🌟 Hormones and Drugs Affecting Calcium Balance

🦴 Calcitonin, Vitamin D, Calcium Balance, Osteoporosis, Hypercalcemia, Rickets & Related Drugs

🌈 Introduction

🔶 Calcium (Ca²⁺) शरीर का सबसे important minerals में से एक है।
🔶 लगभग 99% calcium bones और teeth में stored रहता है।
🔶 बाकी 1% blood और cells में रहता है लेकिन यही 1% life-saving functions करता है।

⚡ Functions of Calcium in Body

🫀 Heart Function

🔹 Calcium heart muscle contraction के लिए जरूरी है।

➡ अगर calcium कम हो जाए → heart contraction weak हो सकती है।

💪 Muscle Contraction

🔹 Muscle contraction calcium के बिना possible नहीं है।

➡ Calcium actin और myosin interaction करवाता है।

🧠 Nerve Transmission

🔹 Neurotransmitter release calcium dependent होता है।

➡ Calcium nerve impulse transmission में मदद करता है।

🩸 Blood Clotting

🔹 Clotting factors activation के लिए calcium जरूरी है।

➡ इसलिए calcium को clotting factor IV भी कहते हैं।

🎯 Calcium Balance Maintain करने वाले Main Hormones

Hormone	Main Function
Parathyroid Hormone (PTH)	Blood calcium बढ़ाता है
Calcitonin	Blood calcium कम करता है
Vitamin D (Calcitriol)	Calcium absorption बढ़ाता है

🌟 Important Full Forms

Short Form	Full Form
PTH	Parathyroid Hormone
VDR	Vitamin D Receptor
GPCR	G-Protein Coupled Receptor
RANKL	Receptor Activator of Nuclear Factor Kappa-B Ligand
Ca²⁺	Calcium ion
PO₄³⁻	Phosphate

🧠 Why Body Controls Calcium So Strictly?

🔶 क्योंकि calcium level थोड़ा भी ज्यादा या कम हो जाए तो:

❌ Muscle spasm
❌ Arrhythmia
❌ Convulsions
❌ Cardiac arrest

हो सकता है।

➡ इसलिए body hormones के through calcium tightly regulate करती है।

🌟 Diseases Related to Calcium Imbalance

① 🔥 Hypercalcemia

📌 Meaning

🔶 Blood calcium level normal से ज्यादा होना।

📌 Causes

✔ Hyperparathyroidism
✔ Vitamin D overdose
✔ Cancer
✔ Bone destruction

📌 Symptoms

✔ Kidney stones
✔ Bone pain
✔ Constipation
✔ Confusion
✔ Arrhythmia

🧠 Why Kidney Stones Occur?

🔶 Blood में calcium ज्यादा हो जाता है।

➡ Excess calcium urine में जाता है।

➡ Kidney में crystals बन जाते हैं।

➡ Stone formation हो जाती है।

② ❄ Hypocalcemia

📌 Meaning

🔶 Blood calcium level कम होना।

📌 Symptoms

✔ Muscle spasm
✔ Tetany
✔ Convulsions
✔ Tingling sensation

🧠 Why Tetany Occurs?

🔶 Calcium nerves को stabilize करता है।

🔶 Calcium कम होने पर nerves overexcitable हो जाती हैं।

➡ Repeated muscle contraction होने लगती है।

➡ Tetany develop होती है।

③ 👶 Rickets

📌 What is Rickets?

🔶 बच्चों में Vitamin D deficiency disease

➡ Bones properly mineralize नहीं होतीं।

📌 Symptoms

✔ Bow legs
✔ Delayed growth
✔ Bone deformity

🧠 Why Bow Legs Occur?

🔶 Weak bones body weight सहन नहीं कर पातीं।

➡ Legs bend होने लगती हैं।

④ 🦴 Osteomalacia

📌 Meaning

🔶 Adults में Vitamin D deficiency

➡ Bone softening disease

📌 Symptoms

✔ Bone pain
✔ Weakness
✔ Fracture tendency

🧠 Why Bones Become Soft?

