Which one of the following is a nonsteroidal compound with potent antiestrogenic properties used for oral con… - ESIC Nursing Officer-7July 2024

ESIC Nursing Officer-7July 2024

Pharmacology

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Appeared in: ESIC Nursing Officer-7July 2024

Explanation

Centchroman is a non-steroidal compound, which fundamentally distinguishes it from the other options which are all steroidal hormones.
It functions as a Selective Estrogen Receptor Modulator (SERM), exerting potent anti-estrogenic effects on the endometrium, which prevents the implantation of a blastocyst.
Unlike daily pills, Centchroman is administered as a weekly oral contraceptive, marketed in India's National Family Planning Program as 'Chhaya'.
Its mechanism makes it a suitable contraceptive for women with contraindications to estrogen-containing pills.

Option A: This option is incorrect because progestin-only pills contain synthetic steroid hormones called progestins. The question specifically asks for a non-steroidal compound.
Option B: Levonorgestrel is a widely used synthetic steroidal progestin. It is a key component in many combined oral contraceptives, progestin-only pills, and emergency contraception, but it is not a non-steroidal compound.
Option C: Desogestrel is a third-generation synthetic steroidal progestin used in modern low-dose oral contraceptives. It is a steroid hormone, not a non-steroidal compound.

Visual 1: Table: Comparison of Contraceptive Pills - A table comparing Centchroman, Progestin-only pills, and Combined pills based on hormone type (steroidal/non-steroidal), mechanism, and dosing frequency.
Visual 2: Flowchart: Mechanism of Action of Centchroman - A visual showing how Centchroman's anti-estrogenic effect on the endometrium prevents blastocyst implantation, contrasting with the ovulation-inhibiting effect of steroidal pills.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology of non-steroidal oral contraceptives as background academic context rather than a clinical decision trigger.
Centchroman (also known as Ormeloxifene) is a valuable contraceptive option for women who have contraindications to estrogen-containing contraceptives, such as a history of thromboembolism, or for those who are breastfeeding.
As a non-hormonal option, it has a different side-effect profile. Delayed or irregular menses is a common side effect, but it avoids the metabolic and cardiovascular risks associated with steroidal hormones.
It is an important component of India's National Family Planning Program, provided under the brand name 'Chhaya', highlighting its significance in public health initiatives.

How to Approach the Question

First, dissect the question to identify the three key criteria for the correct answer: 1) non-steroidal chemical structure, 2) anti-estrogenic properties, and 3) use as an oral contraceptive.
Next, evaluate each option. Recall that 'progestin' is a term for synthetic progesterone, which is a steroid hormone. This immediately flags 'Progestin-only pill', 'Levonorgestrel', and 'Desogestrel' as steroidal.
This process of elimination leaves 'Centchroman' as the only non-steroidal option.
Finally, confirm that Centchroman has anti-estrogenic properties and is used for contraception. It is known as a SERM with anti-estrogenic effects on the uterus, confirming it as the correct choice.

Concept Tested & Keywords

Concept Tested: Pharmacology of non-steroidal oral contraceptives
Stem keywords: nonsteroidal compound, antiestrogenic properties, oral contraception
Lead-in keywords: Which one
Negative lead-in flag: false

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