Mey jo topic sand kr rha hu ushka exame ready notes bna dena notes aesha ki book padhne ki jarurat na pre Unit VI: Describe the drugs used in treatment of endocrine system disorders · Drugs used in treatment of endocrine system disorders · Insulin & oral hypoglycemics · Thyroid and anti-thyroid drugs · Steroids · Corticosteroids · Anabolic steroids · Calcitonin, parathormone, vitamin D3, calcium metabolism · Calcium salts · Composition, action, dosage, route, indications, contraindications, drug interactions, side effects, adverse effects, toxicity and role of nurse

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Good data on thyroid drugs. Now let me get the insulin/diabetes, corticosteroids, and calcium content in parallel using my remaining queries and my strong pharmacology knowledge base.

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I now have excellent thyroid drug content. Given my remaining budget, I'll use my comprehensive pharmacology knowledge (supplemented by the textbook data already retrieved) to compile the full exam-ready notes. Let me now write the complete, detailed notes document.Ab main puri comprehensive notes likhta hun — bilkul exam format mein, har drug ke liye composition, action, dosage, route, indications, contraindications, interactions, side effects, toxicity aur nursing role sab cover karke.

📚 UNIT VI — ENDOCRINE SYSTEM DRUGS

Exam-Ready Complete Notes

SECTION 1: INSULIN & ORAL HYPOGLYCEMICS

🔷 INSULIN

Composition / Types of Insulin

Type	Onset	Peak	Duration	Examples
Rapid-acting	10–30 min	30–90 min	3–5 hr	Lispro, Aspart, Glulisine
Short-acting (Regular)	30–60 min	2–4 hr	6–8 hr	Human Regular (Actrapid)
Intermediate-acting	1–2 hr	4–10 hr	12–18 hr	NPH (Isophane)
Long-acting	1–4 hr	Flat	20–24 hr	Glargine, Detemir
Ultra-long	6 hr	Flat	~42 hr	Degludec
Premixed	Dual	Dual	12–16 hr	70/30 NPH/Regular

Mechanism of Action

Binds to insulin receptor (tyrosine kinase receptor) on cell surface
Activates GLUT-4 transporters → glucose uptake in muscle & fat
Promotes glycogenesis, inhibits glycogenolysis & gluconeogenesis
Promotes protein synthesis, inhibits lipolysis
Promotes K⁺ entry into cells

Dosage & Route

SC injection — most common (abdomen, thigh, upper arm, buttock)
IV route — only Regular insulin (for DKA, ICU)
IM — emergency use
Dose: individualized; typical starting dose 0.5–1 unit/kg/day
Rotate injection sites to prevent lipodystrophy

Indications

Type 1 Diabetes Mellitus (mandatory)
Type 2 DM (oral failure, surgery, pregnancy, critical illness)
Diabetic Ketoacidosis (DKA) — IV Regular insulin
Hyperkalemia (with dextrose to shift K⁺ into cells)
Gestational diabetes

Contraindications

Hypoglycemia (do not give if blood sugar < 70 mg/dL)
Hypersensitivity to insulin or its components

Drug Interactions

Drug	Effect
Beta-blockers	Mask hypoglycemia symptoms; prolong hypoglycemia
Alcohol	Potentiates hypoglycemia
Corticosteroids, thiazides	Antagonize insulin → hyperglycemia
Salicylates (high dose)	Enhance hypoglycemic effect
MAO inhibitors	Potentiate hypoglycemia

Side Effects / Adverse Effects

Hypoglycemia — most common & dangerous (sweating, tremors, palpitations, confusion, coma)
Lipodystrophy — lipoatrophy or lipohypertrophy at injection site
Insulin allergy — local reactions, rarely anaphylaxis
Hypokalemia — insulin drives K⁺ into cells
Weight gain
Somogyi effect — rebound hyperglycemia after nocturnal hypoglycemia
Dawn phenomenon — early morning hyperglycemia due to GH surge

Toxicity

Insulin overdose → severe hypoglycemia → seizures → coma → death
Treatment: Oral glucose (mild), IV Dextrose 50% (severe), Glucagon 1 mg IM/SC

Role of Nurse

Check blood glucose before administration
Verify insulin type, dose, route (double-check with another nurse)
Use insulin syringe (never a regular syringe)
Store insulin properly (refrigerate; do not freeze or expose to heat)
Rotate injection sites systematically
Educate patient on hypoglycemia symptoms and management
Monitor for hypoglycemia signs — diaphoresis, shakiness, confusion
Teach patient to always carry glucose tablets/candy
Document blood sugar readings and insulin given
Teach injection technique and self-monitoring

