Amid a rising toll of opioid overdoses, recommendations discouraging their use to treat pain seem to make sense. Yet the devil is in the details: how recommendations play out in real life can harm the very patients they purport to protect. A new proposal from the Centers for Medicare and Medicaid Services to enforce hard limits on opioid dosing is a dangerous case in point.

There’s no doubt that we needed to curtail the opioid supply. The decade of 2001-2011 saw a pattern of increasing prescriptions for these drugs, often without attention to risks of overdose or addiction. Some patients developed addictions to them; estimates from the Centers for Disease Control and Prevention range from 0.7 percent to 6 percent. Worse, opioid pills became ubiquitous in communities across the country, spread through sale, theft, and sharing with others, notably with young adults.