What is the Dose of Levonorgesterol in emergency contraception?

NORCET 3 - 2022 (Shift-2)

Pharmacology

Easy

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

The standard and most common regimen for levonorgestrel-based emergency contraception is a single oral dose of 1.5 mg.
This single-dose approach (e.g., Plan B One-Step) is preferred for its simplicity and improved compliance compared to older multi-dose regimens.
It should be taken as soon as possible, ideally within 72 hours of unprotected intercourse, to maximize effectiveness by delaying or inhibiting ovulation.

Option B: A dose of 3.0 mg is excessive and not a standard or recommended regimen for emergency contraception. It would likely increase the incidence and severity of side effects like nausea without providing additional benefit.
Option C: A 1.0 mg dose is considered subtherapeutic for emergency contraception and would have lower efficacy in preventing pregnancy compared to the standard 1.5 mg dose.
Option D: While 0.75 mg is a valid dose, it is specific to the older two-dose regimen, where one tablet is taken, followed by a second 0.75 mg tablet 12 hours later. It is not the standard single-dose treatment.

Visual 1: Comparison Chart - A chart comparing the different types of emergency contraception (Levonorgestrel, Ulipristal Acetate, Copper IUD), their dosages, timeframes for use, and effectiveness rates. This helps learners quickly compare and contrast the options.
Visual 2: Timeline Graphic - A timeline showing the decreasing efficacy of levonorgestrel emergency contraception over time (e.g., within 24h, 48h, 72h, up to 120h) to emphasize the importance of taking it as soon as possible.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Pharmacological knowledge of emergency contraception in acute care settings.
A nurse's primary role is patient education. When a patient requests emergency contraception, the nurse must provide clear, non-judgmental information about correct dosage, timing, potential side effects, and effectiveness.
It is critical to counsel the patient that emergency contraception is not a regular form of birth control and does not protect against STIs. This is an opportunity to discuss reliable, long-term contraceptive methods.
What if? If a patient reports vomiting 1 hour after taking the 1.5 mg dose, the nurse should advise them to obtain and take a repeat dose, as the initial dose was likely not absorbed.

How to Approach the Question

First, identify the core of the question. This is a direct factual recall question asking for a specific drug dosage.
Scan the options provided: 1.5 mg, 3.0 mg, 1.0 mg, and 0.75 mg. Recognize that these are all potential dosages, making precise knowledge necessary.
Recall the standard pharmacological guidelines for emergency contraception. The most current single-dose regimen for levonorgestrel is 1.5 mg.
Consider the other options as distractors. 0.75 mg is a plausible distractor because it's used in the older two-dose regimen. 3.0 mg and 1.0 mg are incorrect dosages (too high and too low, respectively).
Select the option that represents the most common, current, single-dose standard, which is 1.5 mg.

Concept Tested & Keywords

Concept Tested: Pharmacological knowledge of emergency contraception.
Stem keywords: Dose, Levonorgestrel, emergency contraception
Lead-in keywords: What is
Clinical cues: The care setting changes urgency, monitoring level, and the expected nursing action.

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