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WARNINGS Necrotizing Enterocolitis During the double-blind, placebo-controlled clinical trial, 6 cases of necrotizing enterocolitis developed among the 85 infants studied (caffeine=46, placebo=39), with 3 cases resulting in death. Five of the six patients with necrotizing enterocolitis were randomized to or had been exposed to caffeine citrate. Reports in the published literature have raised a question regarding the possible association between the use of methylxanthines and development of necrotizing enterocolitis, although a causal relationship between methylxanthine use and necrotizing enterocolitis has not been established. In a published randomized, placebo-controlled, clinical trial that studied the use of caffeine citrate in apnea of prematurity in approximately 2,000 patients, necrotizing enterocolitis was not more common in caffeine treated patients compared to placebo. As with all preterm infants, patients being treated with caffeine citrate should be carefully monitored for the development of necrotizing enterocolitis.
ADVERSE REACTIONS Overall, the reported number of adverse events in the double-blind period of the controlled trial was similar for the caffeine citrate and placebo groups. The following table shows adverse events that occurred in the double-blind period of the controlled trial and that were more frequent in caffeine citrate-treated patients than placebo. ADVERSE EVENTS THAT OCCURRED MORE FREQUENTLY IN CAFFEINE CITRATE-TREATED PATIENTS THAN PLACEBO DURING DOUBLE-BLIND THERAPY Adverse Event (AE) Caffeine Citrate N=46 Placebo N=39 n (%) n (%) BODY AS A WHOLE Accidental Injury 1 (2.2) 0 (0.0) Feeding Intolerance 4 (8.7) 2 (5.1) Sepsis 2 (4.3) 0 (0.0) CARDIOVASCULAR SYSTEM Hemorrhage 1 (2.2) 0 (0.0) DIGESTIVE SYSTEM Necrotizing Enterocolitis 2 (4.3) 1 (2.6) Gastritis 1 (2.2) 0 (0.0) Gastrointestinal Hemorrhage 1 (2.2) 0 (0.0) HEMIC AND LYMPHATIC SYSTEM Disseminated Intravascular Coagulation 1 (2.2) 0 (0.0) METABOLIC AND NUTRITIVE DISORDERS Acidosis 1 (2.2) 0 (0.0) Healing Abnormal 1 (2.2) 0 (0.0) NERVOUS SYSTEM Cerebral Hemorrhage 1 (2.2) 0 (0.0) RESPIRATORY SYSTEM Dyspnea 1 (2.2) 0 (0.0) Lung Edema 1 (2.2) 0 (0.0) SKIN AND APPENDAGES Dry Skin 1 (2.2) 0 (0.0) Rash 4 (8.7) 3 (7.7) Skin Breakdown 1 (2.2) 0 (0.0) SPECIAL SENSES Retinopathy of Prematurity 1 (2.2) 0 (0.0) UROGENITAL SYSTEM Kidney Failure 1 (2.2) 0 (0.0) In addition to the cases above, three cases of necrotizing enterocolitis were diagnosed in patients receiving caffeine citrate during the open-label phase of the study. Three of the infants who developed necrotizing enterocolitis during the trial died. All had been exposed to caffeine. Two were randomized to caffeine, and one placebo patient was “rescued” with open-label caffeine for uncontrolled apnea. Adverse events described in the published literature include: central nervous system stimulation (i.e., irritability, restlessness, jitteriness), cardiovascular effects (i.e., tachycardia, increased left ventricular output, and increased stroke volume), gastrointestinal effects (i.e., increased gastric aspirate, gastrointestinal intolerance), alterations in serum glucose (i.e., hypoglycemia and hyperglycemia), and renal effects (i.e., increased urine flow rate, increased creatinine clearance, and increased sodium and calcium excretion). Published long-term follow-up studies have not shown caffeine to adversely affect neurological development or growth parameters. A published randomized, placebo-controlled, clinical trial in premature infants with birthweights of 500 to 1,250 grams studied the safety of caffeine citrate in apnea of prematurity (NCT00182312). This trial randomized approximately 2,000 premature infants with a mean gestational age of 27 weeks at birth. The median duration of caffeine therapy was 37 days. Prior to discharge home, death, ultrasonographic signs of brain injury, and necrotizing enterocolitis were not more common in the caffeine citrate group compared to the placebo. At follow up at both 18 months and 5 years corrected age, death was not more common in the caffeine citrate treated group compared to placebo, nor did caffeine citrate use adversely affect neurodevelopmental outcomes. To report SUSPECTED ADVERSE REACTIONS, contact Sagent Pharmaceuticals at 1-866-625-1618 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .