Tertatolol is primarily used in the field of pharmacology as a beta-blocker. It is effective in managing hypertension by blocking the action of certain natural chemicals in the body, such as epinephrine, on the heart and blood vessels. This helps in lowering the heart rate, blood pressure, and strain on the heart. Additionally, tertatolol has been studied for its potential use in treating glaucoma, as it can reduce intraocular pressure by decreasing the production of aqueous humor in the eye. Its non-selective beta-blocking properties make it useful in various cardiovascular conditions, although its application is often limited due to the availability of more selective and safer alternatives.