Endocrine Pharmacology Practice Questions

Q: Finasteride is classified as a:

5-alpha reductase inhibitor. ### ***5-alpha reductase inhibitor*** - **Finasteride** specifically inhibits the enzyme **5-alpha reductase**, preventing the conversion of **testosterone** to **dihydrotestosterone (DHT)** [2], [4]. - This reduction in DHT is clinically useful for treating conditions like **benign prostatic hyperplasia (BPH)** and **androgenetic alopecia** [4]. ### *Phosphodiesterase inhibitor* - **Phosphodiesterase inhibitors** (e.g., sildenafil) typically work by increasing levels of **cyclic GMP**, leading to **vasodilation** and are used for **erectile dysfunction** [3]. - Their mechanism of action is distinct from finasteride's effect on **hormone metabolism**. ### *Alpha-1 blocker* - **Alpha-1 blockers** (e.g., tamsulosin) primarily relax **smooth muscle** in the prostate and bladder neck, improving **urine flow** in BPH [3], [5]. - They act on **adrenergic receptors** and do not affect **hormone synthesis** or **metabolism** [3]. ### *Androgen receptor antagonist* - **Androgen receptor antagonists** (e.g., flutamide) directly block the binding of **androgens** (like testosterone and DHT) to their receptors [1], [4]. - While they also affect androgen action, their mechanism is different from finasteride's **enzyme inhibition** [4].

Q: Which steroid has the maximum mineralocorticoid activity?

Fludrocortisone. ***Fludrocortisone*** - **Fludrocortisone** is a synthetic corticosteroid specifically designed to have potent **mineralocorticoid activity**, with significant sodium-retaining properties. - Its high affinity for **mineralocorticoid receptors** distinguishes it from other steroids and makes it effective in treating conditions like **Addison's disease** and **postural orthostatic tachycardia syndrome (POTS)** due to its ability to retain sodium and water. *DOCA (Deoxycorticosterone acetate)* - While **DOCA** does possess significant **mineralocorticoid activity** and was historically used for this purpose, **fludrocortisone** is generally considered to have a stronger and more sustained effect in clinical practice. - **DOCA's** mineralocorticoid potency is substantial but slightly less than that of **fludrocortisone** when compared on a weight basis for equivalent sodium retention. *Prednisolone* - **Prednisolone** is primarily a **glucocorticoid** with potent anti-inflammatory and immunosuppressive effects. - It has minimal to negligible **mineralocorticoid activity** and is not used for salt retention purposes. *Triamcinolone* - **Triamcinolone** is a potent **glucocorticoid** with a long duration of action and is known for its strong anti-inflammatory properties. - It has virtually no **mineralocorticoid activity**, making it unsuitable for conditions requiring sodium retention.

Q: What type of compound is Tibolone?

Synthetic steroidal estrogen. ***Synthetic steroidal estrogen*** - **Tibolone** is a **synthetic steroid** that acts as a selective tissue estrogenic activity regulator (STEAR), mimicking some effects of estrogen, progesterone, and androgens. - Its **steroidal structure** means it is derived from the basic steroid nucleus, setting it apart from non-steroidal compounds. *Natural steroidal estrogen* - **Natural steroidal estrogens** like estradiol are produced endogenously in the body and have a specific chemical structure. - **Tibolone** is a man-made compound developed in a laboratory, not found naturally. *Natural non-steroidal estrogen* - **Natural non-steroidal estrogens** would refer to compounds found in nature (e.g., phytoestrogens) that do not possess a steroid backbone. - **Tibolone** is synthetic and has a **steroidal structure**. *Synthetic non-steroidal estrogen* - **Synthetic non-steroidal estrogens** are man-made compounds (e.g., diethylstilbestrol) that mimic estrogen but lack the steroid nucleus. - **Tibolone**, however, possesses a **steroidal structure**, making this option incorrect.

Q: Which of the following drugs acts directly to induce an erection without the need for sexual stimulation?

Alprostadil. ***Alprostadil***- **Alprostadil** is a **prostaglandin E1** analog that can directly induce vasodilation in the penile arteries, leading to an erection without sexual stimulation [1].- It is typically administered via **intracavernosal injection** or as a **urethral suppository**.*Sildenafil*- **Sildenafil** is a **PDE5 inhibitor** that works by enhancing the effects of **nitric oxide**, which is released in response to sexual stimulation [2, 3].- It requires **sexual arousal** to be effective, as it doesn't directly initiate the erectile process [2, 3].*Tadalafil*- Similar to sildenafil, **tadalafil** is also a **PDE5 inhibitor** that works by increasing cGMP levels and promoting smooth muscle relaxation [2, 3].- Its action is dependent on the release of **nitric oxide** triggered by sexual stimulation [2, 3].*Testosterone*- **Testosterone** is a hormone involved in sex drive and overall erectile function over time, but it does not directly or acutely induce an erection.- Its primary role in erectile dysfunction is in cases of **hypogonadism**, and it requires sexual stimulation for its effects on erection.

