What is the first-line drug for reducing portal hypertension?

Under normal circumstances, there is no specific first-choice medication for reducing portal hypertension. Drugs such as propranolol, carvedilol tablets, lisinopril tablets, irbesartan tablets, and roxithromycin can be used to alleviate symptoms. Specific details are as follows:

1. Propranolol

Propranolol is a special drug for lowering portal venous pressure and preventing variceal bleeding in humans. It strongly blocks β1 receptors, leading to slower heart rate and reduced cardiac output, thereby lowering blood pressure. It may also increase peripheral resistance and slightly reduce blood flow to the liver and kidneys, ultimately decreasing portal venous pressure.

2. Carvedilol Tablets

Carvedilol is a medication that acts on both beta and α1 receptors. It reduces portal hypertension and alleviates vasoconstriction caused by portal hypertension.

3. Lisinopril Tablets

Lisinopril is a long-acting angiotensin-converting enzyme (ACE) inhibitor. It lowers portal hypertension by dilating blood vessels and inhibiting the renin-angiotensin-aldosterone system. The effect starts slowly upon initial use but gradually strengthens, reaching maximum efficacy after 3–4 weeks.

4. Irbesartan Tablets

Irbesartan suppresses aldosterone release and vasoconstriction, thus lowering blood pressure. It is particularly effective for mild to moderate hypertension. As a commonly used antihypertensive drug, irbesartan inhibits aldosterone secretion and vascular constriction after administration.

5. Roxithromycin

Roxithromycin is a broad-spectrum antibiotic that reduces ammonia and toxic substances produced by intestinal bacteria, helping to lower portal hypertension.

In summary, medications for reducing portal hypertension should be used under the guidance of a physician. If any discomfort occurs, prompt medical consultation is recommended to avoid adverse outcomes.