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Table 1 AChEI agents approved by the FDA: prescription share and prescription volume

From: Current pharmacologic options for patients with Alzheimer's disease

Agent for AD Treatment Prescription Share Prescription Volume
Tacrine < 1%
Donepezil ~66% ~530,000
Rivastigmine ~20% ~160,000
Galantamine ~14% ~110,000
  1. Source: IMS NPA Audit via SMART, 2002 (annualized).