"Time-release" drugs have the advantage of releasing the drug to the body at a constant rate so that the drug concentration at any time is not too high as to have harmful side effects or too low as to be ineffective. A schematic diagram of a pill that works on this basis is shown below. Explain how it works.

Transcribed Image Text:

Elastic inmpermeabie membrane Semipermeable membrane Saturated NaCl solution Drug Rigid wall containing tiny holes