Atrest 12.5 Tablet is used to treat Huntington's disease, a condition in which nerve cells in the brain breakdown over time, thus deteriorating the person’s physical and mental abilities. It also helps to relieve uncontrollable and jerky movements of the body. Atrest 12.5 Tablet should be taken with or without food. However, it is advised to take it at the same time each day as this helps to maintain a consistent level of medicine in the body. Take this in the dose and duration as advised by your doctor and if you have missed a dose, take it as soon as you remember. This medication mustn't be stopped suddenly without talking to your doctor as it may worsen your symptoms. However, discontinue this medicine immediately if you experience neuroleptic malignant syndrome, characterized by fever, muscle rigidity, and altered consciousness or seizures. Some common side effects of this medicine include nausea, insomnia(difficulty sleeping), anxiety, fatigue, akathisia (restlessness and inability to stay still), and depression. It also causes dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you. Inform your doctor if you develop any unusual changes in mood or behavior, new or worsening depression, or suicidal thoughts while taking this medicine.