How can hypertension medications aid in scientific weight loss? Analysis of medication selection and effects.

Drug Therapy:

Human blood pressure is affected by many factors. Any disruption to any part or link in the blood pressure regulation system can cause changes in blood pressure. Antihypertensive drugs work by acting on one or more parts of the blood pressure regulation system. Based on their primary site of action, antihypertensive drugs are classified as diuretics, sympathetic nerve inhibitors, angiotensin-converting enzyme inhibitors, calcium channel blockers, and vasodilators.

Calcium Channel Blockers:

1. Pharmacological Action: Calcium channel blockers inhibit the transmembrane influx of extracellular Ca²⁺ by blocking calcium channels, reducing intracellular Ca²⁺ ionization, thereby relaxing vascular smooth muscle, dilating small arteries, and reducing peripheral resistance.

2. Drug Use and Antihypertensive Application: Nifedipine (Adalat): Oral administration, 5–20 mg once, 2–3 times daily; sublingual administration of 10 mg can achieve maximum antihypertensive effect within 3–5 minutes. The main adverse reactions of Adalat are reflex tachycardia, facial flushing, and ankle edema.

Verapamil: Oral administration, 40-120 mg three times daily.

Verapamil sustained-release formulation: Oral administration, 120-240 mg once daily. This drug has a slow but long-lasting antihypertensive effect and few adverse reactions, but it can inhibit the conduction system and cause constipation.

Amlodipine (Amlodipine) and Felodopne (Felodopne): Both are novel Ca²+ antagonists. Oral administration, 5-10 mg once daily, has a good antihypertensive effect with few adverse reactions.

Vasodilators:

1. Hydralazine: Pharmacological action: Hydralazine can enter vascular smooth muscle cells and cause vasodilation. It mainly acts on arterioles, producing widespread vasodilation and selectively reducing vascular resistance in cerebral arteries, coronary arteries, and renal arteries.

1. Antihypertensive Use:Oral administration of 10-25 mg three times daily. Generally not used alone; can be used in combination with beta-blockers or diuretics. Long-term use may lead to lupus-like symptoms and rheumatoid arthritis.

2. Sodium Nitroprusside:Pharmacological Action: When sodium nitroprusside comes into contact with vascular endothelial cells and erythrocytes, its molecules decompose, releasing NO, leading to vasodilation.

Antihypertensive Use: Intravenous infusion of 1 mg/(kg·min) for hypertensive crises or heart failure. Common adverse reactions include vomiting, sweating, restlessness, and palpitations, mostly due to a reduced effect caused by excessively rapid infusion.

3. Indapamide (Sodium-based):Pharmacological Action: Primarily inhibits calcium ion influx into vascular smooth muscle, reducing intracellular calcium ions. It also induces EDRF in vascular endothelial cells, leading to vasodilation, and has a mild diuretic effect. Indapamide has calcium antagonistic and cardioprotective effects, with a mild and effective antihypertensive effect.

Antihypertensive Use: Oral administration, 2.5–5 mg once daily.

4. Urapidil (Urapidil)

Pharmacological Action: Urapidil has a dual mechanism of action for lowering blood pressure, both peripherally and centrally. Peripheral vasodilation is mainly achieved by blocking postsynaptic β-receptors, reducing peripheral resistance and thus lowering blood pressure. Central effects are mainly achieved by stimulating serotonin receptors, reducing sympathetic feedback regulation in the cardiovascular center.

Antihypertensive Use: Oral administration, 30–60 mg once or twice daily; intravenous administration, initial bolus 25 mg. Primarily used for controlled hypotension in various hypertensive emergencies and during surgery.