These include cancer and immune-inflammatory biotech drug company Celgene ( CELG), pharmacy benefits manager and health information systems supplier SXC Health Solutions ( SXCI), economic, financial, and political researcher IHS Inc ( IHS), and shale oil and gas producer Continental Resources ( CLR).

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Re-packaging to smaller quantities in the pharmacy for patients has meant some packs no longer contain the warning information included in the manufacturers packaging.

BBC: NEWS | Health | Warning to patients on toxic drug