Kangxinan Bisoprolol Fumarate and Amlodipine Besilate Tablets

1. Indications and Usage
Hypertension: Indicated as an alternative treatment for hypertension in patients who are currently well-controlled on both bisoprolol and amlodipine.
2. Dosage and Administration
Recommended Dosage: The usual recommended dose is one tablet taken once daily.
Available Strengths: Common combinations include 5 mg bisoprolol fumarate and 5 mg amlodipine besylate, or 5 mg bisoprolol fumarate and 2.5 mg amlodipine besylate.
Administration Requirements: The tablets should be swallowed whole with water and can be taken with or without food.
Renal or Hepatic Impairment: No dose adjustment is typically required for mild to moderate impairment, but caution is advised in severe cases.
3. Mechanism of Action
Bisoprolol Component: A highly selective β1-adrenergic receptor blocker that reduces heart rate, myocardial contractility, and cardiac output, thereby lowering blood pressure.
Amlodipine Component: A dihydropyridine calcium channel blocker that inhibits the influx of calcium ions into vascular smooth muscle and cardiac muscle, leading to vasodilation and reduced peripheral vascular resistance.
Combined Effect: The combination provides complementary antihypertensive effects with a reduced risk of reflex tachycardia often seen with calcium channel blockers alone.
4. Safety and Warnings
Cardiac Conduction: Contraindicated in patients with severe bradycardia, second- or third-degree heart block, cardiogenic shock, or uncompensated heart failure.
Abrupt Withdrawal: Do not discontinue abruptly, especially in patients with ischemic heart disease, as this may cause rebound hypertension or angina.
Hepatic Impairment: Amlodipine clearance may be prolonged in hepatic impairment; clinical monitoring is necessary.
Pregnancy: Generally not recommended during the first trimester and contraindicated during the second and third trimesters.
5. Adverse Reactions and Clinical Research
Adverse Reactions: Common side effects include peripheral edema, flushing, headache, dizziness, fatigue, bradycardia, and nausea.
Clinical Research: Clinical trials have demonstrated that this fixed-dose combination effectively lowers blood pressure and improves treatment adherence compared to monotherapy in hypertensive patients.
6. Drug Interactions
CYP3A4 Inhibitors: Strong inhibitors (e.g., ketoconazole, itraconazole, ritonavir) may increase amlodipine exposure; dose reduction of amlodipine may be necessary.
Beta-Blockers and Calcium Channel Blockers: Concurrent use with other agents that slow heart rate or contractility (e.g., verapamil, diltiazem, digoxin) may lead to excessive bradycardia or heart failure.
Alpha-Blockers: Concomitant use with alpha-blockers may significantly increase hypotensive effects.
7. Pharmaceutical Information
Composition: Contains bisoprolol fumarate and amlodipine besylate as active ingredients.
Appearance: Typically white or off-white film-coated tablets.
Storage: Store at controlled room temperature, protecting from moisture and light.