o·ver·pre·scribe 
(ō′vər-prĭ-skrīb)
(ō′vər-prĭ-skrīb)v. o·ver·pre·scribed, o·ver·pre·scrib·ing, o·ver·pre·scribes
v.intr.
To prescribe an excessive amount of a medication.
v.tr.
To prescribe (a medication) in excess of the amount needed.
o′ver·pre·scription (-skrĭpshən) n.