💊 NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)

🔹 Introduction

👉 NSAIDs ऐसी drugs हैं जो:

✔️ Pain (दर्द) कम करती हैं
✔️ Fever (बुखार) कम करती हैं
✔️ Inflammation (सूजन) कम करती हैं

👉 इन्हें Non-Steroidal इसलिए कहा जाता है क्योंकि ये steroid drugs नहीं होतीं, लेकिन anti-inflammatory action देती हैं।

👉 NSAIDs दुनिया की सबसे ज्यादा use होने वाली medicines में से हैं।

📌 Examples

Aspirin
Ibuprofen
Diclofenac
Paracetamol
Naproxen
Celecoxib

🔥 Inflammation क्या है?

👉 जब body में injury, infection, allergy या tissue damage होता है तब body defense response शुरू करती है जिसे inflammation कहते हैं।

✨ Signs of Inflammation

🔴 Redness
🔥 Heat
💥 Pain
💧 Swelling
❌ Loss of function

⚙️ Pain और Inflammation क्यों होती है?

👉 Injury होने पर cell membrane से Arachidonic Acid निकलता है।

👉 यह COX enzyme की मदद से prostaglandins बनाता है।

🧪 Prostaglandins क्या करते हैं?

⚡ Pain बढ़ाते हैं
🔥 Fever बढ़ाते हैं
💧 Swelling बढ़ाते हैं
🔴 Redness पैदा करते हैं

👉 इसलिए prostaglandins inflammation के main mediators हैं।

⚡ NSAIDs कैसे काम करती हैं?

👉 NSAIDs COX enzyme को inhibit करती हैं।

👉 जब prostaglandins कम बनते हैं:

✔️ Pain कम होता है
✔️ Fever कम होता है
✔️ Swelling कम होती है

🧬 COX Enzymes

🔹 COX-1

👉 यह protective enzyme है।

📌 Functions

🛡️ Stomach protection
🩸 Platelet function
💧 Kidney blood flow maintain करना

🔹 COX-2

👉 यह inflammatory enzyme है।

📌 Functions

💥 Pain
🔥 Fever
💧 Swelling

⚠️ COX-1 inhibition dangerous क्यों?

👉 COX-1 stomach को acid से बचाता है।

👉 NSAIDs जब COX-1 block करती हैं:

