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Propranolol is one of the first beta blockers and — unlike bisoprolol or metoprolol — it blocks not only the beta-1 receptors in the heart but also the beta-2 receptors in the airways, blood vessels and metabolism. That makes it versatile: migraine prophylaxis, essential tremor, physical symptoms of anxiety. But it also makes it risky in asthma, in diabetes with episodes of low blood sugar and when it is stopped abruptly.
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Propranolol is broken down in the liver by several enzymes and acts on the heart, blood vessels, airways and metabolism. The range of interactions is correspondingly broad.¹
| Combination | Consequence | What to do |
|---|---|---|
| Calcium channel blockers of the verapamil or diltiazem type, other antiarrhythmics | Very slow pulse, conduction disorders, drop in blood pressure | Only under close monitoring; giving them into a vein is contraindicated |
| Insulin and blood-sugar-lowering tablets | Episodes of low blood sugar are more severe and last longer; warning signs such as palpitations and trembling are masked | Measure blood sugar more often, pay attention to sweating as a warning sign |
| Beta-2 sympathomimetics such as salbutamol | They cancel out each other's effect | Propranolol is contraindicated in asthma anyway |
| Clonidine | Markedly slowed pulse; an overshooting rise in blood pressure when clonidine is stopped | When ending treatment, stop propranolol first, then taper clonidine a few days later |
| Other blood pressure medicines, nitrates, tricyclic antidepressants | Increased drop in blood pressure | Stand up slowly, check blood pressure |
| Rizatriptan (migraine medicine) | Propranolol raises rizatriptan levels considerably | According to the SmPC, use the lower strength of rizatriptan |
| Anti-inflammatory painkillers such as indometacin | Weaker lowering of blood pressure | Discuss long-term use with the practice |
| Adrenaline (emergency pen, some anaesthetics) | Sharp rise in blood pressure, adrenaline works less well | Tell your dentist and the emergency team that you take propranolol |
| MAO inhibitors (except MAO-B inhibitors) | A dangerous rise in blood pressure is possible | Contraindicated |
| Cimetidine; rifampicin | Cimetidine raises, rifampicin lowers propranolol levels | Have a dose adjustment checked |
| Alcohol | Increased drop in blood pressure, impaired reactions | Go easy, especially at the start of treatment |
Two combinations deserve particular attention. The first is with blood-sugar-lowering medicines: on propranolol, the familiar alarm signals of low blood sugar are missing, and the liver releases sugar more slowly. After long periods of fasting or strenuous physical exertion, low blood sugar can occur even without diabetes.¹ The second is the double beta blocker: if you get propranolol for migraine from a specialist practice and another beta blocker for high blood pressure from your GP practice, you may be taking two active ingredients from the same group. This is exactly what an interaction check across your whole list is for.
Before operations under general anaesthesia, the anaesthesia team needs to know that you take propranolol — as a rule it is not stopped for this, but deliberately continued or adjusted according to plan.
According to the guideline, propranolol is one of the migraine preventives with a high level of evidence, together with metoprolol, flunarizine, topiramate and amitriptyline. The guideline cites a meta-analysis in which propranolol reduced headache days in episodic migraine by an average of about 1.5 days a month compared with placebo.² That sounds modest — and it is honest: prophylaxis rarely makes you migraine-free; it makes the attacks less frequent and often milder. It is usually considered a success if the number of migraine days roughly halves. If you used to have ten migraine days and now have six, that is a real gain, even if it does not feel like one.
Whether propranolol or another preventive suits you depends on any other conditions: with asthma it is ruled out, with low blood pressure it is unfavourable, and with high blood pressure or a racing heart it can be doubly useful. The guideline recommends reviewing the effect after three months and making an attempt at stopping after 9 to 12 months.²
In essential tremor — a hereditary trembling of the hands that is particularly troublesome when holding and reaching for things — propranolol is, according to the guideline, a first-choice medicine alongside primidone.³ Many people benefit noticeably, but the trembling is rarely eliminated completely. Side effects and contraindications often limit its use more than its effect does. If medicines are not enough, specialised procedures come into question.
Propranolol dampens palpitations, trembling and a shaky voice — but not brooding, catastrophic thinking or the fear of fear. For people with occasional stage fright, that may be enough. For anxiety disorders, the situation is clear: the S3 guideline found no efficacy for beta blockers in double-blind studies and describes them as obsolete in the treatment of anxiety.⁴ What works there is psychotherapy, especially cognitive behavioural therapy, and certain antidepressants.
| Active ingredient | Selectivity | Strength | Typical drawback |
|---|---|---|---|
| Propranolol | Non-selective, passes easily into the brain | Migraine, tremor, physical symptoms of anxiety | Asthma contraindication, tiredness, cold hands, masked low blood sugar |
| Metoprolol | Preferentially beta-1 | Similarly effective in migraine prophylaxis, heart failure (as succinate) | Breakdown via CYP2D6 varies from person to person |
| Bisoprolol | Highly beta-1-selective | Heart failure, high blood pressure, atrial fibrillation | Less well studied for migraine, not established for tremor |
Yes, though in a different way from long-term treatment. The rebound risk mainly concerns regular use over weeks; an occasional single dose is not tapered off. The contraindications apply just the same, though: asthma, a slow pulse, low blood pressure or a severe allergy also speak against a one-off tablet. And, honestly speaking: if the tablet becomes necessary before every meeting, it is worth talking about the anxiety itself — not just about its symptoms.
This is a known side effect, because propranolol reaches the brain easily. Sometimes taking the last dose of the day earlier helps; sometimes the effect wears off after a few weeks. If it persists, a beta blocker that passes less easily into the brain or a different preventive is an option. Do not leave it out on your own — tapering applies in migraine prophylaxis too. Note down your sleep quality and dreams for a few weeks; that makes the conversation concrete.
That depends on what "a little" means in numbers. Many people underestimate the effect because they remember the bad days and not the ones that never happened. Compare your migraine days before starting with the last four weeks — after at least three months at the target dose. If little has changed, switching to another preventive makes more sense than increasing the dose endlessly. If you take acute medicines very often, you can also develop a medication-overuse headache, which no prophylaxis can beat on its own.
This must be clarified by a doctor before you take the first tablet. Asthma that has been quiet for decades can flare up again on a non-selective beta blocker. A cardioselective beta blocker or an entirely different medicine is often the safer solution. Also mention hay fever with breathing problems, exercise-induced asthma or a reliever spray lying in a drawer.
The interaction check reviews your whole list, including eye drops and as-needed medicines.
