Taking weight off with a glucagon-like peptide-1 (GLP-1) receptor agonist and keeping it off once the drug has been discontinued has been a tall order but Response Pharmaceuticals Inc. is seeing progress. Top-line results from its randomized, double-blind, placebo-controlled, parallel-group phase II study of RDX-002, in those who had already wrapped up a GLP-1 receptor agonist course for reducing obesity, were positive.