🔷 ORAL HYPOGLYCEMIC DRUGS

Classification

Class	Examples
Sulfonylureas	Glibenclamide, Glipizide, Gliclazide, Glimepiride
Biguanides	Metformin
Thiazolidinediones (TZDs)	Pioglitazone, Rosiglitazone
Alpha-glucosidase inhibitors	Acarbose, Miglitol
DPP-4 inhibitors (Gliptins)	Sitagliptin, Vildagliptin
SGLT-2 inhibitors	Dapagliflozin, Empagliflozin
Meglitinides	Repaglinide, Nateglinide
GLP-1 agonists	Liraglutide, Exenatide (injectable but non-insulin)

A) SULFONYLUREAS (e.g., Glibenclamide, Glipizide)

MOA: Bind to SUR1 receptor on β-cells → block ATP-sensitive K⁺ channels → cell depolarization → Ca²⁺ influx → insulin secretion

Dose: Glibenclamide 2.5–20 mg/day OD or BD before meals

Route: Oral

Indications: Type 2 DM

Contraindications: Type 1 DM, pregnancy, renal/hepatic failure, hypoglycemia risk

Side Effects: Hypoglycemia (main risk), weight gain, nausea, rash, hemolytic anemia (rarely)

Drug Interactions: Alcohol, salicylates, sulfonamides → enhanced hypoglycemia; Rifampicin → reduced effect

B) METFORMIN (Biguanide) — DRUG OF CHOICE for Type 2 DM

MOA:

Activates AMPK → decreases hepatic gluconeogenesis (main action)
Increases peripheral glucose uptake
Reduces intestinal glucose absorption
Does NOT stimulate insulin secretion → no hypoglycemia risk

Dose: 500 mg BD–TDS with meals; max 2000–3000 mg/day

Route: Oral

Indications: Type 2 DM (first-line), polycystic ovarian syndrome (PCOS), pre-diabetes, obesity with DM

Contraindications: Renal impairment (GFR < 30), hepatic failure, heart failure, contrast media use (hold 48 hr), alcoholism, pregnancy

Side Effects:

GI upset — nausea, vomiting, diarrhea, metallic taste (common, especially initial)
Lactic acidosis — rare but serious, can be fatal
Vitamin B12 deficiency (long-term use)
Weight neutral

Drug Interactions: Alcohol potentiates lactic acidosis; contrast media → withhold before procedures

Nursing Role: Take with food to reduce GI side effects; monitor renal function; hold before contrast procedures; monitor B12 levels

C) PIOGLITAZONE (Thiazolidinedione)

MOA: Binds PPAR-γ (nuclear receptor) → increases insulin sensitivity in muscle and fat → reduces insulin resistance

Dose: 15–45 mg OD

Route: Oral

Indications: Type 2 DM, insulin resistance syndromes

Contraindications: Heart failure, liver disease, bladder cancer (pioglitazone), pregnancy

Side Effects: Weight gain, fluid retention/edema, increased fracture risk (women), hepatotoxicity (rare), heart failure exacerbation

D) ACARBOSE (Alpha-glucosidase inhibitor)

MOA: Inhibits intestinal alpha-glucosidase enzyme → slows carbohydrate digestion → reduces postprandial glucose rise

Dose: 25–100 mg TDS with first bite of each meal

Indications: Type 2 DM (especially postprandial hyperglycemia)

Side Effects: Flatulence, bloating, diarrhea (due to undigested CHO fermentation in colon)

Note: Hypoglycemia only if combined with sulfonylurea; treat with glucose (NOT sucrose)

E) SITAGLIPTIN (DPP-4 Inhibitor / Gliptin)

MOA: Inhibits DPP-4 enzyme → prevents breakdown of incretin hormones (GLP-1, GIP) → increased insulin secretion in glucose-dependent manner + reduced glucagon → weight neutral

Dose: 100 mg OD

Side Effects: Nasopharyngitis, pancreatitis (rare), joint pain

F) DAPAGLIFLOZIN (SGLT-2 Inhibitor)

MOA: Blocks sodium-glucose co-transporter-2 in proximal tubule → increases urinary glucose excretion (glucosuria) → reduces blood glucose

Additional Benefits: Cardiovascular protection, heart failure benefit, weight loss, BP reduction

Side Effects: UTI, genital fungal infections, polyuria, euglycemic DKA (rare), Fournier's gangrene

SECTION 2: THYROID & ANTI-THYROID DRUGS

🔷 THYROID HORMONES (Replacement)

Types

Levothyroxine (T4) — drug of choice
Liothyronine (T3) — faster acting
Desiccated thyroid — natural (combined T3+T4)

Mechanism of Action

Enter cells via transporters (MCT8) → T4 converted to active T3 by 5'-deiodinase
T3 binds nuclear thyroid hormone receptor (α and β subtypes)
Activates gene transcription → protein synthesis
Effects: increased BMR, cardiac output, O₂ consumption, CNS development, thermogenesis

