[anonymously]

“Equal distribution of medicine in split tablets is questionable. Studies have shown that the actual dose in each half of a split tablet often is different. So while the two halves may look the same, they don’t necessarily contain equal amounts of medicine. Even if the tablet is scored with a line that runs down the middle, one half may actually have more medicine than the other”.
Above is an excerpt from:
http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm171492.htm