| Completed | 3 | 326 | US, RoW | dextromethorphan hydrobromide 20 mg and quinidine sulfate 10 mg, AVP-923, Nuedextaâ„¢, DM 20 mg/ Q 10 mg, DMQ, dextromethorphan hydrobromide 30 mg and quinidine sulfate 10 mg, DM 30 mg/ Q 10 mg, Placebo | Avanir Pharmaceuticals, Syneos Health | Pseudobulbar Affect (PBA) | 06/09 | 09/09 | | |