“In the past couple of years, it’s just been exponential,” says Diane Ginsburg, the immediate past president of the American Society of Health-System Pharmacists and clinical professor and assistant dean for student affairs at the University of Texas’ College of Pharmacy in Austin.
According to the FDA, 77% of the shortages in 2010 involved sterile injectable drugs.
“There are fewer and fewer firms making these older sterile injectables, and they are often discontinued for newer, more profitable agents,” FDA spokeswoman Yolanda Fultz-Morris says in an email. “When one firm has a delay or a manufacturing problem, it is extremely difficult for the remaining firms to quickly increase production.”
The biggest cause for the shortages in those drugs has been product quality issues, namely microbial contamination and newly identified impurities, according to the FDA. From January to October of 2010, 42% of drug shortages were due to quality problems.