I think one positive outcome of this story may be in reminding us all that prescription drugs are still drugs, and that they can be used and abused in any number of potentially harmful ways, just as illicit drugs can be. We in the West are very much a drug culture, throwing pills at every imaginable kind of problem, avoiding the behavioral therapies that earlier eras used (and, admittedly, not always successfully) to grapple with emotional and mental stress. We don't see how our very lifestyles can become toxic--Heath's schedule leading up to his death sounded positively inhuman. So we take uppers (caffeine), downers (alchohol), and everything in between (cigarettes, chocolate) to cope.
Drugs can be wonderful tools in bettering our lives, but they must be used with moderation and wisdom. And in the drug-obsessed culture in which we now live, wisdom in this area is often in short supply.