🔶 Calcium deposition proper नहीं होती।

➡ Osteoid mineralize नहीं होता।

➡ Bone soft रह जाती है।

⑤ 🦴 Osteoporosis

📌 Meaning

🔶 Bone mass decrease होना

➡ Bones porous और fragile हो जाती हैं।

📌 Causes

✔ Aging
✔ Menopause
✔ Steroid use
✔ Calcium deficiency

🧠 Why Menopause Causes Osteoporosis?

🔶 Estrogen normally osteoclasts को suppress करता है।

🔶 Menopause में estrogen कम हो जाता है।

➡ Osteoclast activity बढ़ जाती है।

➡ Bone breakdown बढ़ जाता है।

🌟 CALCITONIN

📌 What is Calcitonin?

🔶 Calcitonin thyroid gland के parafollicular C-cells से secret होने वाला peptide hormone है।

🎯 Main Function

✅ Blood calcium कम करना

🧠 Why Body Releases Calcitonin?

🔶 जब blood calcium ज्यादा बढ़ जाता है।

➡ Body bones को protect करना चाहती है।

➡ इसलिए calcitonin release होता है।

📚 Classification of Calcitonin

① 🐟 Salmon Calcitonin

✔ Most potent
✔ Long acting
✔ Clinical use सबसे ज्यादा

② 👨 Human Calcitonin

✔ Less potent

🧠 Why Salmon Calcitonin More Potent?

🔶 इसकी receptor affinity ज्यादा होती है।

➡ Strong binding करता है।

➡ Effect ज्यादा आता है।

🌟 Mechanism of Action of Calcitonin

📍 Receptor

🔶 Calcitonin receptor

📍 Receptor Type

🔶 GPCR
(G-Protein Coupled Receptor)

📍 Site of Action

✔ Bone
✔ Kidney

⚙ Mechanism in Bone

🔶 Osteoclasts bone destroy करते हैं।

🔶 Calcitonin osteoclast activity inhibit करता है।

➡ Bone breakdown कम

➡ Calcium release कम

➡ Blood calcium कम

🧠 Why Osteoclast Inhibition Important?

🔶 Excess osteoclast activity bone weak बना देती है।

➡ Fracture risk बढ़ता है।

➡ इसलिए osteoclast inhibition useful है।

⚙ Mechanism in Kidney

🔶 Calcium और phosphate excretion बढ़ाता है।

➡ Urine में calcium ज्यादा निकलता है।

➡ Blood calcium कम होता है।

🌟 Pharmacological Effects

✔ Serum calcium ↓
✔ Bone resorption ↓
✔ Bone pain ↓

💊 Uses of Calcitonin

① 🔥 Hypercalcemia

🔶 Emergency hypercalcemia में rapid action

② 🦴 Osteoporosis

🔶 Bone loss कम करता है।

③ 🌀 Paget Disease

📌 What is Paget Disease?

🔶 Bone remodeling disorder

➡ Excessive abnormal bone formation

🧠 Why Bone Weak होती है?

🔶 Remodeling abnormal होती है।

➡ Bone structure disorganized बन जाती है।

④ 💥 Bone Pain

🔶 Vertebral fracture pain कम करता है।

⚠ Side Effects of Calcitonin

✔ Nausea
✔ Vomiting
✔ Facial flushing
✔ Allergy
✔ Hypocalcemia

🌟 VITAMIN D

📌 What is Vitamin D?