Dosage & Route

Levothyroxine: 25–100 mcg/day orally (start low in elderly/cardiac patients); target: normalize TSH
Liothyronine: 25–75 mcg/day; used in myxedema coma (IV)
Route: Oral (standard), IV (emergency)

Indications

Hypothyroidism (primary, secondary, post-thyroidectomy)
Myxedema coma (IV liothyronine or levothyroxine)
Goiter (TSH suppression)
Thyroid cancer (post-surgery, high-dose to suppress TSH)
Cretinism (congenital hypothyroidism) — early treatment essential

Contraindications

Untreated adrenal insufficiency (risk of adrenal crisis)
Thyrotoxicosis (untreated)
Hypersensitivity
Caution: cardiovascular disease (start with low dose)

Drug Interactions

Drug	Effect
Calcium, iron, antacids	Reduce absorption — take levothyroxine on empty stomach, 4 hr apart
Warfarin	Thyroid hormone increases warfarin effect → bleeding risk
Cholestyramine	Binds T4, reduces absorption
Rifampicin, phenytoin	Increase T4 metabolism → hypothyroidism
Beta-blockers	Reduce conversion of T4 to T3

Side Effects / Adverse Effects / Toxicity

Symptoms of hyperthyroidism (overdose): palpitations, tachycardia, angina, tremors, weight loss, heat intolerance, insomnia, diarrhea
In elderly: atrial fibrillation with excess dosing
In children: craniosynostosis with overdose

Nursing Role

Give levothyroxine on empty stomach, 30–60 min before breakfast
Separate from calcium, iron supplements by 4 hours
Monitor TSH levels every 6–8 weeks initially, then annually
Educate patient: take medication for life, never stop suddenly
Monitor heart rate & blood pressure
Advise patient: effects take several weeks to manifest

🔷 ANTI-THYROID DRUGS

Classification

Thioamides: Methimazole (Carbimazole), Propylthiouracil (PTU)
Iodine & Iodides: Lugol's iodine, Potassium iodide, SSKI
Radioactive iodine: ¹³¹I
Adjuncts: Beta-blockers (Propranolol), Glucocorticoids, Lithium

A) METHIMAZOLE (MMI) / CARBIMAZOLE — DRUG OF CHOICE

Mechanism of Action:

Inhibits thyroid peroxidase (TPO) enzyme
Blocks organification of iodide → prevents synthesis of T3 and T4
Carbimazole is a prodrug → converted to methimazole in body
Does NOT block release of stored hormone

Dose: 20–40 mg/day initially; maintenance 5–15 mg/day

Route: Oral

Indications:

Hyperthyroidism (Graves' disease — first choice)
Pre-operative preparation before thyroidectomy
Thyroid storm (combined with propranolol, iodine, steroids)

Contraindications: Severe agranulocytosis history; caution in pregnancy (crosses placenta)

Side Effects:

Agranulocytosis (most dangerous — 0.5%) — sore throat, fever → STOP drug, check WBC
Skin rash, urticaria
Nausea, vomiting
Arthralgia, myalgia
Hypothyroidism (overdose)
Hepatotoxicity (rare)

B) PROPYLTHIOURACIL (PTU)

MOA:

Inhibits TPO → blocks T3/T4 synthesis (same as MMI)
Also inhibits peripheral conversion of T4 → T3 (additional action via deiodinase inhibition)
This makes PTU preferred in thyroid storm and first trimester of pregnancy

Dose: 100–150 mg every 8 hr; maintenance 50–100 mg BD

Route: Oral

Indications: Hyperthyroidism, thyroid storm (preferred), first trimester of pregnancy

Side Effects: Similar to MMI + hepatotoxicity (more risk than MMI — serious)

C) IODINE & IODIDES (Lugol's Iodine, Potassium Iodide)

MOA:

Wolff-Chaikoff effect — high iodide inhibits thyroid peroxidase transiently → reduces synthesis
Plummer effect — high iodide inhibits release of stored thyroid hormones → reduces T3/T4 secretion quickly
Reduces thyroid vascularity (used pre-surgery)

Uses: Pre-operative preparation (given 10 days before thyroidectomy), thyroid storm, prophylaxis after nuclear radiation exposure

Side Effects: Iodism — metallic taste, burning in mouth, salivary gland swelling, acneiform rash, rhinorrhea

Contraindication: Toxic nodular goiter (may worsen)

D) RADIOACTIVE IODINE (¹³¹I)

MOA: Taken up by thyroid cells → emits beta radiation → destroys thyroid follicular cells → ablation of thyroid tissue

Route: Oral (capsule or liquid)

Indications: Graves' disease (adults), thyroid cancer (post-surgery ablation), hyperthyroidism recurrence

Contraindications: Pregnancy (absolute), breastfeeding, children (relative), Graves' ophthalmopathy (can worsen)

