Abstract: The feed duct of a tablet dispenser is formed with a movable wall portion which engages a tablet next adjacent the tablet being dispensed to prevent more than a single tablet from being dispensed at a time. A dispenser slide which opens and closes the discharge opening of the feed duct actuates displacement of the movable wall portion through an interposed spring member. Another movable wall portion of the feed duct located further upstream may operate in tandem with the first wall portion to block the feed duct and thereby prevent backward movement of tablets within the feed duct while the discharge opening is closed.