❌ Protective mucus कम बनता है
❌ Acid damage बढ़ता है

📌 Result

Gastritis
Ulcer
Bleeding

🎯 NSAIDs के Actions

💥 1. Analgesic Action

👉 Pain receptors की sensitivity कम होती है।

📌 Uses

Headache
Toothache
Muscle pain
Arthritis pain

🌡️ 2. Antipyretic Action

👉 Fever में prostaglandins hypothalamus पर action करते हैं।

👉 NSAIDs prostaglandins कम करके body temperature normal करती हैं।

💧 3. Anti-Inflammatory Action

👉 NSAIDs swelling, redness और inflammation कम करती हैं।

🩸 4. Antiplatelet Action

👉 विशेषकर Aspirin।

👉 Aspirin thromboxane A₂ कम करती है।

👉 इससे platelets कम चिपकते हैं और clot formation कम होती है।

📚 Classification of NSAIDs

🔹 1. Salicylates

Aspirin
Diflunisal
Sodium salicylate

🔹 2. Propionic Acid Derivatives

Ibuprofen
Naproxen
Ketoprofen
Flurbiprofen

🔹 3. Acetic Acid Derivatives

Diclofenac
Indomethacin
Ketorolac
Sulindac

🔹 4. Fenamates

Mefenamic acid
Meclofenamate

🔹 5. Oxicams

Piroxicam
Meloxicam
Tenoxicam

🔹 6. Selective COX-2 Inhibitors

Celecoxib
Etoricoxib

🔹 7. Para-aminophenol Derivative

Paracetamol

⭐ Aspirin

🧪 Chemical Name

👉 Acetylsalicylic Acid

⚗️ Synthesis of Aspirin

👉 Aspirin salicylic acid और acetic anhydride से बनती है।

📌 Catalyst

Concentrated H₂SO₄

⚙️ Mechanism of Aspirin

👉 Aspirin irreversibly COX enzyme को inhibit करती है।

👉 Platelets नया COX enzyme नहीं बना पाते।

👉 इसलिए aspirin का effect 7–10 days तक रहता है।

🎯 Actions of Aspirin

💥 Analgesic

👉 Mild to moderate pain में useful।

📌 Example

Headache
Toothache
Joint pain

🌡️ Antipyretic

👉 Fever कम करती है।

💧 Anti-Inflammatory

👉 Rheumatoid arthritis में useful।

🩸 Antiplatelet

👉 Heart attack और stroke prevention में use होती है।

💊 Low Dose Aspirin क्यों दी जाती है?

👉 Low dose:

✔️ Thromboxane कम करती है
✔️ Clot formation रोकती है

👉 इसलिए heart attack prevention में use होती है।

📌 Uses of Aspirin

Fever
Headache
Arthritis
Stroke prevention
Heart attack prevention
Angina

⚠️ Side Effects of Aspirin

🔥 Gastric Irritation

👉 COX-1 inhibition के कारण।

📌 Symptoms

Acidity
Ulcer
Stomach pain

🩸 Bleeding

👉 Platelet aggregation कम हो जाती है।

🎧 Salicylism

📌 Symptoms

Tinnitus
Dizziness
Sweating
Hyperventilation

🧠 Reye’s Syndrome

👉 Viral infection वाले बच्चों में aspirin dangerous हो सकती है।

📌 Effects

Liver failure
Brain swelling

👉 इसलिए बच्चों में aspirin avoid करते हैं।

💊 Ibuprofen

📚 Class

👉 Propionic Acid Derivative

⚙️ Mechanism

👉 Reversible COX inhibition

📌 Uses

Fever
Body pain
Arthritis
Dental pain

⚠️ Side Effects

Gastritis
Nausea
Kidney damage

💊 Diclofenac

📚 Class

👉 Acetic Acid Derivative

📌 Uses

Muscle pain
Back pain
Arthritis

⚠️ Side Effects

Liver toxicity
Gastric ulcer

💊 Indomethacin

📌 Uses

Acute gout
Rheumatoid arthritis
PDA closure

❓ PDA closure कैसे?

👉 PDA prostaglandins की वजह से open रहता है।

👉 Indomethacin prostaglandins कम करती है।

👉 इसलिए PDA बंद हो जाता है।

💊 Ketorolac

⭐ Very Powerful Analgesic

👉 Severe pain में use।

📌 Example

Post-operative pain

⚠️ Side Effects

GI bleeding
Kidney toxicity

👉 इसलिए short duration use किया जाता है।

💊 Mefenamic Acid

📌 Uses

Menstrual pain
Dysmenorrhea

❓ Dysmenorrhea में useful क्यों?

👉 Periods में prostaglandins uterus contraction बढ़ाते हैं।

👉 Mefenamic acid prostaglandins कम करती है।

👉 इसलिए cramps कम होते हैं।

💊 Piroxicam

⭐ Long Acting NSAID

✔️ Advantage

Once daily dose

⚠️ Disadvantage

High ulcer risk

💊 Meloxicam

⭐ Preferential COX-2 inhibitor

✔️ Advantage

Less gastric irritation

👉 क्योंकि COX-1 कम inhibit होता है।

💊 Celecoxib

⭐ Selective COX-2 inhibitor

✔️ Benefit

Stomach safer

⚠️ Cardiac Risk क्यों?

👉 Prostacyclin कम हो जाता है लेकिन thromboxane बना रहता है।

👉 इससे clot risk बढ़ता है।

💊 Paracetamol

⭐ Important Point

👉 Technically pure NSAID नहीं माना जाता।

👉 क्योंकि इसका anti-inflammatory effect बहुत weak है।

⚙️ Mechanism

👉 CNS prostaglandins inhibit करता है।

📌 Uses

Fever
Headache
Mild pain

✔️ Paracetamol stomach safe क्यों?

