Prescription ·Strong evidence ·Reviewed May 2026
Propranolol is a non-selective beta-blocker that blocks both beta-1 and beta-2 receptors. It was the first clinically useful beta-blocker and is used for hypertension, angina, arrhythmias, migraine prophylaxis, essential tremor, and performance anxiety. Its lipophilic nature allows CNS penetration.
The bottom line
Evidence rating strong. Most-documented uses: effective for rate control in arrhythmias, migraine prophylaxis, essential tremor control. 10 sources indexed (2016–2025), with 6 interaction records on file.
Core mechanism
Non-selectively blocks beta-1 and beta-2 adrenergic receptors. Beta-1 blockade reduces heart rate, contractility, and renin release. Beta-2 blockade can cause bronchospasm, peripheral vasoconstriction, and impair glycogenolysis. Also has membrane-stabilizing activity at higher doses. Lipophilic, crosses blood-brain barrier.
Food enhances bioavailability by reducing first-pass hepatic metabolism; take consistently with or without food
Nutrients this medication can lower over time, and what to replace.
Chronic beta-blocker therapy has been associated with lower tissue CoQ10 status and reduced mitochondrial electron transport support.
Propranolol suppresses nocturnal melatonin synthesis by blocking pineal beta-1 receptors. Melatonin supplementation can restore sleep quality in propranolol-treated patients.
Recommendation: Melatonin 0.5-3mg at bedtime may help with propranolol-induced insomnia. This is a well-documented effect of non-selective beta-blockers.
Propranolol is the strongest CoQ10-enzyme inhibitor among beta-blockers, which contributes to fatigue and exercise intolerance. CoQ10 supplementation restores mitochondrial enzyme activity and may help offset these side effects, with the bonus of modest blood-pressure lowering.
Recommendation: Consider CoQ10 100-200 mg/day with food if you experience fatigue, exercise intolerance, or muscle aches on propranolol. Monitor blood pressure since CoQ10 may produce a small additional drop.
Green tea extract contains caffeine, which propranolol blunts the cardiovascular response to, and vice versa. High-dose green tea extract can also modestly raise blood pressure acutely from caffeine while EGCG produces opposite chronic vasodilatory effects, giving an unpredictable net effect when stacked with propranolol.
Recommendation: Limit high-dose green tea extract supplements while on propranolol; modest dietary green tea is usually fine. If you take a concentrated extract, monitor blood pressure and heart rate when starting.
Both L-theanine and propranolol blunt the cardiovascular response to acute stress. The combination can produce slightly greater anxiolytic effects, which is desirable for patients using propranolol for performance anxiety or essential tremor, but may add to heart-rate suppression.
Recommendation: L-Theanine 100-400 mg combined with propranolol is generally well-tolerated and may augment anxiolytic benefit. Monitor heart rate and watch for excessive sedation when starting.
Garlic extract lowers blood pressure on its own and, in animal studies, has been shown to potentiate the antihypertensive and cardioprotective effects of propranolol. The combination can drop blood pressure below target in well-controlled patients.
Recommendation: If you take propranolol, monitor your blood pressure for several weeks after starting garlic extract. Have your prescriber re-evaluate your propranolol dose if readings consistently fall below target.
Ashwagandha lowers cortisol and dampens sympathetic activity, which can modestly reduce heart rate and blood pressure. Combined with propranolol, the effect can be additive, especially in patients using propranolol for anxiety, performance, or tremor.
Recommendation: Ashwagandha 300-600 mg/day is generally compatible with propranolol but check resting heart rate and blood pressure when starting. Reduce the dose if HR drops below 50 bpm or you become dizzy.
Numbered references. Citations throughout the page link here.
Biswas S, Toro M, Horgan R et al.. Propranolol to decrease time to delivery: a meta-analysis of randomized controlled trials. American journal of obstetrics & gynecology MFM. 2025
Huang X, Si W, Zou Z et al.. Efficacy and safety of oral propranolol and topical timolol in the treatment of infantile hemangioma: a meta-analysis and systematic review. Frontiers in pharmacology. 2024
Yang H, Hu DL, Shu Q et al.. Efficacy and adverse effects of oral propranolol in infantile hemangioma: a meta-analysis of comparative studies. World journal of pediatrics : WJP. 2019
Manzano-Nunez R, García-Perdomo HA, Ferrada P et al.. Safety and effectiveness of propranolol in severely burned patients: systematic review and meta-analysis. World journal of emergency surgery : WJES. 2017
Léaute-Labrèze C, Boccara O, Degrugillier-Chopinet C et al.. Safety of Oral Propranolol for the Treatment of Infantile Hemangioma: A Systematic Review. Pediatrics. 2016
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