overdose

From The Collaborative International Dictionary of English v.0.48:

Overdose \O`ver*dose"\, v. t.
   To dose to excess; to give an overdose, or too many doses,
   to.
   [1913 Webster]
.

From The Collaborative International Dictionary of English v.0.48:

Overdose \O"ver*dose`\, n.
   Too great a dose; an excessive dose.
   [1913 Webster]