? Nearly six months ago, Heron was handed an unexpected rejection by the FDA due to manufacturing concerns for HTX-011 ? a long-acting non-opioid painkiller for post-surgical analgesia that would?ve rivaled Pacira Pharmaceuticals? J&J-partnered, long-acting post-op painkiller Exparel. On Monday, the San Diego company said the US regulator had accepted its resubmitted marketing application. The FDA is expected to make its decision by March 26.