Almantin 5mg Tablet belongs to a class of medications called N-methyl-D- aspartate (NMDA) receptor antagonists. It works by decreasing abnormal activity in the brain. Almantin 5mg Tablet may improve the ability to think and remember. It may also reduce the deterioration of these abilities in people who have Alzheimer's disease. However, with time the effectiveness of this medicine will reduce and it may not be able to cure Alzheimer's disease or prevent the loss of these abilities.