The FDA on Monday advised doctors to refrain from using heparin made by Baxter International, or to use it with "caution when medically necessary," after receiving 350 reports this year of vomiting, nausea and breathing difficulty. The agency ruled out a recall since that could lead to a critical shortage on heparin, but government inspectors are examining Baxter's manufacturing sites to determine the cause of the problem, the FDA said. The Deerfield, Ill.-based drugmaker said it will temporarily stop manufacturing the drug and will cooperate with the investigation.

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