Q: My wife and I were told that giving Bute (phenylbutazone) to a mare in foal can cause heart defects in the foal, similar to aspirin taken by women in early pregnancy. Is there any connection? A: Signs of phenylbutazone toxicity in foals whose dams are treated with the drug are rare. However, some researchers have reported that the blood levels in foals from treated mares are similar...

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