Eyes Home > Timolol
What Should I Tell My Healthcare Provider?You should talk with your healthcare provider prior to taking timolol if you have:
- Heart failure
- A slow heart rate (bradycardia)
- Liver disease, such as liver failure, cirrhosis, or hepatitis
- Kidney disease, such as kidney failure (renal failure)
- A history of stroke or transient ischemic attack (TIA)
- Heart block
- Sick sinus syndrome
- Chronic obstructive pulmonary disease (COPD)
- An upcoming surgery
- Myasthenia gravis
- Any allergies, including allergies to foods, dyes, or preservatives.
- Pregnant or thinking of becoming pregnant (see Timolol and Pregnancy)
- Breastfeeding (see Timolol and Breastfeeding).
How Does It Work?Timolol belongs to a group of drugs called beta-adrenergic blocking agents, more often known as beta blockers. As the name implies, these medications block beta receptors in the body. Beta receptors are located in a number of places, including the eyes, heart, and blood vessels. Stress hormones such as adrenaline bind to these receptors and cause certain reactions in the body, such as:
- Increased heart rate
- Increased force with which the heart pumps blood
- Higher blood pressure (both systolic and diastolic blood pressure)
- Constricted blood vessels
- Increased eye pressure.