Q: Which of the following is a synthetic estrogen?

Diethylstilbestrol. ***Diethylstilbestrol*** - **Diethylstilbestrol (DES)** is a **synthetic non-steroidal estrogen** that was historically used as a medication, particularly to prevent miscarriage. - Its use was discontinued after being linked to various adverse effects, including **vaginal clear cell adenocarcinoma** in female offspring whose mothers took DES during pregnancy. *Estrone* - **Estrone** is one of the three major **naturally occurring endogenous estrogens** in humans. - It is the primary estrogen during **menopause** and is derived from androstenedione. *Estriol* - **Estriol** is another of the three major **naturally occurring estrogens**, predominantly produced during **pregnancy** by the placenta. - It is often used as a marker for fetal well-being. *Estradiol* - **Estradiol** is the **most potent and abundant naturally occurring estrogen** in women during their reproductive years. - It plays a crucial role in the development and maintenance of female reproductive tissues and secondary sexual characteristics.

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

Hypoglycemia. ***Hypoglycemia*** - Chronic steroid use primarily leads to **hyperglycemia** due to increased **gluconeogenesis** and **insulin resistance**, not hypoglycemia. - Steroids raise blood glucose levels, potentially inducing or worsening **diabetes mellitus**. *Avascular necrosis of head of femur* - Long-term steroid use is a well-established risk factor for **avascular necrosis**, particularly affecting the **femoral head**. - This occurs due to impaired blood supply to the bone, leading to its death. *Cataract* - **Posterior subcapsular cataracts** are a known ocular complication of prolonged systemic corticosteroid therapy. - The mechanism involves direct effects of steroids on lens metabolism and protein aggregation. *Growth retardation* - In children, chronic corticosteroid therapy can suppress growth, leading to **growth retardation**. - This is due to interference with **growth hormone secretion** and direct effects on bone formation.

Q: Which tocolytic drug is most characteristically associated with pulmonary edema as an adverse effect?

Ritodrine. ***Ritodrine*** * **Ritodrine** is a **beta-2 adrenergic agonist** that relaxes the uterus, but its non-selective nature can lead to adverse effects like **pulmonary edema** due to fluid retention and myocardial depression. * Other side effects include maternal tachycardia, palpitations, tremors, and hyperglycemia due to its systemic adrenergic activation. *Indomethacin (NSAID)* * **Indomethacin** is a **prostaglandin synthetase inhibitor** that can cause premature closure of the **ductus arteriosus** in the fetus if used for prolonged periods or late in gestation. * Maternal side effects typically include gastrointestinal upset, nausea, and heartburn, with pulmonary edema being extremely rare. *Atosiban (oxytocin receptor antagonist)* * **Atosiban** blocks oxytocin's action, a physiological mechanism for inhibiting uterine contractions, and is considered to have a generally favorable safety profile. * Common side effects are nausea, headache, and dizziness, and it is not associated with pulmonary edema. *Magnesium Sulfate* * **Magnesium sulfate** is a central nervous system depressant and calcium antagonist that can cause **respiratory depression** and **hypotension** in the mother, and rarely maternal pulmonary edema, especially with renal impairment or rapid infusion. * While it can cause pulmonary edema, it is less common than with beta-agonists like ritodrine and usually associated with specific risk factors or overdose.

Q: Which of the following compounds has been studied as a potential male contraceptive?

Gossypol. ***Gossypol*** - **Gossypol** is a natural compound derived from cotton plants that has been extensively studied for its **male contraceptive** properties due to its effect on sperm production. - Research has shown that gossypol inhibits **spermatogenesis** by affecting various enzymes and processes within the testes, leading to reduced sperm count and motility. However, its use has been limited due to concerns about potential side effects, including **hypokalemia** and irreversible infertility in some individuals. *Quinesterol* - **Quinesterol** is a **synthetic estrogen** primarily used as a component of oral contraceptives for women. - Its mechanism of action involves suppressing ovulation and altering the endometrial lining, making it unsuitable as a male contraceptive. *Saheli* - **Saheli**, also known as Centchroman or Ormeloxifene, is a **non-steroidal oral contraceptive** developed in India and is used for women. - It acts as a **selective estrogen receptor modulator (SERM)** in the uterus, preventing implantation, and is not designed or effective for male contraception. *MALA-N* - **MALA-N** (Norethisterone enanthate or NET-EN) is a **long-acting injectable progestogen contraceptive** used for women in India. - It works by suppressing ovulation, thickening cervical mucus, and altering the endometrium, making it unsuitable for male contraception.

Q: Which oral hypoglycemic drug causes an Antabuse-like effect?

