Pronethalol is a beta-blocker medication used to treat conditions such as hypertension and arrhythmias. It is also known by its generic name, propranolol. Other synonyms for this medication include Inderal, InnoPran, Hemipralon, and Betachron. Pronethalol works by blocking the effects of adrenaline and other stress hormones, which can lower heart rate, blood pressure, and reduce the workload of the heart. It is commonly used to treat conditions such as angina, migraines, and stage fright. Despite its effectiveness, it is important to note that Pronethalol should only be taken under the direction of a healthcare professional, as its use can lead to side effects such as fatigue, dizziness, and decreased blood sugar levels.