What medications can be taken to prevent fainting?

Generally, medications such as Midodrine Hydrochloride Tablets, Norepinephrine Bitartrate Injection, Shengmai Oral Liquid (Radix Ginseng and Ophiopogon Root Liquid), Shenmai Injection, and Atropine Sulfate Tablets may be used under medical guidance to prevent fainting. Detailed explanations are as follows:

1. Midodrine Hydrochloride Tablets

Midodrine hydrochloride tablets are α1-adrenergic receptor agonists that selectively activate peripheral vascular α1 receptors, causing constriction of small arteries and veins, increasing peripheral vascular resistance, and thereby raising blood pressure. For fainting caused by orthostatic hypotension, this medication can stabilize blood pressure fluctuations during postural changes, reducing the risk of fainting caused by sudden drops in blood pressure leading to insufficient cerebral perfusion.

2. Norepinephrine Bitartrate Injection

Norepinephrine bitartrate injection is a potent vasoconstrictor that activates α-adrenergic receptors, strongly constricting systemic small arteries and veins, elevating both systolic and diastolic blood pressure. It is suitable for preventing fainting caused by severe hypotension, maintaining stable blood pressure levels to ensure adequate blood supply to the brain and vital organs, thus preventing fainting episodes.

3. Shengmai Oral Liquid

Shengmai oral liquid consists of ginseng, ophiopogon root, and schisandra fruit. It functions to replenish vital energy, restore pulse, nourish yin, and promote body fluid production. In traditional Chinese medicine, fainting is associated with deficiency of both qi and yin and impaired nourishment of the heart vessels. This medication can supplement qi and yin, enhance cardiac function, improve systemic circulation, increase cerebral blood supply, and thereby prevent dizziness and fatigue caused by insufficiency of qi and yin, reducing the likelihood of fainting.

4. Shenmai Injection

Shenmai injection mainly contains red ginseng and ophiopogon root. It functions to replenish qi and consolidate the body's vital essence, nourish yin, and promote body fluid production. It is indicated for shock and hypotension caused by deficiency of both qi and yin. This medication enhances myocardial contractility, improves microcirculation, increases blood pressure and tissue perfusion, and provides sufficient blood supply to the brain, thereby reducing the likelihood of fainting due to circulatory failure, especially suitable for individuals with weak constitutions to prevent fainting.

5. Atropine Sulfate Tablets

Atropine sulfate tablets belong to anticholinergic drugs that block M-cholinergic receptors, relieve vagal nerve inhibition of the heart, accelerate heart rate, and improve cardiac conduction function. For fainting caused by bradycardia-induced reduction in cardiac output and insufficient cerebral perfusion, this medication can increase heart rate, enhance cardiac output, ensure adequate cerebral blood supply, and thus prevent fainting.

In daily life, it is important to develop good habits, such as avoiding sudden standing to reduce the occurrence of orthostatic hypotension; maintaining regular作息 (作息 should be translated as "rest and activity schedules") and avoiding excessive fatigue; eating a balanced diet, appropriately supplementing salt and water to maintain normal blood pressure. If frequent symptoms such as dizziness and visual darkening (precursors of fainting) occur, timely medical consultation is necessary to identify the underlying cause and follow medical advice for medication to prevent fainting.