👉 Peripheral COX inhibition बहुत कम होती है।

👉 इसलिए gastric irritation कम होती है।

⚠️ Paracetamol Overdose

👉 Toxic metabolite NAPQI बनता है।

👉 Excess NAPQI liver damage करता है।

📌 Effects

Liver necrosis
Liver failure

💉 Antidote

👉 N-Acetylcysteine (NAC)

⚠️ Common Side Effects of NSAIDs

🔥 GI Effects

Gastritis
Ulcer
Bleeding

💧 Renal Effects

Kidney injury
Sodium retention
Edema

❤️ Cardiovascular Effects

Hypertension
Heart attack risk

🤧 Allergy

Asthma
Rash
Bronchospasm

🚫 Contraindications

👉 NSAIDs avoid करनी चाहिए:

Peptic ulcer
Kidney disease
Bleeding disorders
Aspirin allergy
Late pregnancy

🤰 Pregnancy में NSAIDs dangerous क्यों?

👉 Fetal ductus arteriosus prematurely बंद हो सकता है।

🔄 Drug Interactions

💊 Combination	⚠️ Effect
NSAID + Warfarin	Severe bleeding
NSAID + Steroid	Ulcer risk
NSAID + Alcohol	Gastric bleeding
NSAID + Antihypertensive	BP medicines कम effective

📊 Comparison Table

Drug	Main Benefit	Main Risk
Aspirin	Antiplatelet	Bleeding
Ibuprofen	Safer analgesic	Gastritis
Diclofenac	Strong anti-inflammatory	Liver toxicity
Ketorolac	Strong pain relief	GI bleeding
Celecoxib	Less ulcer	Cardiac risk
Paracetamol	Safe antipyretic	Liver toxicity

📝 Important Exam Points

⭐ Long Questions

Mechanism of NSAIDs
Classification of NSAIDs
Aspirin pharmacology
COX-1 vs COX-2
Adverse effects of NSAIDs

⭐ Short Notes

Reye’s syndrome
Salicylism
Aspirin asthma
Paracetamol poisoning
COX-2 inhibitors

🤩 Amazing Facts

👉 Aspirin दुनिया की सबसे ज्यादा studied drugs में से एक है।

👉 Low dose aspirin heart attack prevention में daily दी जाती है।

👉 Diclofenac vultures के लिए toxic है इसलिए कई देशों में veterinary use ban है।

👉 Paracetamol overdose liver transplant तक की जरूरत पैदा कर सकता है।

👉 Ibuprofen और aspirin साथ लेने पर aspirin का cardioprotective effect कम हो सकता है।

📖 Conclusion

👉 NSAIDs pain, fever और inflammation को कम करने वाली बहुत महत्वपूर्ण drugs हैं।

👉 ये mainly prostaglandin synthesis रोककर काम करती हैं।

👉 Aspirin सबसे important NSAID है क्योंकि इसमें:

✔️ Analgesic action
✔️ Antipyretic action
✔️ Anti-inflammatory action
✔️ Antiplatelet action

चारों effects पाए जाते हैं।

👉 हालांकि NSAIDs useful हैं, लेकिन इनके:

⚠️ Gastric ulcer
⚠️ Kidney damage
⚠️ Bleeding
⚠️ Cardiac risks

को समझना बहुत जरूरी है।

👉 इसलिए NSAIDs का use हमेशा सही dose और सही duration में करना चाहिए।

📊 NSAIDs Important Tables for Exams

🧬 Table 1: Basic Introduction of NSAIDs

📌 Point	📝 Description
💊 Full Form	Non-Steroidal Anti-Inflammatory Drugs
🎯 Main Actions	Analgesic, Antipyretic, Anti-inflammatory
⚙️ Main Mechanism	COX enzyme inhibition
🧪 Main Mediator Reduced	Prostaglandins
🔥 Used In	Pain, Fever, Inflammation
⭐ Most Important Drug	Aspirin

