The FDA received 20,745 reports of serious drug reactions -- including 4,824 fatalities -- from January to March, according to the Institute for Safe Medication Practices' analysis of federal data. The number of cases was the highest for any calendar quarter, the watchdog group said. Contaminated batches of the blood thinner heparin and Pfizer's Chantix, an anti-smoking medication, accounted for a significant portion of the cases, according to the report.

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