🔶 Fat-soluble vitamin + hormone

📚 Classification

① 🌱 Vitamin D₂ (Ergocalciferol)

✔ Plant source

② ☀ Vitamin D₃ (Cholecalciferol)

✔ Animal source
✔ Skin में UV light से बनता है

📌 Active Analogues

✔ Calcitriol
✔ Alfacalcidol
✔ Paricalcitol
✔ Doxercalciferol

🌞 Formation of Vitamin D

☀ Step 1 — Skin

7-Dehydrocholesterol
↓ UV light
Cholecalciferol

🧪 Step 2 — Liver

Cholecalciferol
↓ 25-hydroxylase
25-OH Vitamin D

🩺 Step 3 — Kidney

25-OH Vitamin D
↓ 1-alpha hydroxylase
Calcitriol

🌟 Active Form

✅ Calcitriol

🧠 Why Kidney Important in Vitamin D Activation?

🔶 Final activation kidney में होती है।

➡ Kidney disease में active vitamin D कम बनता है।

➡ Bone disease develop हो सकती है।

🌟 Mechanism of Action of Vitamin D

📍 Receptor

🔶 VDR
(Vitamin D Receptor)

📍 Receptor Type

🔶 Nuclear receptor

🧠 Why Nuclear Receptor?

🔶 Vitamin D gene transcription change करता है।

➡ New proteins synthesis करवाता है।

➡ इसलिए action slow but long-lasting होता है।

📍 Site of Action

✔ Intestine
✔ Bone
✔ Kidney
✔ Parathyroid gland

⚙ Mechanism in Intestine

🔶 Calcium-binding proteins synthesis बढ़ाता है।

➡ Calcium absorption increase

➡ Phosphate absorption increase

🧠 Why Calcium Absorption Increase?

🔶 Vitamin D transport proteins बनवाता है।

➡ Calcium आसानी से intestinal cells cross करता है।

⚙ Mechanism in Bone

🔶 Bone mineralization improve करता है।

➡ Calcium phosphate deposition बढ़ती है।

➡ Bones strong बनती हैं।

⚙ Mechanism in Kidney

🔶 Calcium reabsorption बढ़ाता है।

➡ Calcium urine में कम loss होता है।

⚙ Mechanism in Parathyroid

🔶 PTH secretion suppress करता है।

🌟 Uses of Vitamin D

① 👶 Rickets

✔ Children

② 🦴 Osteomalacia

✔ Adults

③ 🦴 Osteoporosis

✔ Bone strength improve

④ ❄ Hypocalcemia

✔ Calcium level increase

⑤ 🩺 Hypoparathyroidism

📌 What is Hypoparathyroidism?

🔶 PTH deficiency disease

➡ Calcium level कम हो जाता है।

⑥ 🩸 Renal Osteodystrophy

📌 What is Renal Osteodystrophy?

🔶 Chronic kidney disease से bone disorder

🧠 Why It Occurs?

🔶 Kidney active Vitamin D नहीं बना पाती।

➡ Calcium absorption कम

➡ Bone weak

⚠ Vitamin D Toxicity

🚨 Hypervitaminosis D

📌 Symptoms

✔ Hypercalcemia
✔ Kidney stones
✔ Vomiting
✔ Weakness
✔ Polyuria

🧠 Why Polyuria Occurs?

🔶 Excess calcium kidney concentrating ability खराब करता है।

➡ Urine output बढ़ जाता है।

🌟 BISPHOSPHONATES

📚 Classification

✔ Alendronate
✔ Risedronate
✔ Ibandronate
✔ Zoledronic acid
✔ Pamidronate

📌 Mechanism

🔶 Osteoclast apoptosis करवाते हैं।

📌 Apoptosis Meaning

➡ Programmed cell death

🧠 Why Useful in Osteoporosis?

🔶 Osteoclast destruction होने से bone breakdown कम होता है।

➡ Bone density बढ़ती है।

⚠ Side Effects

✔ Esophagitis
✔ Jaw osteonecrosis
✔ Bone pain

🧠 Why Esophagitis Occurs?

🔶 Drug esophageal mucosa irritate करती है।

➡ इसलिए patient को सीधा बैठकर पानी के साथ लेना चाहिए।

🌟 DENOSUMAB

📌 What is Denosumab?

