WASHINGTON (AP) — Federal health regulators are allowing overseas imports of critical intravenous drugs used to nourish premature infants, amid a shortage that has affected hospitals nationwide.

The Food and Drug Administration said Wednesday new supplies of drugs used in total parenteral nutrition, a ubiquitous hospital staple, will be available to U.S. patients this week. The injectable formula is used to feed newborn infants, cancer patients and other vulnerable groups who are unable to eat or drink by mouth.