Side Effects: Hypothyroidism (most common), radiation thyroiditis, temporary sialitis (salivary gland), neck tenderness

Nursing Role for Radioactive Iodine:

Patient must be isolated (radiation precautions) for 1–3 days
Separate utensils, flush toilet twice
Avoid contact with pregnant women and children
Monitor for signs of hypothyroidism post-treatment
Advise women to avoid pregnancy for 6 months

E) PROPRANOLOL (Beta-blocker — Adjunct)

MOA: Blocks sympathetic effects of thyroid hormones; also inhibits peripheral T4 → T3 conversion

Uses: Symptomatic relief in hyperthyroidism — controls tachycardia, tremors, anxiety, palpitations; key drug in thyroid storm

Dose: 40–80 mg every 6–8 hr (thyroid storm: IV)

THYROID STORM — Quick Nursing Points

Medical emergency
Drugs: PTU (block synthesis) + Lugol's iodine (given 1 hr AFTER PTU) + Propranolol + Dexamethasone + supportive care
Monitor temperature, heart rate, consciousness
Cooling measures, IV fluids

SECTION 3: STEROIDS

🔶 A) CORTICOSTEROIDS

Classification

Type	Examples
Glucocorticoids	Cortisol (hydrocortisone), Prednisolone, Dexamethasone, Betamethasone, Triamcinolone, Budesonide
Mineralocorticoids	Aldosterone, Fludrocortisone
Mixed	Cortisone (has both)

Potency Comparison (anti-inflammatory)

Dexamethasone (25) > Betamethasone (25) > Triamcinolone (5) > Prednisolone (4) > Hydrocortisone (1)

Mechanism of Action

Bind to intracellular glucocorticoid receptor (GR)
GR-drug complex enters nucleus → binds glucocorticoid response elements (GRE) → alters gene transcription
Anti-inflammatory: Induces lipocortin → inhibits phospholipase A₂ → reduces arachidonic acid → reduces prostaglandins, leukotrienes, cytokines
Stabilizes mast cell membranes, reduces capillary permeability
Immunosuppressive: Reduces lymphocyte proliferation, antibody production
Metabolic: Increases blood glucose (gluconeogenesis), protein catabolism, fat redistribution
Mineralocorticoid effect: Sodium retention, potassium loss (varies by drug)

Dosage & Routes

Route	Examples
Oral	Prednisolone 5–60 mg/day
IV/IM	Hydrocortisone 100–500 mg (emergency)
Inhalation	Budesonide, Beclomethasone (asthma)
Topical	Betamethasone cream (skin)
Intra-articular	Triamcinolone (joints)
Epidural	Pain management

Indications

Asthma & COPD (inhaled/systemic)
Rheumatoid arthritis, SLE, inflammatory bowel disease
Nephrotic syndrome, minimal change disease
Allergic reactions, anaphylaxis (adjunct to epinephrine)
Organ transplant (immunosuppression)
Adrenal insufficiency / Addison's disease (replacement)
Meningitis (dexamethasone reduces CNS inflammation)
Cerebral edema (dexamethasone)
Fetal lung maturity (betamethasone — given to mother at 24–34 weeks)
Thyroid storm (blocks T4→T3 conversion)

Contraindications

Systemic fungal infections (absolute)
Active tuberculosis (relative)
Active peptic ulcer
Uncontrolled diabetes
Live vaccines (during immunosuppressive therapy)
Psychosis history

Drug Interactions

Drug	Interaction
NSAIDs	Increased GI ulceration risk
Antidiabetics	Antagonize glycemic control
Diuretics (thiazides, furosemide)	Additive hypokalemia
Warfarin	Unpredictable effect on anticoagulation
Rifampicin, phenytoin	Increase steroid metabolism → reduce effect
Live vaccines	Risk of disseminated infection

Side Effects / Adverse Effects (LONG-TERM USE)

Mnemonic: "CUSHINGOID"

System	Effect
C — Cushing's syndrome	Moon face, buffalo hump, central obesity
U — Ulcers (peptic)	GI erosions
S — Skin changes	Striae, bruising, thin skin, acne
H — Hyperglycemia	Steroid-induced diabetes
I — Immunosuppression	Opportunistic infections
N — Na⁺ retention + Hypertension	Fluid retention, edema
G — Growth retardation	In children
O — Osteoporosis	Fracture risk; calcium + Vitamin D supplement
I — Increased weight + Cataracts	Eye complications
D — Depression / Mood disorders	Psychosis (high dose)

HPA Axis Suppression — Adrenal insufficiency on sudden withdrawal → Addisonian crisis

NEVER stop steroids abruptly — must taper gradually

Toxicity / Steroid Withdrawal

Abrupt withdrawal → Addisonian crisis = hypotension, hypoglycemia, hyponatremia, hyperkalemia, collapse
Always taper the dose gradually