🔶 Monoclonal antibody

📍 Target

🔶 RANKL

🧠 Full Form of RANKL

✅ Receptor Activator of Nuclear Factor Kappa-B Ligand

⚙ Mechanism

🔶 Osteoclast formation रोकता है।

➡ Bone destruction कम

💊 Uses

✔ Osteoporosis
✔ Bone metastasis

⚠ Side Effects

✔ Hypocalcemia
✔ Infection risk

🌟 TERIPARATIDE

📌 What is Teriparatide?

🔶 Recombinant PTH analogue

📍 Receptor

🔶 PTH receptor

⚙ Mechanism

🔶 Intermittent low dose osteoblast activate करती है।

➡ New bone formation

🧠 Why Continuous PTH Harmful?

🔶 Continuous PTH osteoclast activation करता है।

➡ Bone destruction बढ़ती है।

🧠 Why Intermittent PTH Helpful?

🔶 Intermittent exposure osteoblasts को ज्यादा stimulate करता है।

➡ Bone formation increase

🌟 CALCIUM PREPARATIONS

📚 Drugs

✔ Calcium carbonate
✔ Calcium citrate
✔ Calcium gluconate
✔ Calcium lactate

🧠 Difference Between Carbonate & Citrate

🟢 Calcium Carbonate

✔ Cheap
✔ Needs acidic medium

🟣 Calcium Citrate

✔ Better absorption
✔ Acid-independent

🌟 Important Drug Examples According to Diseases

Disease	Drug
Hypercalcemia	Calcitonin
Osteoporosis	Bisphosphonates
Rickets	Vitamin D
Hypocalcemia	Calcium gluconate
Severe osteoporosis	Teriparatide

🌟 One-Line Quick Revision

🔶 Calcitonin → Calcium कम करता है
🔶 Vitamin D → Calcium absorption बढ़ाता है
🔶 Bisphosphonates → Osteoclast kill करते हैं
🔶 Denosumab → RANKL block करता है
🔶 Teriparatide → Bone formation बढ़ाता है

🌟 Most Important Exam Viva Questions

❓ Active Vitamin D form?

✅ Calcitriol

❓ Most potent calcitonin?

✅ Salmon calcitonin

❓ Vitamin D receptor type?

✅ Nuclear receptor

❓ Drug causing osteoclast apoptosis?

✅ Bisphosphonates

❓ Which hormone lowers serum calcium?

✅ Calcitonin

🎯 Final Conclusion

🔶 Calcium balance body survival के लिए अत्यंत important है।
🔶 Calcitonin blood calcium कम करता है जबकि Vitamin D calcium absorption बढ़ाता है।
🔶 Osteoporosis, rickets, osteomalacia, hypercalcemia जैसी diseases में इन drugs का बहुत महत्वपूर्ण role है।
🔶 इन drugs का mechanism properly समझना pharmacology exams और clinical practice दोनों के लिए जरूरी है।

🌟 Mnemonics & Word Tricks for Drugs Affecting Calcium Balance

📚 Prefix–Suffix–Common Word Tricks for Easy

🌟 1️⃣ Vitamin D Drugs Trick

💊 Drugs

✔ Ergocalciferol
✔ Cholecalciferol
✔ Calcitriol
✔ Alfacalcidol
✔ Paricalcitol
✔ Doxercalciferol

🧠 Common Word Trick

🔥 “CALCI / CAL / CALCIFER”

Common Word	Meaning
CAL	Calcium
CALCI	Calcium action
CALCIFEROL	Vitamin D type compound

🎯 Easy Logic

🔶 Vitamin D drugs calcium बढ़ाती हैं।

➡ इसलिए इनके नाम में “CAL” frequently आता है।

🧠 Important Stem Tricks

Stem	Meaning
-calciferol	Vitamin D precursor
-calcidol	Active Vitamin D analogue
-triol	Active hydroxylated form

