Endocrine Pharmacology Practice Questions

Q: Long-term ingestion of steroids leads to all of the following except?

Glaucoma. **Explanation:** The correct answer is **C. Glaucoma**. This is a "trick" question common in NEET-PG, as it hinges on the distinction between **long-term systemic ingestion** versus **topical/local** administration of steroids. 1. **Why Glaucoma is the correct answer:** While steroids *can* cause glaucoma, it is primarily associated with **topical ophthalmic use** (eye drops) or periocular injections. Systemic (oral/IV) steroids are much more likely to cause cataracts than glaucoma. In the context of "long-term ingestion" (systemic route), glaucoma is the least common complication among the choices provided. 2. **Analysis of Incorrect Options:** * **Avascular Necrosis (AVN):** This is a classic, serious complication of long-term systemic steroid use. It most commonly affects the femoral head due to fat emboli or increased intraosseous pressure. * **Cataract:** Systemic steroids are a well-known cause of **Posterior Subcapsular Cataracts (PSC)**. This is a dose- and duration-dependent side effect. * **Growth Retardation:** In pediatric patients, chronic steroid use inhibits growth hormone (GH) secretion and has direct inhibitory effects on the epiphyseal plates, leading to stunted linear growth. **High-Yield Clinical Pearls for NEET-PG:** * **Cataract vs. Glaucoma:** Systemic steroids → Cataract (PSC); Topical steroids → Glaucoma. * **Withdrawal:** Long-term use (>2 weeks) requires tapering to prevent **Acute Adrenal Insufficiency** (due to HPA axis suppression). * **Metabolic Effects:** Steroids cause hyperglycemia (steroid-induced diabetes), osteoporosis, and centripetal obesity (Cushingoid features). * **Psychiatric:** "Steroid psychosis" can occur even with short-term high doses.

Q: Which of the following is a known side effect of Bromocriptine when used for lactation suppression?

It can cause hypotension.. **Explanation:** **Bromocriptine** is a semi-synthetic ergot alkaloid that acts as a potent **D2 receptor agonist** [4]. In the pituitary, it inhibits the release of prolactin, making it effective for treating hyperprolactinemia and, historically, for lactation suppression [1]. **Why Option B is Correct:** Bromocriptine causes **hypotension** (specifically postural/orthostatic hypotension) due to its central effect on the vasomotor center and its peripheral vasodilatory action via dopamine receptors. In the context of postpartum lactation suppression, this risk is significant, as it has been associated with rare but severe cardiovascular events like myocardial infarction and stroke, leading to its decline in use for this specific indication [2]. **Analysis of Incorrect Options:** * **Option A:** Bromocriptine does not cause DVT. In fact, ergot derivatives are more commonly associated with vasoconstriction and, in chronic cases, retroperitoneal or pulmonary fibrosis. * **Option C:** Metoclopramide is a **D2 receptor antagonist**. Therefore, it would **antagonize** (block) the effects of Bromocriptine, not potentiate them. * **Option D:** When used for lactation suppression, Bromocriptine must be administered for **2 weeks**. If stopped after only 1 week, "rebound lactation" often occurs because prolactin levels rise again [1]. **High-Yield NEET-PG Pearls:** * **Drug of Choice (DOC):** For both lactation suppression and prolactinomas, **Cabergoline** is now preferred over Bromocriptine due to its higher efficacy, longer half-life (twice-weekly dosing), and better side-effect profile [3]. * **Other Uses:** Bromocriptine is also used in **Parkinson’s disease** and **Acromegaly** (though it is less effective than Octreotide) [3]. * **Key Side Effects:** Nausea/vomiting (due to CTZ stimulation), digital vasospasm, and hallucinations [2].

Q: Long term administration of glucocorticoids can cause all of the following except?

