Petril 0.5 MG Tablet is a medicine that contains clonazepam. It is used to treat epilepsy, a neurological disorder in which brain activity becomes abnormal. It is also used in treating panic disorders like unexpected extreme fear and tension due to stress. Petril 0.5 MG Tablet works by increasing the activity of chemical messengers that helps in relaxing your brain and nerves. Petril 0.5 MG Tablet shows common side effects like fatigue, depression, memory impairment, confusion, dizziness ... Petril-MD 0.25 Tablet is a prescription medicine used to treat epilepsy (seizures) and anxiety disorder. It helps to decrease the abnormal and excessive activity of the nerve cells and calms the brain. Petril-MD 0.25 Tablet may be taken with or without food. Petril-MD 0.5 Tablet is a prescription medicine used to treat epilepsy (seizures) and anxiety disorder. It helps to decrease the abnormal and excessive activity of the nerve cells and calms the brain. Petril-MD 0.5 Tablet may be taken with or without food. Q. Is Petril-MD 0.5 Tablet a sleeping pill? Petril-MD 0.5 Tablet belongs to a class of medicines called benzodiazepines and is used to treat anxiety, stop seizures (fits) or relax tense muscles. This can also help relieve difficulty sleeping (insomnia), and is usually prescribed for a short period of time, if used to treat sleeping problems.