Okay, let's tackle this question about the desogestrel minipill. The question is asking about the administration schedule for a contraceptive minipill containing 75 mcg of desogestrel. The options aren't provided, but since it's a common question, I can recall that progestin-only pills (POPs) like the minipill require strict daily adherence.

First, the core concept here is understanding the correct dosing and administration of progestin-only contraceptives. Desogestrel is a third-generation progestin, and the minipill is different from the combined oral contraceptive pill because it doesn't contain estrogen. The main point is the strict 24-hour schedule for administration.

Why is the correct answer right? The desogestrel minipill must be taken once daily without missing a dose, and if a dose is missed by more than 3 hours, contraceptive effectiveness can be compromised. This is because the pill relies on maintaining a certain hormone level without the estrogen component to compensate for missed doses. The schedule is typically one pill every day at the same time, with no break between packs.

For the incorrect options, if any of them suggested a 12-hour schedule or a 3-hour window for missed doses, those would be wrong. For example, older progestin-only pills like norethindrone might have a 12-hour schedule, but desogestrel has a longer half-life, allowing for a 24-hour schedule but with a stricter 3-hour window for taking the next pill. So if an option said 12 hours, that's incorrect. Another wrong option might suggest a 24-hour window for missed doses, which isn't the case here.

The clinical pearl here is remembering that the "minipill" requires daily dosing and that missing a dose by more than 3 hours reduces effectiveness. Students often confuse the timing with the combined pill, which has a 12-hour window. Mnemonically, "deso" (desogestrel) has a "3-hour rule" for missed doses, so the schedule is strict daily intake.

Putting it all together, the correct answer would be the option stating "One pill daily at the same time, without break." The key is the daily administration and the strict timing to maintain efficacy. The other options that suggest different schedules are incorrect based on the pharmacokinetics of desogestrel versus other progestins.

**Core Concept**
Progestin-only contraceptives like desogestrel require strict adherence to a daily dosing schedule to maintain efficacy. Desogestrel, a third-generation progestin, has a longer half-life than older progestins, allowing for once-daily administration but with a narrow margin for missed doses.

**Why the Correct Answer is Right**
The desogestrel minipill is administered as **one tablet daily at the same time**, with no break between packs. This schedule ensures continuous suppression of ovulation and endometrial thickening. Missing a dose by more than 3 hours reduces contraceptive effectiveness due to lower serum progestin levels, risking breakthrough ovulation. Unlike combined oral contraceptives, estrogen is absent, so missed doses cannot be compensated by estrogen’s anti-gonadotropic effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Suggests a

✓ Correct Answer: D. Taken for 28 days with no pill free interval