Selbis (Bisoprolol Fumarate): A Selective Beta-1 Blocker

Selbis contains Bisoprolol Fumarate, a highly selective beta-1 adrenergic blocking agent. It is indicated for the treatment of hypertension (high blood pressure), angina, and moderate to severe heart failure. By selectively blocking beta-1 receptors, it helps to reduce heart rate and cardiac output, which leads to a decrease in arterial hypertension. Selbis is not intended for the emergency treatment of hypertensive crises. It belongs to the therapeutic class of beta-blockers.

How Selbis Works (Pharmacology)

Bisoprolol's mechanism of action is its high selectivity for beta-1 adrenergic receptors:

• Selective Beta-1 Blockade: It selectively blocks beta-1 adrenergic receptors primarily found in the heart and vascular smooth muscle.
• Reduces Heart Rate and Cardiac Output: By blocking these receptors, it reduces heart rate and cardiac output.
• Lowers Blood Pressure: This reduction in cardiac activity results in a decrease in arterial hypertension.
• No Adverse Lipid Effects: Unlike some non-selective beta-blockers, Bisoprolol does not cause adverse changes in cholesterol fractions.
• Pharmacokinetics: It is well-absorbed, with a high bioavailability, and has a long half-life of 10-12 hours, which makes it suitable for a once-daily dose.

Key Indications & Benefits

Selbis is indicated for:

• Hypertension (high blood pressure).
• Angina.
• Moderate to severe heart failure.

Dosage & Administration

The dosage of Selbis must be individualized to the patient's needs and is typically taken once daily. Always consult a registered physician for specific dosage instructions.

• Adults (Hypertension): The usual starting dose is 5 mg once daily. The dose can be increased to 10 mg and then, if necessary, to 20 mg once daily, with dose adjustments made at appropriate intervals of two weeks.
• Children: The safety and effectiveness in children have not been established.
• Renal or Hepatic Impairment: The initial daily dose should be 5 mg. Dose titration should be done with caution due to the possibility of drug accumulation.
• Elderly: Dose adjustment is not usually necessary unless there is significant renal or hepatic dysfunction.

Important Considerations & Warnings

It is crucial to discuss your full medical history with your doctor before taking Selbis.

Contraindications:

• Cardiogenic shock.
• Overt heart failure.
• Second or third-degree A-V block.
• Right ventricular failure secondary to pulmonary hypertension.
• Sinus bradycardia.

Side Effects:

• Common: Fatigue, dizziness, headache, nausea, vomiting, diarrhea, constipation, or abdominal pain.
• Less common: Cold or numb extremities, muscle weakness or cramps, and slow heart rate.
• Rare: Bronchospasm in people with asthma or COPD.

Pregnancy & Lactation:

• Pregnancy: There are no studies in pregnant women. It should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
• Lactation: Small amounts of Bisoprolol are detected in the milk of lactating rats. If the use of Selbis is considered essential, mothers should stop nursing.

Precautions & Warnings:

• Renal or Hepatic Impairment: Use with caution and monitor dose adjustments carefully.
• Allergies: Patients with a history of severe allergic reactions may be more reactive to allergens and may be unresponsive to the usual doses of epinephrine while taking beta-blockers.

Drug Interactions:

• Other Beta-Blockers: Should not be combined with other beta-blocking agents.
• Calcium Channel Blockers: Combined use with calcium channel blockers (especially verapamil and diltiazem) or antiarrhythmic agents can lead to severe hypotension, bradycardia, and cardiac failure.
• Catecholamine-Depleting Drugs: Patients should be monitored closely as the combination can produce an excessive reduction of sympathetic activity.
• Clonidine: Beta-blockers may worsen rebound hypertension that can occur after clonidine withdrawal. The beta-blocker should be withdrawn several days before discontinuing clonidine.

Storage Conditions

Keep in a dry place away from light and heat. Keep out of the reach of children.