ACHE and early-onset autosomal dominant Alzheimer disease: Pharmacological agents licensed for Alzheimer’s disease (such as acetylcholinesterase inhibitors and N-Methyl-D-aspartate receptor antagonists) have been used off-label in PSP, CBD, and other tauopathies with the aim of improving cognition; however, there is limited evidence that they are effective and risk of adverse effects may outweigh benefits.