Arrows were the usual ammunition used in a bow.
The Outsiders on Gallifrey lived in the wild lands outside the Capitol. They maintained a primitive lifestyle, wore animal skins and used weapons like bows, arrows and spears to hunt for food. (TV: The Invasion of Time)
Robin Hood was another skilled archer who taught the Doctor how to shoot a bow and arrow, and the Fifth Doctor used this knowledge to fight U'thai's warriors. (PROSE: The Immortals) Robin faced the Sheriff of Nottingham and the Twelfth Doctor in a contest to find the most skilled archer in Sherwood, although the Doctor later revealed that he cheated and could not fire a bow. Robin, the Doctor and Clara Oswald fired a golden arrow into the Sky vessel in order to boost it out of orbit before it exploded. (TV: Robot of Sherwood)