Hospira Inc. (HSP) said it received a warning letter on April 1 from the U.S. Food and Drug Administration saying the specialty drug maker's response to findings last year of quality issues at a plant in Italy was lacking.

The Lake Forest, Ill., company said in a regulatory filing on Tuesday that the FDA warning letter doesn't restrict production or shipments from the plant in Liscate, Italy. Hospira said it is evaluating possible corrective actions and related costs to address issues raised in the warning letter.

Among problems with the Italian plant, the FDA said investigators found Hospira failed to establish and follow appropriate written procedures to prevent potential contamination and that its quality-control systems didn't adequately ensure the accuracy and integrity of data it generated to support product quality.

The FDA requested Hospira to provide a plan to investigate the extent of deficiencies in its documentation processes, a risk assessment of the potential impact on drug quality and plans to correct violations and prevent future ones.

The disclosure comes about a week after Hospira said it would need regulatory approval to sell products made at one of its locations in India, after an inspection found several potential violations.

Problems with Hospira's manufacturing quality in recent years have contributed to product shortages and recalls.

Write to Tess Stynes at tess.stynes@wsj.com

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