Electronic pills have been used for diagnostic applications such as imaging, but the iPill from Philips Research, designed to treat gastrointestinal disorders, goes a step further, dispensing medication at a location and rate programmed by a physician. The disposable capsule, which is about the same size as an ordinary pill, contains a tiny computer, a wireless transmitter, and a series of sensors; it passes naturally through the digestive system after being swallowed with food or water. Although the iPill is still a prototype, Philips is about to begin testing it in animals and is working with pharmaceutical companies to evaluate what drugs might work best with it.

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