Release of levetiracetam from extended-release tablets that appear intact in patient stool.
A generic levetiracetam ER 500xA0;mg tablet from Lupin produced tablet remnants in patient stool.
Other levetiracetam ER generics do not yield tablet remnants in patient stool.
The Lupin generic released all drug.
Patients should be aware that some generic ER tablets may appear in the stool.