Petril Beta-10 Tablet is used to treat anxiety. Besides this, it is also used to treat high blood pressure, panic disorder, seizure disorder, fast heartbeat, and migraine. It contains two medicines, namely Clonazepam and Propranolol. It may cause common side effects, such as dry mouth, slow heart rate, depression, fatigue (overtiredness), nightmares, sleep disturbances, memory impairment, and confusion. View Uses, Benefits, and Price of Petril Beta-10 Tablet at Apollo Pharmacy. Know Petril Beta 10mg Tablet 10'S uses, side-effects, price, substitutes, drug interactions, precautions, warnings, expert advice and more on Netmeds. Petril Beta is a combination of clonazepam and propranolol used to treat anxiety disorder. Learn about its uses, side effects, reviews, composition, expert advice and precautions on 1mg. It is a habit-forming drug. This drug contains clonazepam along with propranolol as its top comb. inations. It can also control seizures, chest pain due to angina, cardiac arrhythmias etc. This drug has a calming effect on brain cells.