The line you might find on some tablets is called a Score. The purpose of the score is to allow the tablet to be broken in half if the dosage calls for it. If your product does not have a score, you may want to advise your customers not to break the tablet in half without consulting with you, the brand, or their physician first. In some cases (i.e. the tablet is a slow release formula), breaking the tablet in half could be hazardous.