Hyperkalemia. **Explanation:** The correct answer is **Hyperkalemia** because glucocorticoids actually cause **hypokalemia**, not hyperkalemia. **1. Why Hyperkalemia is the correct answer (The Exception):** Glucocorticoids (like Prednisolone or Dexamethasone) possess varying degrees of mineralocorticoid activity. They act on the distal renal tubules to promote the reabsorption of sodium and water in exchange for the excretion of potassium ($K^+$) and hydrogen ions ($H^+$). This physiological process leads to **hypokalemia** and metabolic alkalosis. Therefore, hyperkalemia is not a side effect of glucocorticoid therapy. **2. Why the other options are incorrect (Side effects of long-term use):** * **Proximal Myopathy (A):** Glucocorticoids are catabolic. They cause muscle protein breakdown and inhibit glucose uptake in muscles, leading to "steroid myopathy," typically affecting the proximal muscles of the limbs. * **Hypertension (C):** This occurs due to two mechanisms: the mineralocorticoid effect causing sodium/water retention and the enhancement of vascular reactivity to circulating catecholamines. * **Cataract (D):** Long-term use is a well-known risk factor for **posterior subcapsular cataracts**. It also increases intraocular pressure, potentially leading to glaucoma. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Steroid Side Effects:** "CUSHINGOID" (Cataracts, Ulcers, Skin thinning, Hypertension/Hirsutism, Immunosuppression, Necrosis of femoral head, Glucose elevation, Osteoporosis, Impaired wound healing, Depression/Psychosis). * **Osteoporosis:** Glucocorticoids are the most common cause of drug-induced osteoporosis (they inhibit osteoblasts and decrease calcium absorption). * **Growth:** In children, they cause growth retardation by inhibiting GH secretion and affecting the epiphyseal plates.

Q: Which of the following drugs is responsible for the teratogenic effect shown in the image?

Carbimazole. ***Carbimazole*** - Causes **aplasia cutis congenita**, a characteristic teratogenic effect involving congenital absence of skin, typically on the scalp as shown in the image. - Also associated with **choanal atresia** and **esophageal atresia** when used during pregnancy, making it contraindicated in the first trimester. *Propylthiouracil* - Generally considered **safer in pregnancy**, especially during the first trimester compared to carbimazole. - Does not typically cause **aplasia cutis congenita** and is the preferred antithyroid drug for pregnant women with hyperthyroidism. *Valproate* - Causes **neural tube defects** (spina bifida) and **fetal valproate syndrome** with characteristic facial dysmorphism. - Associated with developmental delays and autism spectrum disorders, but not aplasia cutis congenita. *Phenytoin* - Causes **fetal hydantoin syndrome** characterized by growth retardation, microcephaly, and distinctive facial features. - May cause **cleft lip/palate** and cardiac defects, but does not typically result in skin aplasia.

Q: Which of the following drugs is an aromatase inhibitor?

Letrozole. **Explanation:** **Correct Answer: D. Letrozole** **Mechanism of Action:** Aromatase is the enzyme responsible for the final rate-limiting step in estrogen synthesis—the conversion of androgens (androstenedione and testosterone) into estrogens (estrone and estradiol). **Letrozole** is a potent, non-steroidal, competitive **aromatase inhibitor**. By blocking this enzyme, it significantly lowers circulating estrogen levels. It is primarily used in the treatment of hormone-responsive breast cancer in postmenopausal women and for ovulation induction in infertility. **Analysis of Incorrect Options:** * **A & B (Raloxifene and Tamoxifen):** These are **SERMs (Selective Estrogen Receptor Modulators)**. They do not inhibit estrogen production; instead, they bind to estrogen receptors and act as either agonists or antagonists depending on the tissue. Tamoxifen is an antagonist in the breast but an agonist in the endometrium, while Raloxifene is an antagonist in both the breast and endometrium. * **C (Leuprolide):** This is a **GnRH analogue**. Continuous administration causes downregulation of GnRH receptors in the pituitary, leading to decreased FSH and LH, which ultimately suppresses ovarian/testicular steroidogenesis. **NEET-PG High-Yield Pearls:** * **Classification of Aromatase Inhibitors:** * **Type I (Irreversible/Steroidal):** Exemestane, Formestane. * **Type II (Reversible/Non-steroidal):** Letrozole, Anastrozole. * **Clinical Use:** Letrozole is now often preferred over Clomiphene citrate for **ovulation induction** in PCOS due to higher live birth rates and a better side effect profile (less thinning of the endometrium). * **Side Effects:** Unlike SERMs, aromatase inhibitors increase the risk of **osteoporosis** and fractures due to profound estrogen deprivation.

Q: L-Thyroxine is used in which of the following conditions?

