Glaucoma Drugs Notes in Pharmacology: Types of Glaucoma, Aqueous Humor Formation & Outflow, Classification of Anti-Glaucoma Drugs, Beta Blockers, Carbonic Anhydrase Inhibitors, Alpha-2 Agonists, Prostaglandin Analogues, Miotics, Osmotic Agents, Mechanism of Action, Side Effects, Uses

🌿 Glaucoma Drugs Notes in Pharmacology: Types of Glaucoma, Aqueous Humor Formation & Outflow, Classification of Anti-Glaucoma Drugs, Beta Blockers, Carbonic Anhydrase Inhibitors, Alpha-2 Agonists, Prostaglandin Analogues, Miotics, Osmotic Agents, Mechanism of Action, Side Effects, Uses

🌟 GLAUCOMA DRUGS –

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🎯 परिचय — Glaucoma क्या है?

🔹 Glaucoma एक chronic progressive eye disease है जिसमें optic nerve धीरे-धीरे damage होने लगती है।

🔹 Optic nerve eye से brain तक visual signals पहुँचाती है।

🔹 यदि optic nerve damage हो जाए तो vision loss होने लगता है।

🔹 Untreated glaucoma blindness तक पहुँचा सकता है।

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🚨 Glaucoma में Blindness क्यों होती है?

🔹 Eye के अंदर एक pressure होता है जिसे Intraocular Pressure (IOP) कहते हैं।

🔹 जब IOP बढ़ जाता है तो optic nerve पर लगातार pressure पड़ता है।

➡ इससे: ✔ Optic nerve fibers damage होते हैं ✔ Blood supply कम होती है ✔ Retinal ganglion cells मरने लगते हैं ✔ Vision धीरे-धीरे खत्म होने लगती है

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👁️ Aqueous Humor क्या है?

🔹 Aqueous Humor एक transparent watery fluid है जो eye के anterior chamber में पाया जाता है।

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📍 Aqueous Humor कहाँ बनता है?

✔ Ciliary body में

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📍 Functions of Aqueous Humor

✔ Cornea को nutrition देना ✔ Lens को oxygen देना ✔ Eye shape maintain करना ✔ Waste products हटाना ✔ IOP maintain करना

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🌊 Aqueous Humor Flow

✨ Step 1 — Formation

🔹 Ciliary body aqueous humor बनाती है।

✨ Step 2 — Movement

Posterior chamber → Pupil → Anterior chamber

✨ Step 3 — Drainage

1️⃣ Trabecular Meshwork Pathway Anterior chamber → Trabecular meshwork → Canal of Schlemm

2️⃣ Uveoscleral Pathway

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🚨 Glaucoma का Main Problem

🔴 Either: ✔ Aqueous humor ज्यादा बन रहा है

या

✔ Outflow कम हो रहा है

➡ Result = IOP increase

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🌟 Increased IOP Dangerous क्यों है?

🔹 Eye एक closed compartment है।

🔹 Fluid बढ़ने पर pressure बढ़ता है।

➡ यह pressure: ✔ Optic disc compress करता है ✔ Optic nerve ischemia करता है ✔ Nerve degeneration शुरू करता है

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🌟 TYPES OF GLAUCOMA

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1️⃣ Primary Open Angle Glaucoma (POAG)

📌 Most common type

🔹 Drainage angle open रहता है लेकिन trabecular drainage proper नहीं होती।

➡ Outflow resistance बढ़ जाती है।

📍 Features: ✔ Slow progression ✔ Painless ✔ Peripheral vision loss ✔ Tunnel vision

🚨 इसे “Silent Thief of Vision” कहते हैं क्योंकि शुरुआत में symptoms नहीं होते।

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2️⃣ Angle Closure Glaucoma

📌 Medical Emergency

🔹 Iris drainage angle को block कर देती है।

➡ Aqueous humor बाहर नहीं निकल पाता।

➡ IOP अचानक बहुत बढ़ जाता है।

📍 Symptoms: ✔ Severe eye pain ✔ Red eye ✔ Headache ✔ Vomiting ✔ Halos around lights ✔ Blurred vision

