Product Information

Registration Status: Active

BLOKBIS TABLET 2.5MG is approved to be sold in Singapore with effective from 2019-09-12. It is marketed by DRUG HOUSES OF AUSTRALIA PTE LTD, with the registration number of SIN15804P.

This product contains Bisoprolol 2.5 mg in the form of TABLET. It is approved for ORAL use.

This product is manufactured by Chanelle Medical in IRELAND.

It is a Prescription Only Medicine that can only be obtained from a doctor or a dentist, or a pharmacist with a prescription from a Singapore-registered doctor or dentist.



Bisoprolol is a cardioselective β1-adrenergic blocking agent used for secondary prevention of myocardial infarction (MI), heart failure, angina pectoris and mild to moderate hypertension. Bisoprolol is structurally similar to metoprolol, acebutolol and atenolol in that it has two substituents in the para position of the benzene ring. The β1-selectivity of these agents is thought to be due in part to the large substituents in the para position. At lower doses (less than 20 mg daily), bisoprolol selectively blocks cardiac β1-adrenergic receptors with little activity against β2-adrenergic receptors of the lungs and vascular smooth muscle. Receptor selectivity decreases with daily doses of 20 mg or greater. Unlike propranolol and pindolol, bisoprolol does not exhibit membrane-stabilizing or sympathomimetic activity. Bisoprolol possesses a single chiral centre and is administered as a racemic mixture. Only l-bisoprolol exhibits significant β-blocking activity.


For management of heart failure, angina pectoris, and mild to moderate hypertension and for secondary prevention of myocardial infarction (MI).

Mechanism of Action

Bisoprolol selectively blocks catecholamine stimulation of β1-adrenergic receptors in the heart and vascular smooth muscle. This results in a reduction of heart rate, cardiac output, systolic and diastolic blood pressure, and possibly reflex orthostatic hypotension. At higher doses (e.g. 20 mg and greater) bisoprolol may competitively block β2-adrenergic receptors in bronchial and vascular smooth muscle causing bronchospasm and vasodilation.


Well absorbed. Bioavailability > 80%. Absorption is not affected by food. Peak plasma concentrations occur within 2-4 hours.
Approximately 50% of the dose is metabolized primarily metabolized by CYP3A4 to inactive metabolites. In vitro studies have shown that bisoprolol is also metabolized by CYP2D6 though this does not appear to be clinically significant. Approximately half the administered dose is excreted in unchanged in urine.


Oral, mouse: LD50 = 100 mg/kg; Skin, rabbit: LD50 = 200 mg/kg; Skin, rat: LD50 = 500 mg/kg. Symptoms of overdose include congestive heart failure (marked by sudden weight gain, swelling of the legs, feet, and ankles, fatigue, and shortness of breath), difficult or labored breathing, low blood pressure, low blood sugar, and slow heartbeat.

Active Ingredient/Synonyms

(+-)-1-((alpha-(2-Isopropoxyethoxy)-P-tolyl)oxy)-3-(isopropylamino)-2-propanol | (RS)-1-(4-(2-isopropoxyethoxymethyl)phenoxy)-3-(isopropylamino)-2-propanol | Bisoprolol | Bisoprololum | Bisoprolol |

Source of information: Drugbank (External Link). Last updated on: 3rd July 18. *Trade Name used in the content below may not be the same as the HSA-registered product.


  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank