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. Author manuscript; available in PMC: 2012 Jun 12.
Published in final edited form as: Psychopharmacology (Berl). 2007 Dec 27;197(1):157–168. doi: 10.1007/s00213-007-1020-8

Figure 4.

Figure 4

Average amount of money spent on marijuana self-administration during the four days following a 3-day period of marijuana abstinence (inpatient days 7–10) as a function of THC (60 mg/day), lofexidine (2.4 mg/day) and the THC (60 mg) and lofexidine (2.4 mg/day) combination. Asterisks indicate a significant difference between medication and placebo (* p < 0.05; ** p < 0.01). Error bars represent ± standard error of the mean (SEM).