⚙️ Table 2: Mechanism of NSAIDs

🧪 Step	📖 Explanation
1️⃣ Injury occurs	Cell membrane damage
2️⃣ Arachidonic acid released	From phospholipids
3️⃣ COX enzyme acts	Forms prostaglandins
4️⃣ Prostaglandins produced	Cause pain & fever
5️⃣ NSAIDs inhibit COX	Prostaglandins decrease
6️⃣ Final effect	Pain, fever, inflammation reduced

🧬 Table 3: COX-1 vs COX-2

📌 Feature	🛡️ COX-1	🔥 COX-2
Nature	Protective	Inflammatory
Present	Normally present	Induced during inflammation
Main Role	Stomach protection	Pain & inflammation
Platelets	Present	Absent
Stomach	Protects mucosa	No major role
Kidney	Maintains blood flow	Minor role
Inhibition Result	Ulcer & bleeding	Anti-inflammatory effect

📚 Table 4: Classification of NSAIDs

📂 Class	💊 Drugs
Salicylates	Aspirin, Diflunisal
Propionic Acid Derivatives	Ibuprofen, Naproxen
Acetic Acid Derivatives	Diclofenac, Indomethacin, Ketorolac
Fenamates	Mefenamic acid
Oxicams	Piroxicam, Meloxicam
Selective COX-2 Inhibitors	Celecoxib, Etoricoxib
Para-aminophenol Derivative	Paracetamol

⭐ Table 5: Aspirin Summary

📌 Point	📝 Detail
Chemical Name	Acetylsalicylic acid
Class	Salicylate
COX Inhibition	Irreversible
Main Actions	Analgesic, Antipyretic, Anti-inflammatory, Antiplatelet
Main Uses	Fever, Pain, MI prevention
Important Toxicity	Gastric bleeding
Special Syndrome	Reye’s syndrome
Toxicity Name	Salicylism

⚗️ Table 6: Synthesis of Aspirin

🧪 Reactant	➡️ Product
Salicylic acid + Acetic anhydride	Aspirin + Acetic acid

📌 Catalyst	Concentrated H₂SO₄

🎯 Table 7: Actions of Aspirin

⚙️ Action	📖 Explanation
💥 Analgesic	Reduces pain
🌡️ Antipyretic	Reduces fever
💧 Anti-inflammatory	Reduces swelling
🩸 Antiplatelet	Prevents clot formation

⚠️ Table 8: Side Effects of Aspirin

⚠️ Side Effect	❓ Reason
Gastritis	COX-1 inhibition
Ulcer	Less mucus protection
Bleeding	Platelet inhibition
Tinnitus	Salicylism
Reye’s syndrome	Use in viral infection children
Asthma	Leukotriene increase

💊 Table 9: Important NSAIDs with Uses

💊 Drug	📌 Uses
Aspirin	MI prevention, fever
Ibuprofen	Pain & fever
Diclofenac	Arthritis
Indomethacin	Acute gout
Ketorolac	Severe pain
Mefenamic acid	Menstrual pain
Celecoxib	Arthritis
Paracetamol	Fever

⚠️ Table 10: NSAIDs Side Effects

⚠️ Organ System	📌 Effects
Stomach	Gastritis, ulcer
Kidney	Renal failure
Blood	Bleeding
CVS	Hypertension
Respiratory	Asthma
Liver	Hepatotoxicity

💧 Table 11: NSAIDs and Kidney Damage

📌 Step	📖 Explanation
NSAIDs inhibit prostaglandins	Kidney blood flow decreases
Reduced renal perfusion	Kidney injury occurs
Sodium retention	Edema develops
Severe effect	Renal failure

❤️ Table 12: COX-2 Inhibitors

💊 Drug	✔️ Advantage	⚠️ Disadvantage
Celecoxib	Less gastric ulcer	Cardiac risk
Etoricoxib	Strong anti-inflammatory	Hypertension

🌡️ Table 13: Paracetamol Summary

📌 Point	📝 Detail
Main Action	Antipyretic
Anti-inflammatory Action	Weak
Stomach Effect	Safer
Main Toxicity	Liver damage
Toxic Metabolite	NAPQI
Antidote	N-Acetylcysteine