🌟 Mnemonic

☀ “CAL Drugs Carry Calcium”

➡ CAL word दिखे → Vitamin D/Calcium related सोचो

🌟 Individual Drug Tricks

💊 Ergocalciferol

🧠 “ERGO = Plant worker”

➡ Plant source Vitamin D₂

💊 Cholecalciferol

🧠 “CHOLE = Cholesterol”

➡ Skin cholesterol से बनता है

💊 Calcitriol

🧠 “TRIOL = 3 OH groups”

➡ Fully active form

🌟 2️⃣ Calcitonin Trick

💊 Drugs

✔ Salmon calcitonin
✔ Human calcitonin

🧠 Common Word

🔥 “TONIN”

➡ Hormone-type peptide

🧠 Main Logic

“CALCI-TONIN = Calcium Tone Down”

➡ Blood calcium कम करता है

🌟 Mechanism Trick

🧠 “TONIN Tones Down Osteoclast”

➡ Osteoclast inhibit करता है

➡ Bone breakdown कम

🌟 3️⃣ Bisphosphonates Trick

💊 Drugs

✔ Alendronate
✔ Risedronate
✔ Ibandronate
✔ Zoledronic acid
✔ Pamidronate

🧠 Common Suffix

🔥 “-DRONATE / -RONATE”

Stem	Meaning
-dronate	Bone binding drug
-ronate	Osteoclast inhibitor

🎯 Easy Trick

“DRO = Destroy osteoclast”

➡ Osteoclast apoptosis

➡ Bone breakdown कम

🧠 Why These Drugs Bind Bone?

🔶 ये phosphate जैसे दिखते हैं।

➡ Bone hydroxyapatite से strongly bind करते हैं।

🌟 Powerful Mnemonic

💥 “DRONATE Drugs Drop Bone Resorption”

🌟 Individual Drug Tricks

💊 Alendronate

🧠 “A-LEN-DRO-NATE”

➡ Long acting osteoporosis drug

💊 Zoledronic Acid

🧠 “ZOLE = Zor se strong”

➡ Most potent bisphosphonate

🌟 4️⃣ Monoclonal Antibody Trick

💊 Drug

✔ Denosumab

🧠 Common Suffix

🔥 “-MAB”

Suffix	Meaning
-mab	Monoclonal antibody

🧠 Easy Logic

🔶 जिस drug के end में “MAB” आए:

➡ Monoclonal antibody

🎯 Denosumab Trick

“DE-NO-SU-MAB”

➡ “NO” osteoclast formation

➡ RANKL inhibit करता है

🌟 Mechanism Trick

🧠 “MAB Means Marker Blocking”

➡ Specific target block करता है

🌟 5️⃣ Teriparatide Trick

💊 Drug

✔ Teriparatide

🧠 Common Word

🔥 “PARA”

➡ Parathyroid hormone related

🧠 Main Logic

🔶 PTH analogue है।

➡ Bone formation बढ़ाता है।

🎯 Mnemonic

“TERI Repairs Bone”

➡ Severe osteoporosis में use

🌟 6️⃣ Calcium Preparations Trick

💊 Drugs

✔ Calcium carbonate
✔ Calcium citrate
✔ Calcium gluconate
✔ Calcium lactate

🧠 Common Word

🔥 “CALCIUM”

➡ Direct calcium supplement

🧠 Salt-Based Trick

Salt	Important Point
Carbonate	Cheap
Citrate	Better absorption
Gluconate	IV emergency use

🌟 Disease-Based Mnemonics

👶 Rickets

🧠 “RICKETY CHILD”

➡ Weak bent bones

➡ Vitamin D deficiency

🦴 Osteomalacia

🧠 “MALACIA = Malleable soft”

➡ Soft bones in adults

🦴 Osteoporosis

🧠 “POROUS BONE”