Cretinism. **Explanation:** **L-Thyroxine (T4)** is the synthetic form of the thyroid hormone thyroxine. It is the drug of choice for hormone replacement therapy in all forms of hypothyroidism. **1. Why Cretinism is Correct:** Cretinism refers to **congenital hypothyroidism**, a condition where there is a severe deficiency of thyroid hormones from birth. Thyroid hormones are critical for brain development and skeletal growth. Immediate and lifelong replacement with L-Thyroxine is mandatory to prevent irreversible intellectual disability and growth retardation. T4 is preferred over T3 because of its longer half-life (7 days), consistent blood levels, and peripheral conversion to T3 as needed by tissues. **2. Why Other Options are Incorrect:** * **Thyroid Storm:** This is a life-threatening state of hyperthyroidism. Treatment involves **anti-thyroid drugs** (Propylthiouracil/Methimazole), beta-blockers, and iodine, not more thyroid hormone. * **Endemic Goiter:** This is usually caused by **iodine deficiency**. While T4 can shrink a goiter by suppressing TSH, the primary treatment and prevention strategy is iodine supplementation (e.g., iodized salt). * **Graves' Disease:** This is an autoimmune condition causing **hyperthyroidism**. It is treated with anti-thyroid drugs, radioactive iodine, or surgery—never L-Thyroxine (unless a "block and replace" regimen is used, which is not the primary indication). **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** L-Thyroxine is the DOC for Myxedema coma (given IV) and Hashimoto’s thyroiditis. * **Administration:** It should be taken on an **empty stomach** (30-60 minutes before breakfast) as food, calcium, and iron supplements interfere with its absorption. * **Monitoring:** The best parameter to monitor the efficacy of L-Thyroxine therapy in primary hypothyroidism is the **Serum TSH level**. * **Pregnancy:** Requirements for L-Thyroxine typically **increase** during pregnancy.

Q: Which of the following is a rapid-acting insulin?

Glulisine. **Explanation:** Insulin analogues are classified based on their onset and duration of action. **Glulisine** is a **rapid-acting insulin** analogue. It is designed to mimic the postprandial (after-meal) insulin spike. By modifying the amino acid sequence (replacing asparagine with lysine and lysine with glutamic acid), these analogues prevent the formation of hexamers, allowing for rapid absorption into the bloodstream. **Analysis of Options:** * **Glulisine (Correct):** Along with **Lispro** and **Aspart**, Glulisine has an onset of action within 5–15 minutes and a peak effect at 1 hour. It is ideal for bolus coverage during meals. * **Glargine & Detemir (Incorrect):** These are **long-acting (basal) insulin** analogues. They provide a steady, "peakless" level of insulin for approximately 24 hours to maintain glycemic control between meals and overnight. * **Lente (Incorrect):** This is an **intermediate-acting** insulin (human insulin zinc suspension). It has a slower onset and longer duration than regular insulin but has largely been replaced by NPH or long-acting analogues in modern pediatric practice. **High-Yield NEET-PG Pearls:** 1. **Mnemonic for Rapid-acting:** "No **L**ag" (**L**ispro, **A**spart, **G**lulisine). 2. **Route:** Rapid-acting analogues are the preferred choice for **Continuous Subcutaneous Insulin Infusion (CSII)** or insulin pumps. 3. **Site of Absorption:** Abdomen > Arm > Thigh > Buttock. 4. **Mixing:** Rapid-acting insulins can be mixed with NPH, but Glargine/Detemir should never be mixed in the same syringe as their acidic pH can cause precipitation.

Q: What is the advantage of desmopressin over vasopressin in the treatment of diabetes insipidus?

Is more selective for V2 receptor subtype. **Explanation:** **1. Why Option C is Correct:** Vasopressin (ADH) acts on two primary receptors: **V1** (located on vascular smooth muscle, causing vasoconstriction) and **V2** (located in the renal collecting ducts, causing water reabsorption). **Desmopressin (dDAVP)** is a synthetic analogue of vasopressin designed to be highly selective for the **V2 receptor**. By minimizing V1 activity, desmopressin effectively treats Diabetes Insipidus (DI) by concentrating urine without causing the unwanted systemic vasoconstriction (hypertension, angina, or abdominal cramps) associated with native vasopressin. It also has a significantly longer duration of action (6–20 hours) compared to vasopressin (2–8 hours). **2. Why Other Options are Wrong:** * **Option A:** Desmopressin actually **increases** the release of Factor VIII and von Willebrand factor from endothelial cells (via V2-like receptors). This makes it a treatment for Hemophilia A and von Willebrand Disease, not a disadvantage. * **Option B:** Both drugs treat DI, which helps correct hypernatremia. However, the primary risk of overdose with both is **hyponatremia** (due to excessive water retention), not hypernatremia. * **Option D:** While both drugs reduce polyuria and secondary thirst, desmopressin is preferred due to its **selectivity and duration**, not because it has a superior direct effect on the thirst center. **3. NEET-PG High-Yield Pearls:** * **Route of Choice:** Intranasal is common, but oral and IV/SC routes are available. * **Drug of Choice (DOC):** Desmopressin is the DOC for **Central Diabetes Insipidus** and **Nocturnal Enuresis**. * **V1 vs. V2:** Remember **V1 = Vascular** (Constriction); **V2 = Volume/Valves** (Water reabsorption and Factor VIII/vWF release). * **Terlipressin:** A V1-selective analogue used in esophageal varices.

