| Terminated | 2 | 20 | Europe | Memantine, Ebixa, Placebo | Clinica Universidad de Navarra, Universidad de Navarra, H. Lundbeck A/S | Multiple Sclerosis | 03/08 | 03/08 | | |
| Completed | 2 | 299 | Europe | Memantine, Placebo | Merz Pharmaceuticals GmbH | Memory Disorder, Retention Disorder, Cognitive, Subjective Cognitive Impairment, Memory, Concentration or Attention Problems | 08/11 | 09/11 | | |