Rats were exposed to daily 3-hr schedule-induced polydipsia sessions (fixed-time 1 min food-pellet delivery) with a cocaine hydrochloride solution as the available session fluid. Cocaine intake level ( mg kg ) was a direct function of solution concentration (0.02–0.2 mg ml ). In a second experiment with 0.15 mg ml cocaine solution available, mean daily session cocaine intake remianed constant at about 40 mg kg over the 5-week period of the experiment. Post-session serum samples of animals drinking either 0.15 or 0.2 mg ml cocaine solution yielded serum cocaine values that were similar to those producing subjective “highs” in coca-leaf chewers and experienced users of cocaine. The schedule-induction technique can be used to induce the intake of drug solutions, including those which perhaps taste bitter, so that chronic and pharmacologically significant consequences ensue.