A federal judge has nixed the proposed $100 million settlement by one of the defendants named in the massive fen-phen and Redux diet-drug litigation, finding that the class action fell short of the strict rules that govern such “limited fund” settlements.

The ruling by Senior U.S. District Judge Louis C. Bechtle means that Interneuron Pharmaceuticals Inc. must continue to defend itself against a slew of lawsuits in both the state and federal courts.