At the ripe old age of 73, I take six drugs — four prescription and two over-the-counter pills — every day. I keep careful track of them.

But recently, when I received a refill, I noticed my blue pill was now yellow. I was startled, but this was not the first time my pills had morphed into different colors. A few months ago, my white and blue capsule had become white and purple, and before that, my pink tablet turned blue. 

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