To affect with drugs.
To treat with dope (lubricant, etc.).
To add a dopant such as arsenic to (a pure semiconductor such as silicon).
To use drugs; especially, to use prohibited performance-enhancing drugs in sporting competitions.
To judge or guess; to predict the result of.
The use of drugs to improve athletic performance.
The addition of small quantities of an element (a dopant) to a semiconductor to change its characteristics.