Rivotril improves the effectiveness of gamma-aminobutyric acid (GABA), which is a relaxing chemical that is found in the brain. In addition, raising GABA activity slows brain functions and lessens feelings of tension and anxiety. Additionally, it helps manage the physical signs of anxiety, such as anxiety, agitation, rapid breathing and a higher heart rate. The medicine usually kicks in after 30-60 minutes and lasts up to 12 hours, based on the metabolism of each individual and the dosage.