➡ Bone holes increase

🌟 Receptor Tricks

Receptor	Easy Trick
VDR	Vitamin D receptor
GPCR	Fast membrane receptor
RANKL	Osteoclast activation ligand

🧠 GPCR Trick

“GPCR = Go Perform Cell Response Fast”

➡ Fast peptide hormone action

➡ Example → Calcitonin

🧠 Nuclear Receptor Trick

“Nucleus = New protein formation”

➡ Slow but long action

➡ Example → Vitamin D

🌟 Osteoclast vs Osteoblast Trick

Cell	Function	Easy Trick
Osteoclast	Break bone	“CLAST = Crash”
Osteoblast	Build bone	“BLAST = Build”

🌟 Mechanism-Based Master Trick

Drug Class	Common Word	Main Mechanism
Vitamin D drugs	CAL / CALCI	Calcium absorption ↑
Calcitonin	TONIN	Calcium ↓
Bisphosphonates	DRONATE	Osteoclast apoptosis
Monoclonal antibodies	MAB	Target blocking
PTH analogue	PARA	Bone formation

🌟 Super Mnemonic Story

🧠 “CAL Boys Build Bone, TONIN Turns Calcium Down, DRONATE Destroys Osteoclast, MAB Blocks Target”

🌟 Ultra-Short Rapid Revision

Drug Stem	Remember
-calciferol	Vitamin D
-calcidol	Active Vitamin D
-tonin	Calcium lowering
-dronate	Bisphosphonate
-mab	Monoclonal antibody
para-	PTH related

🎯 Final Memory Formula

🧠 “CAL builds Calcium, TONIN tones it down, DRONATE drops osteoclast, MAB blocks, PARA prepares bone”

🌟 Exam-Oriented Important Tables

📚 Hormones & Drugs Affecting Calcium Balance

🦴 Table 1 : Normal Calcium Regulating Hormones

Hormone	Source	Main Action	Blood Calcium Effect
Parathyroid Hormone (PTH)	Parathyroid gland	Bone resorption ↑	↑ Increase
Calcitonin	Thyroid C-cells	Osteoclast inhibition	↓ Decrease
Vitamin D (Calcitriol)	Kidney activated form	Calcium absorption ↑	↑ Increase

🌟 Table 2 : Important Full Forms

Short Form	Full Form
PTH	Parathyroid Hormone
GPCR	G-Protein Coupled Receptor
VDR	Vitamin D Receptor
RANKL	Receptor Activator of Nuclear Factor Kappa-B Ligand
Ca²⁺	Calcium Ion
PO₄³⁻	Phosphate Ion

💊 Table 3 : Classification of Drugs Affecting Calcium Balance

Class	Drugs
Vitamin D Preparations	Ergocalciferol, Cholecalciferol
Active Vitamin D Analogues	Calcitriol, Alfacalcidol, Paricalcitol
Calcitonin Preparations	Salmon calcitonin, Human calcitonin
Bisphosphonates	Alendronate, Risedronate, Zoledronic acid
Monoclonal Antibody	Denosumab
PTH Analogue	Teriparatide
Calcium Preparations	Calcium carbonate, Calcium citrate, Calcium gluconate

🌟 Table 4 : Calcitonin Pharmacology

Feature	Details
Source	Thyroid parafollicular C-cells
Receptor	Calcitonin receptor
Receptor Type	GPCR
Main Site	Bone, kidney
Main Action	Osteoclast inhibition
Blood Calcium	Decreases
Most Potent Form	Salmon calcitonin
Uses	Hypercalcemia, osteoporosis, Paget disease
Side Effects	Nausea, flushing, hypocalcemia

🌟 Table 5 : Vitamin D Pharmacology

Feature	Details
Type	Fat-soluble vitamin
Active Form	Calcitriol
Receptor	VDR
Receptor Type	Nuclear receptor
Main Site	Intestine, bone, kidney
Main Action	Calcium absorption ↑
Blood Calcium	Increases
Uses	Rickets, osteomalacia, hypocalcemia
Toxicity	Hypercalcemia

