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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Exp Gerontol. 2010 Oct 15;46(1):65–72. doi: 10.1016/j.exger.2010.10.004

Figure 3. Body weight.

Figure 3

Changes in body weight during fentanyl/saline administration and withdrawal. Other details as in Figure 2. Note that fentanyl resulted in decreased body weight across ages during the Early and Late drug administration, and during Early withdrawal. By 28 days of withdrawal, the youngest animals returned to baseline levels. a p < 0.05 compared with 12 month old animals.