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The most prevalent types of dementias, including Alzheimer’s disease, are those that are propagated via the spread of “prion-like” misfolded proteins. Despite considerable effort no treatments are available to slow or stop the progression of these dementias. Here we investigate the possibility that activation of the M₁-muscarinic receptor (M₁-receptor), which is highly expressed in the brain and that shows pro-cognitive properties, might present a novel disease modifying target. We demonstrate that the progression of murine prion disease, which we show here displays many of the pathological, behavioural and biochemical hallmarks of human neurodegenerative disease, is slowed and normal behaviour maintained by the activation of the M₁-receptor with a highly tolerated positive allosteric modulator (VU846). This correlates with a reduction in both neuroinflammation and indicators of mitochondrial dysregulation, as well as a normalisation in the expression of markers associated with neurodegeneration and Alzheimer’s disease. Furthermore, VU846 preserves expression of synaptic proteins and post-synaptic signalling components that are altered in disease. We conclude that allosteric regulation of M₁-receptors has the potential to reduce the severity of neurodegenerative diseases caused by the prion-like propagation of misfolded protein in a manner that extends life span and maintains normal behaviour.