Why would a sane clinician not prescribe prophylactic indomethacin?

MeSH terms

• Anti-Inflammatory Agents, Non-Steroidal / adverse effects
• Anti-Inflammatory Agents, Non-Steroidal / therapeutic use*
• Cardiovascular Agents / adverse effects
• Cardiovascular Agents / therapeutic use*
• Clinical Trials as Topic
• Ductus Arteriosus, Patent / prevention & control*
• Humans
• Indomethacin / adverse effects
• Indomethacin / therapeutic use*
• Infant, Newborn
• Infant, Premature
• Infant, Premature, Diseases / prevention & control*
• Practice Patterns, Physicians'*