One of the biggest downsides to taking a medication is side effects. After a dose of most drugs, the amount in the bloodstream spikes quickly, and then is flushed away within the course of a few hours. This means the amount of medicine in the body can vary at any point in time – and that spike can mean nasty side effects.
This problem is exactly what extended release (often noted as ER or XR) drugs were designed for. See More