🚨 Emergency treatment जरूरी है क्योंकि optic nerve rapidly damage हो सकती है।

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3️⃣ Congenital Glaucoma

🔹 जन्मजात drainage defect

📍 Features: ✔ Enlarged eye ✔ Watering ✔ Photophobia

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4️⃣ Secondary Glaucoma

🔹 दूसरी diseases/drugs के कारण

📍 Causes: ✔ Steroids ✔ Diabetes ✔ Trauma ✔ Cataract ✔ Uveitis

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🌟 ANTI-GLAUCOMA DRUGS KA MAIN AIM

🔴 Aqueous humor formation कम करना

या

🟢 Aqueous humor outflow बढ़ाना

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🧠 MASTER TRICK

✨ “BCA बंद करे Factory”

🔹 B = Beta blockers 🔹 C = Carbonic anhydrase inhibitors 🔹 A = Alpha-2 agonists

➡ Production कम करते हैं

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✨ “PMR Pushes Moisture Route”

🔹 P = Prostaglandins 🔹 M = Miotics 🔹 R = Rho kinase inhibitors

➡ Outflow बढ़ाते हैं

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🌟 1️⃣ BETA BLOCKERS

📍 Drugs: ✔ Timolol ✔ Betaxolol ✔ Levobunolol ✔ Carteolol

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⚙️ Mechanism

🔹 Ciliary epithelium में β receptors block करते हैं।

➡ Aqueous humor secretion कम होती है ➡ IOP कम होता है

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🌟 Timolol

📌 Most important drug

🔹 Non-selective β blocker

📍 Uses: ✔ Chronic open-angle glaucoma

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🚨 Side Effects

✔ Burning ✔ Dry eye ✔ Bradycardia ✔ Bronchospasm

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🚨 Asthma में contraindicated क्यों?

🔹 β2 receptors bronchodilation करते हैं।

🔹 Timolol इन्हें block कर देता है।

➡ Bronchoconstriction हो सकती है।

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🌟 Betaxolol

🔹 β1 selective blocker

➡ Asthma patients में safer

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🌟 2️⃣ CARBONIC ANHYDRASE INHIBITORS (CAI)

📍 Drugs: ✔ Acetazolamide ✔ Methazolamide ✔ Dorzolamide ✔ Brinzolamide

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⚙️ Mechanism

🔹 Carbonic anhydrase enzyme bicarbonate formation कराता है।

🔹 CA inhibitors enzyme को inhibit करते हैं।

➡ Bicarbonate formation कम ➡ Sodium transport कम ➡ Water transport कम ➡ Aqueous humor formation कम

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🌟 Acetazolamide

📌 Oral/IV drug

✔ Acute glaucoma में useful

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🚨 Side Effects

✔ Metabolic acidosis ✔ Hypokalemia ✔ Renal stones ✔ Paresthesia

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🚨 Metabolic acidosis क्यों होती है?

🔹 Kidney से bicarbonate loss बढ़ जाता है।

➡ Body acidic हो जाती है।

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🌟 Dorzolamide

✔ Topical CA inhibitor ✔ Systemic toxicity कम

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🌟 3️⃣ ALPHA-2 AGONISTS

📍 Drugs: ✔ Brimonidine ✔ Apraclonidine

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⚙️ Mechanism

🔹 α2 receptor stimulation

➡ Aqueous secretion कम ➡ Uveoscleral outflow बढ़ता है

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🌟 Dual Action Drugs

✔ Production कम ✔ Outflow बढ़ाते हैं

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🚨 Side Effects

✔ Dry mouth ✔ Fatigue ✔ Allergy

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🌟 4️⃣ PROSTAGLANDIN ANALOGUES

📍 First line drugs

✔ Latanoprost ✔ Travoprost ✔ Bimatoprost ✔ Tafluprost

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⚙️ Mechanism

🔹 Uveoscleral pathway को widen करते हैं।

➡ Fluid आसानी से बाहर निकलता है ➡ IOP significantly कम होता है

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🌟 First line क्यों?