Role of Nurse

Never stop steroids suddenly — educate patient
Give oral steroids with food or milk (reduces GI irritation)
Monitor blood pressure, blood glucose, weight, serum electrolytes
Monitor for signs of infection (masked by steroid)
Advise patient to carry steroid card / medic-alert bracelet
Administer with calcium + Vitamin D supplements to prevent osteoporosis
Monitor eye pressure (risk of glaucoma/cataracts)
Teach proper inhaler technique (rinse mouth after inhaled steroids — prevents oral candidiasis)

🔶 B) ANABOLIC STEROIDS

Examples

Testosterone, Nandrolone, Stanozolol, Oxandrolone, Danazol, Testosterone esters (Cypionate, Enanthate)

Mechanism of Action

Synthetic derivatives of testosterone
Bind to androgen receptor in nucleus → increase protein synthesis (anabolic effect), nitrogen retention, muscle mass
Promote growth of male secondary sex characteristics (androgenic effect)
Stimulate erythropoiesis via EPO production

Dosage & Route

Testosterone: 50–400 mg IM every 2–4 weeks (testosterone enanthate/cypionate)
Nandrolone: 50–200 mg IM every 1–4 weeks
Stanozolol: 2–6 mg/day oral
Oxandrolone: 2.5–20 mg/day oral

Indications (Medical Use)

Hypogonadism in males (testosterone replacement)
Delayed puberty in boys
Anemia — aplastic anemia, anemia of chronic disease, renal anemia
Catabolic states — burns, major surgery, HIV wasting, prolonged illness
Hereditary angioedema (Danazol)
Osteoporosis (limited use)
Gender-affirming therapy (transgender men)

Contraindications

Prostate cancer or breast cancer in males
Pregnancy (virilization of female fetus)
Liver disease
Nephrotic syndrome
Children with open epiphyses (premature closure)
Polycythemia

Side Effects / Adverse Effects

In Males	In Females	Both
Testicular atrophy	Virilization (hirsutism, voice change, clitoromegaly)	Liver damage (peliosis hepatis, hepatocellular carcinoma)
Oligospermia, infertility	Menstrual irregularities	Dyslipidemia (↑LDL, ↓HDL)
Gynecomastia	Acne	Hypertension
Acne, baldness	Clitoral enlargement	Polycythemia
Priapism		Mood changes, aggression
		Edema

Abuse (Athletes): Doping — rapid muscle gain at the cost of serious long-term side effects including sudden cardiac death

Drug Interactions

Warfarin — potentiates anticoagulation effect → bleeding risk
Insulin/oral hypoglycemics — may potentiate hypoglycemic effect
Hepatotoxic drugs — additive liver toxicity

Nursing Role

Monitor liver function tests (LFTs)
Monitor lipid profile (cholesterol)
Monitor hematocrit (polycythemia risk)
Educate about dangers of abuse
Monitor for signs of virilization in female patients
Advise males regarding gynecomastia and testicular effects
Report mood changes, aggression

SECTION 4: CALCITONIN, PARATHORMONE, VITAMIN D3 & CALCIUM METABOLISM

🔷 CALCIUM METABOLISM — Overview

Regulator	Source	Effect on Ca²⁺	Effect on Phosphate
PTH	Parathyroid gland	↑ Blood Ca²⁺	↓ Blood PO₄ (phosphaturia)
Calcitonin	Thyroid C-cells	↓ Blood Ca²⁺	↓ Blood PO₄
Vitamin D3 (Calcitriol)	Skin/diet→liver→kidney	↑ Blood Ca²⁺ & PO₄	↑ Blood PO₄

Normal Serum Ca²⁺: 8.5–10.5 mg/dL Hypocalcemia: < 8.5 mg/dL → Tetany, Chvostek's sign, Trousseau's sign Hypercalcemia: > 10.5 mg/dL → Stones, Bones, Groans, Psychic moans (mnemonic)

🔷 A) CALCITONIN

Source

Secreted by parafollicular C-cells of thyroid gland

Mechanism of Action

Binds to calcitonin receptors on osteoclasts → inhibits osteoclast activity → reduces bone resorption
Increases urinary excretion of Ca²⁺ and phosphate (renal tubular effect)
Net effect: LOWERS blood calcium

Preparations

Salmon calcitonin (Miacalcin) — more potent than human; parenteral and nasal spray
Human calcitonin — less potent

Dosage & Route

Osteoporosis: Nasal spray 200 IU once daily (alternating nostrils)
Hypercalcemia: 4 units/kg SC/IM every 12 hr
Paget's disease: 50–100 IU SC/IM daily

Indications

Hypercalcemia (acute management)
Osteoporosis (second line, in post-menopausal women especially with spinal pain)
Paget's disease of bone (deformity, pain, bone overgrowth)
Osteolytic metastases (bone pain)

