• Pfizer is the country's largest manufacturer of generic injectable drugs, and these shortages have gotten worse as the Food and Drug Administration uncovered serious safety concerns at multiple Pfizer facilities.
• The FDA has loosened some of its restrictions in the face of growing shortages, allowing Pfizer to sell some products that normally would have to be recalled.

The issue: These drugs' low profit margins are part of the reason more companies don't manufacture them, FDA Commissioner Scott Gottlieb told the Times.

• “We are still in the position of trying to put a Band-Aid on a market that fundamentally hasn’t changed,” he said. “Today it’s one drug, tomorrow is going to be another drug. We’ve got to think of something more holistic and comprehensive.”