🌞 Table 6 : Formation of Vitamin D

Step	Organ	Process
Step 1	Skin	UV light converts 7-dehydrocholesterol → Vitamin D₃
Step 2	Liver	25-hydroxylation
Step 3	Kidney	1-alpha hydroxylation → Calcitriol

🌟 Table 7 : Calcitonin vs Vitamin D

Feature	Calcitonin	Vitamin D
Blood Calcium	↓ Decrease	↑ Increase
Main Action	Osteoclast inhibition	Calcium absorption ↑
Receptor	GPCR	Nuclear receptor
Main Organ	Bone	Intestine
Bone Effect	Prevents breakdown	Mineralization
Main Use	Hypercalcemia	Hypocalcemia

💥 Table 8 : Diseases Related to Calcium Imbalance

Disease	Main Problem	Cause
Hypercalcemia	Calcium ↑	Hyperparathyroidism, Vit D toxicity
Hypocalcemia	Calcium ↓	Vit D deficiency
Rickets	Weak bones in children	Vit D deficiency
Osteomalacia	Soft bones in adults	Vit D deficiency
Osteoporosis	Porous fragile bone	Aging, menopause

🌟 Table 9 : Hypercalcemia vs Hypocalcemia

Feature	Hypercalcemia	Hypocalcemia
Calcium Level	High	Low
Muscle Effect	Weakness	Tetany
Kidney Effect	Stones	None
CNS Effect	Confusion	Convulsions
Treatment	Calcitonin	Calcium + Vitamin D

💊 Table 10 : Bisphosphonates

Drug	Main Use	Important Side Effect
Alendronate	Osteoporosis	Esophagitis
Risedronate	Osteoporosis	GI irritation
Zoledronic acid	Hypercalcemia	Fever
Pamidronate	Paget disease	Bone pain

🌟 Table 11 : Denosumab

Feature	Details
Drug Type	Monoclonal antibody
Target	RANKL
Main Action	Osteoclast formation inhibition
Uses	Osteoporosis, bone metastasis
Side Effects	Hypocalcemia, infection

🌟 Table 12 : Teriparatide

Feature	Details
Drug Type	Recombinant PTH analogue
Receptor	PTH receptor
Main Action	Osteoblast stimulation
Uses	Severe osteoporosis
Side Effects	Hypercalcemia, leg cramps

🌟 Table 13 : Calcium Preparations

Drug	Important Point	Use
Calcium carbonate	Needs acidic medium	Osteoporosis
Calcium citrate	Better absorption	Elderly patients
Calcium gluconate	Injectable	Emergency hypocalcemia
Calcium lactate	Oral supplement	Calcium deficiency

🌟 Table 14 : Important Receptors

Drug/Hormone	Receptor
Calcitonin	Calcitonin receptor
Vitamin D	VDR
Teriparatide	PTH receptor
Denosumab	RANKL
Bisphosphonates	No receptor (bone binding)

🌟 Table 15 : Most Important Exam One-Liners

Question	Answer
Active form of Vitamin D	Calcitriol
Hormone lowering calcium	Calcitonin
Most potent calcitonin	Salmon calcitonin
Vitamin D receptor type	Nuclear receptor
Drug causing osteoclast apoptosis	Bisphosphonates
Monoclonal antibody in osteoporosis	Denosumab
PTH analogue	Teriparatide

🎯 Super Quick Final Revision Table

Drug	Mechanism	Main Use
Calcitonin	Osteoclast inhibition	Hypercalcemia
Vitamin D	Calcium absorption ↑	Rickets
Bisphosphonates	Osteoclast apoptosis	Osteoporosis
Denosumab	RANKL inhibition	Osteoporosis
Teriparatide	Osteoblast stimulation	Severe osteoporosis
Calcium gluconate	Calcium replacement	Hypocalcemia