone.

Problems solved by technology

CRAs have been reported to dose-dependently improve the cognitive disturbances associated with schizophrenia, but the effect of CRAs is of limited size and dose-dependent side effects prevent further increases in the CRA doses.

Unfortunately, however, none of the currently available AChEIs offers more than modest clinical benefit for patients suffering from any of the aforementioned dementing disorders, even when these medications are administered at their maximum safe and tolerated doses.

This is the first problem limiting the success of current AChEI therapy of Alzheimer type dementias.

A second problem limiting the success of current AChEI therapy of Alzheimer type dementias is that, even at recommended amounts, all these drugs produce dose limiting adverse reactions, mainly if not exclusively, by over-stimulating peripheral cholinergic receptors of the muscarinic type.

As a result, signs and symptoms of untoward gastrointestinal, pulmonary, cardiovascular, urinary, and other systems dysfunction occur.

Another way to increase the cholinergic transmission in the brain is to stimulate post-synaptic cholinergic receptors by administering an agonist of the muscarinic receptors, but the results were generally disappointing.

Compared to placebo, xanomeline was shown to significantly improve cognitive and behavioral symptoms of Alzheimer disease (Bodick et al, 1997), but also caused dose-dependent unacceptable side effects, including bradycardia, gastro-intestinal distress, excessive salivation, and sweating.

Dose-limiting adverse events attending the use of drugs that stimulate cholinergic transmission, such as xanomeline, appear to primarily reflect the excessive stimulation of peripheral cholinergic receptors, especially those of the muscarinic type (mAChRs), such that in both healthy volunteers and Alzheimer's patients many of these side effects have been reported for xanomeline; in the patient population this led to a discontinuation rate higher than 50% while the effects on cognition were not as robust and mainly seen at the highest doses tested (Mirza et al.

The literature does not teach how to take advantage of the ubiquitous, potent activity of the muscarinic agonists safely.

This possibility becomes a-priori a material risk if it is intended to be used for the treatment of Alzheimer type dementia in combination with a CRA such as xanomeline, due to the competitive action of the two drugs inside the CNS.

In addition, this document observes that these drugs are known to penetrate the blood-brain barrier and may therefore inhibit the therapeutic effects of the agonist in the brain.

In summary notwithstanding great scientific effort, the problem of the safe treatment of hypocholinergic disorders of the nervous system such as Parkinson's dementia, Lewy body diseases, Down Syndrome, and chronic neuropathic pain remains unsolved.