Contraindications

Hypocalcemia
Hypersensitivity to calcitonin or salmon protein

Side Effects

Nausea, vomiting, facial flushing (common with injections)
Rhinitis (nasal spray)
Hypocalcemia (overdose)
Antibody formation with long-term use → tachyphylaxis (escape phenomenon)
Possible increased cancer risk with long-term nasal use (FDA warning)

Drug Interactions

Lithium — calcitonin can reduce lithium levels
Calcium supplements — give calcium + Vitamin D alongside for osteoporosis treatment

Nursing Role

Skin test before first dose (allergic reaction risk with salmon calcitonin)
Rotate injection sites; inject SC or IM
Teach nasal spray technique: alternate nostrils daily
Monitor serum Ca²⁺ levels
Administer at bedtime to reduce nausea
Store nasal spray at room temperature after opening

🔷 B) PARATHORMONE (PTH) / TERIPARATIDE

Source

Parathyroid glands (4 glands, behind thyroid)

Mechanism of Action — Endogenous PTH

Bone: Stimulates osteoclasts → bone resorption → ↑ Ca²⁺
Kidney: Increases Ca²⁺ reabsorption, decreases phosphate reabsorption (phosphaturia), activates 25-OH D → 1,25 (OH)₂ D (calcitriol)
Intestine: Indirectly increases Ca²⁺ absorption via calcitriol
Net: ↑ Blood Ca²⁺, ↓ Blood Phosphate

Pharmacological Use — TERIPARATIDE (Recombinant PTH 1-34)

Mechanism (intermittent dosing): Intermittent PTH stimulates osteoblast activity > osteoclast activity → net bone formation (anabolic effect on bone) (Continuous PTH → more osteoclast activity → bone resorption)

Dosage & Route

20 mcg SC once daily into abdomen or thigh
Treatment duration: Maximum 2 years (lifetime)

Indications

Severe osteoporosis — post-menopausal women, men at high fracture risk
Glucocorticoid-induced osteoporosis
When bisphosphonates have failed

Contraindications

Paget's disease (risk of osteosarcoma)
Prior bone radiation
Bone metastases
Hypercalcemia
Children (open growth plates)
Osteosarcoma history (black box warning)

Side Effects

Osteosarcoma (black box warning — dose/duration dependent in rat studies)
Hypercalcemia
Nausea, leg cramps
Dizziness, orthostatic hypotension (after first dose)
Hyperuricemia

Nursing Role

Administer SC; teach patient self-injection
Monitor serum Ca²⁺, phosphate, alkaline phosphatase
Monitor for signs of hypercalcemia (nausea, vomiting, constipation, confusion)
First injection in clinic (observe for dizziness/syncope for 15 min)
Store pen refrigerated; discard after 28 days
Maximum 2-year treatment course only

🔷 C) VITAMIN D3 (CHOLECALCIFEROL / CALCITRIOL)

Forms

Form	Name	Activity
Vitamin D2	Ergocalciferol	Inactive (from plants)
Vitamin D3	Cholecalciferol	Inactive (from skin, diet)
25-OH D3	Calcidiol	Inactive; storage form (measured in blood)
1,25(OH)₂D3	Calcitriol	Active form
Alfacalcidol (1-α-OHD3)	Synthetic	Requires only hepatic activation

Synthesis Pathway

Skin (UV) → Cholecalciferol (D3) → Liver (25-hydroxylation) → Calcidiol → Kidney (1-α-hydroxylation by PTH) → Calcitriol (active)

Mechanism of Action

Calcitriol binds Vitamin D receptor (VDR) in nucleus (same family as steroid/thyroid receptors)
Intestine: Increases Ca²⁺ and phosphate absorption (main action)
Kidney: Increases Ca²⁺ and phosphate reabsorption
Bone: Stimulates bone mineralization; also promotes osteoclast activity (Ca²⁺ mobilization)
Net: ↑ Blood Ca²⁺ and Phosphate

Dosage & Route

Preparation	Dose	Route
Cholecalciferol (D3)	1000–4000 IU/day (maintenance)	Oral
Ergocalciferol (D2)	50,000 IU/week (deficiency)	Oral
Calcitriol	0.25–1 mcg/day	Oral/IV
Alfacalcidol	0.25–1 mcg/day	Oral

Indications

Vitamin D deficiency, rickets (children), osteomalacia (adults)
Osteoporosis (with calcium)
Hypoparathyroidism
Renal osteodystrophy (use calcitriol/alfacalcidol — bypass kidney activation)
Chronic renal failure
Malabsorption syndromes
Rickets prevention in neonates

Contraindications

Hypercalcemia, hypervitaminosis D
Hypercalciuria (renal stone disease)
Sarcoidosis (already hypersensitive to Vit D)

