Which innovative pharmaceutical product design feature was specifically developed to improve medication adherence for elderly patients and has become an industry standard?

The pharmaceutical industry has dramatically evolved its approach to medication design over the decades. From pill shapes and colors to delivery mechanisms, medical product design focuses not just on efficacy but also on patient compliance, error prevention, and accessibility. This trivia question explores a significant innovation in medical product design that transformed patient adherence and safety.

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Blister packaging with days of the week printed on each compartment
Red coating on all cardiovascular medications
Triangle-shaped tablets for pain medications
Grape flavoring in liquid medications