The US Food and Drug Administration (FDA) has approved Teva Pharmaceutical’s generic version of blockbuster Alzheimer’s medication Aricept.

Teva confirmed on Wednesday that it had already begun shipping the drug in both 5mg and 10mg tablets.

Aricept, jointly marketed by Pfzier and Eisai, had been the market leader amongst Alzheimer’s medications and is used to treat symptoms including memory loss, aggression and confusion.

After Pfizer lost exclusivity in November last year, sales of brand-name and generic Aricept are expected to total $2.3bn in the US alone, according to Teva.