Shares of Questcor Pharmaceuticals Inc (QCOR) are down $2.58, or 3.20%, to $78.00 in pre-market trading Tuesday, after the company was downgraded by investment analysts at Jefferies Group from a “Buy” to “Hold”. The 12-month target price has been reduced to $86 from $89. The downgrade comes on the heels of Mallinckrodt Pharmaceuticals (MNK) announcement made […] View the full post at: Jefferies New Stock Rating On Questcor Pharmaceuticals – (QCOR) Related posts: Cramer: Medicis Pharmaceuticals Looks Attractive Top Pre-Market Stock Upgrades/Downgrades March 29, 2010 After-Hours Earnings (March 1)