5. Sympathoplegic Ganglion blockers: CVS Pharmcology

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5. Sympathoplegic Ganglion blockers: CVS Pharmacology
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Sympathoplegic ganglion blockers are a class of drugs that inhibit autonomic ganglionic transmission 🚫⚡, leading to widespread vasodilation 🩸, reduced cardiac output 💓, and decreased blood pressure 🩺. These drugs work by blocking nicotinic (Nn) receptors 🧬 in the sympathetic and parasympathetic ganglia, effectively cutting off the sympathetic nervous system's ability to constrict blood vessels and increase heart rate.

🔹 Examples of Ganglion Blockers:

Hexamethonium 🚦 – The first orally available antihypertensive, but now obsolete due to severe side effects.
Trimethaphan 💊 – A short-acting ganglion blocker used in hypertensive crises 🚨 and aortic dissection due to its ability to rapidly lower blood pressure.
Mecamylamine 🛑 – Occasionally used in research and treatment-resistant hypertension.
🔹 Mechanism of Action 🧠:
These drugs competitively block acetylcholine (ACh) binding to nicotinic receptors in autonomic ganglia, preventing sympathetic activation. As a result:

Blood vessels dilate 🏞️ → Lower blood pressure (Hypotension 🩸).
Heart rate slows ❤️ (bradycardia or tachycardia depending on vagal tone).
Reduced GI motility 🍔➡️🚫, causing constipation.
Urinary retention 🚽 due to loss of autonomic control.
🔹 Clinical Use & Limitations ⚠️:
Once used for severe hypertension, ganglion blockers are now rarely used due to severe side effects, including orthostatic hypotension, blurred vision 👀, dry mouth, and severe GI issues. Their non-selective action leads to both sympathetic and parasympathetic blockade, making them unpredictable.

Although outdated in clinical practice, ganglion blockers paved the way for modern antihypertensives and remain important in pharmacology history. 🌿✨

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