Figure 6.

Naltrexone‐precipitated body weight loss during and after chronic treatment of either morphine alone or morphine in combination with 2‐BFI. The starting body weights before the first naltrexone test (week 1) were 331 ± 5.1 and 333 ± 5.1 g for morphine treatment and combo treatment groups respectively. Data were expressed as the % body weight loss and plotted as a function of time (weeks). *P < 0.05; significantly different from the morphine treatment group; two‐way repeated measures ANOVA followed by Bonferroni's test; n = 9 per group.