Side Effects (usually toxicity from overdose)

Hypercalcemia: nausea, vomiting, polyuria, polydipsia, constipation, weakness
Metastatic calcification: deposits in kidneys (nephrocalcinosis), vessels, soft tissues
Hypercalciuria → kidney stones

Drug Interactions

Thiazide diuretics — increase risk of hypercalcemia (reduce renal excretion)
Digoxin — hypercalcemia potentiates digoxin toxicity
Antiepileptics (phenytoin, phenobarb) — increase Vitamin D catabolism → deficiency
Cholestyramine — reduces Vit D absorption

Nursing Role

Monitor serum Ca²⁺, phosphate, and urinary Ca²⁺
Monitor for signs of hypercalcemia toxicity
Give with meals to improve absorption
Ensure adequate hydration
Advise sun exposure (15–30 min/day)
Educate about dietary sources (dairy, fish, eggs)

🔷 D) CALCIUM SALTS

Common Preparations

Salt	Ca²⁺ Content	Use
Calcium carbonate	40% elemental Ca	Supplement, antacid
Calcium gluconate	9%	IV in hypocalcemia (preferred IV)
Calcium chloride	27%	IV cardiac arrest
Calcium citrate	21%	Better absorbed (renal stone patients)
Calcium lactate	13%	Oral supplement

Mechanism of Action

Calcium is essential for: membrane potential, muscle contraction (cardiac, skeletal), nerve transmission, blood coagulation, enzyme function, bone mineralization
Calcium gluconate IV → rapidly raises ionized Ca²⁺ → stabilizes cardiac membranes

Dosage & Route

Oral supplement: 500–2000 mg elemental Ca/day (in divided doses)
IV Calcium Gluconate 10%: 10–20 mL slowly IV over 10 min (for hypocalcemia/tetany)
IV Calcium Chloride 10%: 5–10 mL IV (cardiac arrest, hyperkalemia, hypermagnesemia)

Indications

Hypocalcemia — tetany, post-thyroidectomy, hypoparathyroidism
Osteoporosis (prevention & treatment — with Vit D)
Cardiac arrest — calcium chloride (hyperkalemia-induced, hypermagnesemia)
Rickets, osteomalacia
Fluoride poisoning (IV calcium precipitates fluoride)
Antacid (calcium carbonate)

Contraindications

Hypercalcemia
Hypercalciuria (renal stone disease)
Digitalized patients (IV calcium → risk of cardiac arrhythmias)
Severe renal impairment

Drug Interactions

Drug	Effect
Digoxin	Hypercalcemia potentiates digoxin toxicity → arrhythmias
Tetracycline, fluoroquinolones	Calcium chelates → reduced antibiotic absorption (take 2 hr apart)
Iron	Calcium reduces iron absorption
Levothyroxine	Calcium reduces absorption (separate by 4 hr)
Thiazide diuretics	Reduce Ca²⁺ excretion → hypercalcemia risk
Bisphosphonates	Calcium reduces absorption (separate by 2 hr)

Side Effects

Oral: Constipation, bloating, flatulence, nausea (especially carbonate)
IV (too rapid): Bradycardia, cardiac arrest, hypotension, arrhythmias
Hypercalcemia (overdose)
Milk-alkali syndrome (excess calcium carbonate with dairy)
Kidney stones (hypercalciuria)

Nursing Role

IV Calcium Gluconate: Administer SLOWLY (10 mL over 10 min minimum); monitor ECG
Never give IV calcium in same line as bicarbonate (precipitates)
Monitor serum Ca²⁺, ECG, vital signs
Calcium carbonate: give with meals (needs acid for absorption)
Calcium citrate: can be given without food (does not need acid)
Educate about dietary Ca²⁺ sources: dairy, leafy greens, nuts
Monitor for signs of hypercalcemia in patients on calcium + Vit D therapy
Space away from other medications (antibiotics, levothyroxine, iron, bisphosphonates)
Monitor for constipation; encourage fluids and fiber

📋 QUICK REVISION TABLES

Table 1: Insulin Types — One Line Each

Drug	Duration	Key Point
Lispro/Aspart	3–5 hr	Give at mealtime or just after
Regular (Actrapid)	6–8 hr	Only insulin for IV use
NPH	12–18 hr	Cloudy; mix last when mixing
Glargine	24 hr	Clear, NEVER mix; once daily bedtime
Detemir	20–24 hr	Flexible timing
Degludec	~42 hr	Ultra long, flexible timing

Table 2: Oral Hypoglycemics Comparison

Drug	MOA	Hypoglycemia?	Weight	Key Concern
Sulfonylurea	↑ Insulin secretion	YES	↑	Hypoglycemia
Metformin	↓ Gluconeogenesis	No	Neutral	Lactic acidosis
Pioglitazone	↑ Insulin sensitivity	No	↑	Heart failure
Acarbose	↓ CHO absorption	No	Neutral	GI bloating
Sitagliptin	↑ Incretin	No	Neutral	Pancreatitis
Dapagliflozin	↑ Glycosuria	No	↓	UTI/genital infection

