DMPA contraceptive protection up to?

NORCET 2 -2021 (Shift-2)

Pharmacology

Easy

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

Depot Medroxyprogesterone Acetate (DMPA), commonly known as Depo-Provera, is a progestin-only injectable contraceptive.
A single dose of DMPA (150 mg IM or 104 mg SC) provides effective contraceptive protection for 3 months (12-13 weeks).
Its primary mechanism is the suppression of ovulation, preventing the release of an egg.
It also thickens cervical mucus, creating a barrier that hinders sperm penetration.

Option A: A 1-month protection period is characteristic of combined injectable contraceptives, which contain both estrogen and progestin (e.g., Cyclofem, Mesigyna), not the progestin-only DMPA.
Option B: A 2-month (8-week) protection period is associated with a different progestin-only injectable, Norethisterone Enantate (NET-EN), not DMPA.
Option D: A 6-month duration is not a standard interval for any commonly used injectable contraceptive. Contraceptive implants (like Norplant or Jadelle) provide longer-term protection (e.g., 3-5 years), but not in 6-month injectable intervals.

Visual 1: Infographic: A comparative chart of different hormonal contraceptive methods (pills, patches, rings, injectables, implants) showing their type, duration of action, and typical use effectiveness.
Visual 2: Diagram: A timeline illustrating the injection schedule for DMPA over a year, highlighting the 3-month intervals for re-administration.
Visual 3: Illustration: A simple diagram showing the two primary mechanisms of DMPA: suppression of ovulation in the ovary and thickening of mucus in the cervix.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology of Hormonal Contraceptives as background academic context rather than a clinical decision trigger.
Patient counseling is critical. Nurses must emphasize the importance of returning for the next injection every 12-13 weeks to maintain contraceptive efficacy. A grace period of a few weeks is often allowed, but adherence is key.
Nurses should educate patients about common side effects, particularly menstrual irregularities (spotting, breakthrough bleeding, or amenorrhea), potential weight gain, and headaches. Amenorrhea becomes more common with long-term use.
A key counseling point is the delayed return to fertility. After stopping DMPA, it can take an average of 5-10 months for fertility to return, which is longer than with many other contraceptive methods.

How to Approach the Question

First, identify the key term in the question: 'DMPA'. This is a specific medical abbreviation for a contraceptive.
Next, recall the properties of DMPA. The question asks for its 'protection up to', which means its duration of effectiveness.
Differentiate DMPA from other hormonal contraceptives. Your knowledge should include different types like daily pills, monthly rings, and other injectables with different schedules.
Systematically evaluate the options. '3 months' is the standard, well-known duration for DMPA (Depo-Provera).
Eliminate other options by recalling that 1-month is for combined injectables, 2-months is for NET-EN, and 6-months is not a standard injectable interval.

Concept Tested & Keywords

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