An extension trial A Study of Lanabecestat (LY3314814) in Early Alzheimer's Disease Dementia is currently in progress but is not expected to complete until 9/2020.
Other investigational drugs have ceased development. A paper here suggests chitosan polysaccharides have in vitro activity as inhibitors.
You would have a history of seizures even if they occured 5 years ago. Histories of disorders go back decades(your lifetime), especially if there is risk of recurrence as in cancer or seizures.
Use cautiously in patients with history of seizures, based on reports
of seizures due to gingko seed ingestion.
Since you need to use it cautiously ...