🧠 Table 14: Reye’s Syndrome

📌 Point	📝 Detail
Seen In	Children
Trigger	Viral infection + Aspirin
Main Effects	Liver failure & brain edema
Prevention	Avoid aspirin in children

🩸 Table 15: Antiplatelet Action of Aspirin

📌 Step	📖 Explanation
Aspirin inhibits COX-1	Thromboxane decreases
Platelets cannot aggregate	Clot formation decreases
Final Effect	Prevention of MI & stroke

🤰 Table 16: NSAIDs in Pregnancy

⚠️ Problem	❓ Reason
Premature closure of ductus arteriosus	Prostaglandin inhibition
Fetal complications	Reduced blood flow

🔄 Table 17: Drug Interactions

💊 Combination	⚠️ Result
NSAID + Warfarin	Severe bleeding
NSAID + Steroid	Ulcer risk
NSAID + Alcohol	Gastric bleeding
NSAID + Antihypertensive	Reduced BP control

📊 Table 18: Comparison of Important NSAIDs

💊 Drug	⭐ Main Benefit	⚠️ Main Risk
Aspirin	Antiplatelet	Bleeding
Ibuprofen	Safer analgesic	Gastritis
Diclofenac	Strong anti-inflammatory	Liver toxicity
Indomethacin	Gout treatment	CNS effects
Ketorolac	Powerful analgesic	GI bleeding
Celecoxib	Less gastric ulcer	Cardiac risk
Paracetamol	Safe antipyretic	Liver toxicity

📝 Table 19: Important Exam Questions

⭐ Long Questions	⭐ Short Notes
Mechanism of NSAIDs	Salicylism
Classification of NSAIDs	Reye’s syndrome
Pharmacology of Aspirin	Aspirin asthma
COX-1 vs COX-2	Paracetamol poisoning
Adverse effects of NSAIDs	COX-2 inhibitors

Table 20: Amazing Facts

🤩 Fact	📖 Explanation
Aspirin prevents heart attack	Antiplatelet action
Diclofenac toxic to vultures	Causes kidney failure in birds
Paracetamol overdose dangerous	Severe liver necrosis
Ibuprofen safer than aspirin	Less gastric toxicity
COX-2 inhibitors stomach safe	Less COX-1 inhibition

🔖 References – NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)

📚 Standard Pharmacology Textbooks

Katzung's Basic & Clinical Pharmacology https://accesspharmacy.mhmedical.com/book.aspx?bookID=3388
Goodman & Gilman's The Pharmacological Basis of Therapeutics https://accessmedicine.mhmedical.com/book.aspx?bookID=2189
Rang & Dale's Pharmacology https://www.elsevier.com/books/rang-and-dales-pharmacology
Tripathi's Essentials of Medical Pharmacology https://jaypeebrothers.com/product/essentials-of-medical-pharmacology
Lippincott Illustrated Reviews: Pharmacology https://shop.lww.com/Lippincott-Illustrated-Reviews--Pharmacology/p/9781975171724

📖 Official & Trusted Medical References

National Center for Biotechnology Information (NCBI) https://www.ncbi.nlm.nih.gov
NCBI Bookshelf – NSAIDs Overview https://www.ncbi.nlm.nih.gov/books
MedlinePlus – NSAIDs https://medlineplus.gov
U.S. Food and Drug Administration (FDA) https://www.fda.gov
World Health Organization (WHO) https://www.who.int
British National Formulary (BNF) https://bnf.nice.org.uk
NHS Medicines Information https://www.nhs.uk/medicines
MSD Manual Professional Edition https://www.msdmanuals.com/professional
Merck Manual Consumer Version https://www.merckmanuals.com
Mayo Clinic Drug Information https://www.mayoclinic.org/drugs-supplements

📑 Specific References for Aspirin & Paracetamol

Aspirin Drug Information https://www.ncbi.nlm.nih.gov/books/NBK519032
Paracetamol (Acetaminophen) Toxicity https://www.ncbi.nlm.nih.gov/books/NBK441917
FDA Aspirin Information https://www.fda.gov/drugs
FDA Acetaminophen Information https://www.fda.gov/drugs/information-drug-class/acetaminophen-information