What is propranolol used for?
Propranolol is a beta-blocker medicine used to treat several conditions, most notably those related to an overactive stress response and abnormal heart rhythm or heart rate. It works by blocking beta receptors, which slows the heart and reduces certain stress-related signals to the body.
Which conditions does propranolol treat most often?
Common uses include:
- High blood pressure (hypertension)
- Angina (chest pain caused by reduced blood flow to the heart)
- Certain abnormal heart rhythms (arrhythmias)
- Prevention of migraine headaches
- Tremor (especially some types of performance or action tremor)
- Anxiety-related symptoms that involve physical signs like shaking or a racing heart
- Some thyroid-related symptoms (when symptoms come from excess thyroid hormone)
Why do doctors prescribe it for migraines and tremor?
For migraines and tremor, propranolol is used to reduce the likelihood of episodes by stabilizing the body’s adrenergic (stress- and adrenaline-related) signaling. This can lower the frequency and severity of migraines and improve tremor symptoms.
What is it doing in the body when it works?
By blocking beta receptors, propranolol:
- Lowers heart rate and reduces the force of heart contractions
- Decreases the release/effect of adrenaline-like signaling
- Reduces overactive physiologic symptoms like palpitations, shaking, and anxiety-related tremulousness
What should patients watch for (especially if using it for anxiety or tremor)?
Because propranolol slows the heart and can lower blood pressure, people may notice dizziness, fatigue, or lightheadedness, particularly when standing. It can also worsen symptoms in some people with asthma or certain breathing problems, since beta-blockade may affect airways. People with diabetes should be aware it can mask some warning signs of low blood sugar.