Chlorpropamide. ***Chlorpropamide*** - Chlorpropamide, a **first-generation sulfonylurea**, can inhibit aldehyde dehydrogenase, leading to the accumulation of **acetaldehyde** when alcohol is consumed. - This accumulation causes an **Antabuse-like effect**, characterized by flushing, nausea, vomiting, dizziness, and headache. *Acarbose* - Acarbose is an **alpha-glucosidase inhibitor** that delays carbohydrate absorption from the gut. - Its side effects primarily include gastrointestinal disturbances like **flatulence, diarrhea, and abdominal pain**, and it does not cause an Antabuse-like reaction. *Metformin* - Metformin, a **biguanide**, primarily works by reducing hepatic glucose production and improving insulin sensitivity. - Its common side effects are **gastrointestinal upset** (e.g., nausea, diarrhea) and it can rarely cause **lactic acidosis**, but it does not interact with alcohol to produce an Antabuse-like effect. *Gliclazide* - Gliclazide is a **second-generation sulfonylurea** that stimulates insulin release from pancreatic beta cells. - While all sulfonylureas can potentially cause hypoglycemia, gliclazide is less likely to produce a significant Antabuse-like reaction compared to first-generation agents like chlorpropamide.

Q: What is the primary use of Ulipristal acetate?

Emergency contraception. ***Emergency contraception*** - **Ulipristal acetate** is a selective progesterone receptor modulator primarily used as a **highly effective form of emergency contraception**. - It works by delaying or inhibiting **ovulation**, even when luteinizing hormone levels are already rising. - Available up to **120 hours** after unprotected intercourse, making it more effective than levonorgestrel in the later time window. *Treatment of breast cancer* - While some hormonal therapies are used for breast cancer (e.g., tamoxifen, aromatase inhibitors), **Ulipristal acetate** is not indicated for this use. - Its mechanism of action is targeted at progesterone receptors for contraceptive effects, not anti-estrogen or anti-androgen effects relevant to breast cancer. *Management of endometriosis* - Endometriosis management often involves suppressing ovarian function with GnRH agonists or progestins, but **Ulipristal acetate** is not a standard treatment for this condition. - Its primary role is acute prevention of pregnancy, not chronic management of gynecological pain. *Management of abnormal uterine bleeding* - While **Ulipristal acetate** has been approved in some countries for treatment of uterine fibroids and associated heavy menstrual bleeding (marketed as Esmya®), this is **not its primary or most common use**. - Its **primary indication globally** remains emergency contraception, making this option incorrect for a question asking about primary use. - Other hormonal therapies like progestins, COCs, or GnRH agonists are more commonly used first-line for abnormal uterine bleeding.

Question 1

Finasteride is classified as a:

Accepted Answer

5-alpha reductase inhibitor

Answer

Phosphodiesterase inhibitor

Answer

Alpha-1 blocker

Answer

Androgen receptor antagonist

Question 2

Which steroid has the maximum mineralocorticoid activity?

Accepted Answer

Fludrocortisone

Answer

DOCA

Answer

Prednisolone

Answer

Triamcinolone

Question 3

What type of compound is Tibolone?

Accepted Answer

Synthetic steroidal estrogen

Answer

Natural steroidal estrogen

Answer

Natural non-steroidal estrogen

Answer

Synthetic non-steroidal estrogen

Question 4

Which of the following drugs acts directly to induce an erection without the need for sexual stimulation?

Accepted Answer

Alprostadil

Answer

Sildenafil

Answer

Tadalafil

Answer

Testosterone

Question 5

Which of the following is a synthetic estrogen?

Accepted Answer

Diethylstilbestrol

Answer

Estrone

Answer

Estriol

Answer

Estradiol

Question 6

Long-term steroid ingestion leads to all of the following except:

Accepted Answer

Hypoglycemia

Answer

Avascular necrosis of head of femur

Answer

Growth retardation

Answer

Cataract

Question 7

Which tocolytic drug is most characteristically associated with pulmonary edema as an adverse effect?

Accepted Answer

Ritodrine

Answer

Indomethacin

Answer

Atosiban

Answer

Magnesium Sulfate

Question 8

Which of the following compounds has been studied as a potential male contraceptive?

Accepted Answer

Gossypol

Answer

Quinesterol

Answer

Saheli

Answer

MALA - N

Question 9

Which oral hypoglycemic drug causes an Antabuse-like effect?

Accepted Answer

Chlorpropamide

Answer

Gliclazide

Answer

Acarbose

Answer

Metformin

Question 10

What is the primary use of Ulipristal acetate?

Accepted Answer

Emergency contraception

Answer

Treatment of breast cancer

Answer

Management of endometriosis

Answer

Management of abnormal uterine bleeding

Endocrine Pharmacology — MCQs

Endocrine Pharmacology — MCQs

On this page

Practice by Chapter

Want unlimited practice?