✔ Most effective ✔ Once daily dosing ✔ Compliance अच्छा ✔ Systemic toxicity कम

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🌟 Latanoprost

📌 Most commonly used prostaglandin analogue

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🚨 Side Effects

✔ Iris pigmentation बढ़ती है ✔ Eyelash growth बढ़ती है ✔ Redness

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🚨 Eyelash growth क्यों?

🔹 Hair follicles stimulate होते हैं।

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🌟 5️⃣ CHOLINERGIC DRUGS (MIOTICS)

📍 Drugs: ✔ Pilocarpine ✔ Carbachol

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⚙️ Mechanism

🔹 Muscarinic receptor stimulation

➡ Miosis ➡ Trabecular meshwork खुलता है ➡ Drainage बढ़ती है ➡ IOP कम होता है

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🌟 Pilocarpine

📌 Direct acting muscarinic agonist

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🚨 Side Effects

✔ Brow pain ✔ Blurred vision ✔ Night vision difficulty

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🚨 Night vision खराब क्यों?

🔹 Miosis के कारण darkness में light entry कम हो जाती है।

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🌟 6️⃣ RHO KINASE INHIBITORS

📍 Drug: ✔ Netarsudil

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⚙️ Mechanism

🔹 Trabecular meshwork relaxation

➡ Outflow resistance कम ➡ Drainage बढ़ती है

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🌟 7️⃣ OSMOTIC AGENTS

📍 Drugs: ✔ Mannitol ✔ Glycerol

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⚙️ Mechanism

🔹 Blood osmolarity बढ़ाते हैं।

➡ Water eye से blood में shift होता है ➡ Vitreous volume कम होता है ➡ IOP rapidly decrease

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🌟 Mannitol

📌 IV emergency drug

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🚨 Side Effects

✔ Pulmonary edema ✔ Dehydration

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🚨 Pulmonary edema क्यों?

🔹 Blood volume temporarily बढ़ जाता है।

➡ Heart failure patients में fluid overload हो सकता है।

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🌟 ACUTE ANGLE CLOSURE GLAUCOMA DRUGS

✔ Mannitol ✔ Acetazolamide ✔ Timolol ✔ Pilocarpine

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🌟 Combination क्यों देते हैं?

✔ Mannitol → Rapid pressure reduction ✔ Acetazolamide → Formation कम ✔ Timolol → Further secretion कम ✔ Pilocarpine → Outflow बढ़ाता है

➡ Multiple mechanisms simultaneously काम करते हैं

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🌟 Eye Drops ज्यादा क्यों use होते हैं?

✔ Direct eye delivery ✔ Rapid effect ✔ Local action ✔ Systemic side effects कम

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🌟 HIGH YIELD POINTS

✔ Prostaglandin analogues = First line drugs ✔ Timolol = Most common beta blocker ✔ Acetazolamide = Acute glaucoma drug ✔ Pilocarpine = Causes miosis ✔ Mannitol = Emergency pressure reduction ✔ Brimonidine = Dual action drug

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🧠 HIGH YIELD MNEMONICS

✨ “BCA बंद करे पानी”

🔹 B = Beta blockers 🔹 C = Carbonic anhydrase inhibitors 🔹 A = Alpha-2 agonists

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✨ “PMR बाहर निकाले पानी”

🔹 P = Prostaglandins 🔹 M = Miotics 🔹 R = Rho kinase inhibitors

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✨ “MAPT बचाए Eye”

🔹 M = Mannitol 🔹 A = Acetazolamide 🔹 P = Pilocarpine 🔹 T = Timolol

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🎯 FINAL RAPID REVISION

✔ Timolol → β blockade → Aqueous formation कम

✔ Acetazolamide → Carbonic anhydrase inhibition → Secretion कम

✔ Brimonidine → α2 stimulation → Secretion कम + Outflow बढ़े

✔ Latanoprost → Uveoscleral outflow बढ़े

✔ Pilocarpine → Miosis → Trabecular drainage बढ़े

✔ Mannitol → Osmotic dehydration → Rapid IOP reduction