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AbbVie (NYSE: ABBV) has initiated legal action in the US to safeguard its blockbuster drug Rinvoq (upadacitinib) from generic market entries by Switzerland-based Sandoz (SWX: SDZ) and Indian pharmaceutical companies Aurobindo Pharma (NSE: AUROPHARMA), Hetero Labs, Intas Pharmaceuticals, and Sun Pharmaceutical (NSE: SUNPHARMA). Despite holding patents on the JAK inhibitor…