The FDA is expected to release an advisory today that calls on doctors to use a genetic test before prescribing abacavir -- sold by GlaxoSmithKline under the name Ziagen -- to prevent severe allergic reactions in patients carrying an immune-system gene variant. The recommendation will be included in a "black box" warning on Ziagen's new label, which will also mention the increased risk of heart attack based on "inconclusive" study data.

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