Table 3: Anti-thyroid Drug Comparison

Drug	MOA	Special Use	Key Toxicity
Methimazole	Block TPO	Drug of choice	Agranulocytosis
PTU	Block TPO + T4→T3	Pregnancy 1st trimester, Thyroid storm	Hepatotoxicity
Lugol's iodine	↓ Release	Pre-op, thyroid storm	Iodism
¹³¹I	Cell ablation	Definitive (adults)	Hypothyroidism
Propranolol	Blocks symptoms	Adjunct	Bronchospasm

Table 4: Calcium Regulators — 3 Drugs

Drug	↑ or ↓ Ca²⁺	Bone Effect	Key Use
PTH/Teriparatide	↑	Anabolic (intermittent)	Severe osteoporosis
Calcitonin	↓	Anti-resorptive	Hypercalcemia, Paget's
Vitamin D3 (Calcitriol)	↑	Mineralization	Rickets, Osteomalacia

Table 5: Corticosteroid Side Effects — CUSHINGOID Mnemonic

Letter	Effect
C	Cushing's features (moon face, buffalo hump, striae)
U	Ulcer (peptic ulcer, GI bleeding)
S	Skin changes (thin, bruise easily, acne, poor healing)
H	Hyperglycemia / Hypertension
I	Immunosuppression (opportunistic infections)
N	Na⁺ retention, edema
G	Growth retardation (children)
O	Osteoporosis + Ocular (cataracts, glaucoma)
I	Increased appetite + weight gain
D	Depression, psychosis (mood disorders)

✅ NURSE'S ROLE — EXAM-FOCUSED SUMMARY

Drug Category	Key Nursing Points
Insulin	Check BG before dose; use insulin syringe; rotate sites; monitor hypoglycemia; store in refrigerator
Oral Hypoglycemics	Metformin with food; hold before contrast; sulfonylureas → watch hypoglycemia
Thyroid drugs	Empty stomach; 30 min before breakfast; separate from Ca/Fe by 4 hr; monitor TSH
Anti-thyroid	Watch for sore throat/fever (agranulocytosis); never stop suddenly; radiation precautions for ¹³¹I
Corticosteroids	Never stop abruptly; give with food; carry steroid card; take Ca + Vit D; monitor glucose/BP
Anabolic steroids	Monitor LFTs, lipids, hematocrit; educate about abuse risks; watch virilization in females
Calcitonin	Skin test first; bedtime dose; alternate nostrils (nasal spray); monitor Ca²⁺
Teriparatide	SC injection; first dose in clinic; max 2 years; monitor Ca²⁺; refrigerate pen
Vitamin D	Monitor Ca²⁺; calcitriol in renal failure; sun exposure; avoid overdose
Calcium IV	Slow IV infusion; ECG monitoring; never with bicarb; monitor bradycardia

Unit VI ke puri Endocrine Drugs ki complete exam-ready notes taiyaar hain! 🎯

Yeh notes cover karti hain:

Kya-kya cover hua hai:

1. Insulin & Oral Hypoglycemics

Insulin ke 6 types (Rapid, Short, Intermediate, Long, Ultra-long, Premixed) — onset/peak/duration table
Metformin (drug of choice) — lactic acidosis warning
Sulfonylurea, Pioglitazone, Acarbose, Sitagliptin, Dapagliflozin — har ek ka MOA, dose, side effects
Comparison table with hypoglycemia risk & weight effect

2. Thyroid & Anti-thyroid Drugs

Levothyroxine — mechanism, interactions (Ca, Fe separate karo), nursing
Methimazole vs PTU — kab kaunsa use karo (pregnancy, thyroid storm)
Lugol's iodine, Radioactive ¹³¹I — radiation precautions
Thyroid Storm management complete

3. Steroids

Corticosteroids — CUSHINGOID mnemonic for all side effects
Never stop abruptly — Addisonian crisis warning
Anabolic steroids — virilization, hepatotoxicity, abuse risks
Drug interactions table

4. Calcium Metabolism

Calcitonin — skin test, bedtime dose, tachyphylaxis
Teriparatide (PTH) — osteosarcoma black box warning, max 2 years
Vitamin D3 pathway (Skin → Liver → Kidney → Active Calcitriol)
Calcium salts — IV calcium slow injection, ECG monitoring, never with bicarb

5. Nurse's Role

Har drug category ke liye separate nursing points — exam mein seedha likho

Tip: Quick Revision Tables (5 tables) baar baar padho — inme exam ke har important comparison aata hai.

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