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Pharmacology · Drugs Acting on Adrenergic Synapses

Bisoprolol

*Bisoprololum*

Bisoprolol is a lipophilic beta-blocker with high cardioselectivity. In clinical practice, it is widely used to treat hypertension, stable angina pectoris, and chronic heart failure.

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SelectivityBlocks β1 receptors 75 times more potently than β2 receptors (selectivity ratio of 75).
BioavailabilityReaches approximately 90% due to good absorption and the absence of a first-pass effect.
Half-lifeIs 10–12 hours, allowing once-daily administration.
CNS effectsThe lipophilicity of the molecule accounts for potential adverse neurological effects.
3 min readFor medical studentsUpdated 09/24/2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Pharmacodynamics and receptor profile

A key feature of bisoprolol is its high cardioselectivity. Its cardioselectivity index is 75. This means it blocks $\beta_1$-adrenergic receptors (primarily located in the heart) 75 times more strongly than $\beta_2$-adrenergic receptors.

However, clinical pharmacology has an important rule applicable to this agent: cardioselectivity is not absolute. As the prescribed dose increases, the selectivity of the drug decreases, and it begins to block not only the target $\beta_1$ receptors but also $\beta_2$ receptors.

Pharmacokinetics: absorption and distribution

In terms of physicochemical properties, bisoprolol is a lipophilic substance. This characteristic largely determines its fate in the body:

  • Absorption: The drug is readily absorbed from the gastrointestinal tract when taken orally.
  • Bioavailability: Reaches high values (approximately 90%).
  • First-pass effect: Unlike many other drugs, bisoprolol undergoes virtually no metabolism during its initial passage through the liver, which ensures its high systemic bioavailability.
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Metabolism, elimination, and dosing regimen

The drug is characterized by balanced clearance. This means that its elimination from the body occurs equally via two pathways: hepatic metabolism and renal excretion.

The elimination process has the following features:

  1. Carried out predominantly by the kidneys.
  2. Exactly 50% of the administered dose is excreted unchanged.
  3. The remaining portion is eliminated as inactive metabolites.

The pharmacokinetic time parameters are very convenient for patients. The half-life ($T_{1/2}$) ranges from 10 to 12 hours. This maintains a stable therapeutic regimen—the drug is prescribed once daily, and absorption efficiency is completely independent of food intake.

Indications and adverse reactions

In medical practice, bisoprolol is prescribed for the following cardiovascular conditions:

  • Arterial hypertension.
  • Stable angina pectoris.
  • Chronic heart failure (CHF) — used as part of combination therapy for mild-to-moderate disease severity.

Regarding adverse effects, special attention should be paid to the central nervous system. Because bisoprolol is a lipophilic compound, it can cross biological barriers into brain tissue, which may lead to central nervous system adverse effects.

How to memorize

Remember the "50/50" rule: bisoprolol has a balanced clearance—exactly 50% is excreted unchanged by the kidneys, and the remaining 50% is metabolized into inactive compounds.

Class and exam questions

Does the cardioselectivity of bisoprolol depend on the dose taken?

Yes, cardioselectivity is dose-dependent. When high doses are administered, selectivity is lost, and the drug begins to block β2 receptors.

Why can bisoprolol cause central nervous system side effects?

This is due to the pharmacokinetics of the drug: bisoprolol is a lipophilic substance, so it is able to cross the blood-brain barrier and affect the central nervous system.

How often should the drug be taken, and does it depend on food intake?

The elimination half-life (10–12 hours) allows the drug to be taken once daily. Food intake does not affect its absorption and bioavailability.

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What else to study on this topic

  • Mechanisms of central adverse effects in lipophilic drugs
  • Principles of combination therapy for moderate chronic heart failure
  • Balanced clearance: clinical significance in liver and kidney pathologies
  • Clinical consequences of losing cardioselectivity with increasing beta-blocker doses

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Other topics in the section "Drugs Acting on Adrenergic Synapses"

Agents acting on adrenergic synapsesPhenylephrineAlpha-2 adrenergic agonistsBeta-1 adrenergic agonistsBeta-2 adrenergic agonistsIsoprenalineNorepinephrineAdrenalineEphedrineNon-selective alpha-blockersHydrogenated ergot alkaloidsAlpha-1 blockersBeta-blockersPropranololNadololTimololBeta-blockers with intrinsic sympathomimetic activityCardioselective beta-blockersMetoprololAtenololBetaxololNebivololCarvedilolPropxodolol
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