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. Author manuscript; available in PMC: 2016 Jul 4.
Published in final edited form as: Curr Drug Metab. 2014;15(7):743–756. doi: 10.2174/1389200216666141208151524

Fig. (5).

Fig. (5)

Drug delivery system strategies. A) Current drug delivery methods typically involve releasing a drug at a relatively constant rate. B) Smart drug delivery systems have both a sensing and effector component. This can allow drug release to either be activated (or inhibited) in response to a specific stimulus (e.g., pH, light, or specific biomarkers) or regulated in a feedback-dependent manner to provide a consistent free drug concentration.