Q: Bisphosphonates are used for which of the following conditions, EXCEPT?

Osteosclerosis. **Explanation:** **Bisphosphonates** (e.g., Alendronate, Zoledronate) are structural analogs of pyrophosphate that primarily act by inhibiting **osteoclasts**, the cells responsible for bone resorption. **Why Osteosclerosis is the Correct Answer:** **Osteosclerosis** is a condition characterized by an abnormal increase in bone density (hardening of bone). Since bisphosphonates inhibit bone breakdown and further increase bone mineral density, they would potentially worsen the condition or provide no therapeutic benefit. Therefore, they are not indicated here. **Analysis of Incorrect Options:** * **Osteoporosis (Option B):** This is the most common indication. Bisphosphonates are first-line drugs that decrease bone resorption, thereby increasing bone mass and reducing the risk of fractures. * **Osteolytic Bone Metastases (Option A):** Cancers (like breast or multiple myeloma) often cause "punched-out" lytic lesions by activating osteoclasts. Bisphosphonates (especially IV Zoledronate) inhibit this process, reducing bone pain and pathological fractures. * **Paget’s Disease (Option D):** This involves disordered, excessive bone remodeling. Bisphosphonates are the treatment of choice to suppress the overactive osteoclasts and normalize bone turnover. **NEET-PG High-Yield Pearls:** * **Mechanism:** They bind to hydroxyapatite crystals and inhibit the enzyme **FPPS (Farnesyl Pyrophosphate Synthase)** in the mevalonate pathway of osteoclasts. * **Administration:** Oral bisphosphonates must be taken on an empty stomach with a full glass of water, and the patient must remain upright for 30 minutes to prevent **erosive esophagitis**. * **Side Effects:** Osteonecrosis of the Jaw (ONJ) and atypical subtrochanteric fractures (with long-term use). * **Drug of Choice:** Zoledronate is the most potent bisphosphonate and is the drug of choice for **Hypercalcemia of Malignancy**.

Question 1

Long-term ingestion of steroids leads to all of the following except?

Accepted Answer

Glaucoma

Answer

Avascular necrosis of the head of the femur

Answer

Cataract

Answer

Growth retardation

Question 2

Which of the following is a known side effect of Bromocriptine when used for lactation suppression?

Accepted Answer

It can cause hypotension.

Answer

It can cause deep vein thrombosis.

Answer

Metoclopramide potentiates the action of Bromocriptine.

Answer

It is given for 1 week only.

Question 3

Steroids cause all of the following except:

Accepted Answer

Decreased bone matrix formation

Answer

Decreased healing of the wound

Answer

Water retention

Answer

None of the above

Question 4

Long term administration of glucocorticoids can cause all of the following except?

Accepted Answer

Hyperkalemia

Answer

Proximal myopathy

Answer

Hypertension

Answer

Cataract

Question 5

Which of the following drugs is responsible for the teratogenic effect shown in the image?

Accepted Answer

Carbimazole

Answer

Propylthiouracil

Answer

Valproate

Answer

Phenytoin

Question 6

Which of the following drugs is an aromatase inhibitor?

Accepted Answer

Letrozole

Answer

Raloxifine

Answer

Tamoxifen

Answer

Leuprolide

Question 7

L-Thyroxine is used in which of the following conditions?

Accepted Answer

Cretinism

Answer

Thyroid storm

Answer

Endemic goiter

Answer

Graves' disease

Question 8

Which of the following is a rapid-acting insulin?

Accepted Answer

Glulisine

Answer

Glargine

Answer

Detemir

Answer

Lente

Question 9

What is the advantage of desmopressin over vasopressin in the treatment of diabetes insipidus?

Accepted Answer

Is more selective for V2 receptor subtype

Answer

Causes less formation of factor VIII

Answer

Causes less hypernatremia

Answer

Provides greater relief of excessive thirst the patient is experiencing

Question 10

Bisphosphonates are used for which of the following conditions, EXCEPT?

Accepted Answer

Osteosclerosis

Answer

Osteolytic bone metastases

Answer

Osteoporosis

Answer

Paget's disease

Endocrine Pharmacology — MCQs

Endocrine Pharmacology — MCQs

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