Drospirenone and ethinyl estradiol tablets are taken once daily, at the same time each day, following a specific schedule of active and inactive pills in your pack. Most packs contain 24 active (yellow) tablets followed by 4 inactive (white) tablets, though some brands use a 21-active/7-inactive format. Getting the timing and sequence right matters for effectiveness, so here’s exactly how to do it.
Choosing Your Start Day
You have two options for when to begin your first pack. A “Day 1 start” means you take your first active pill on the first day of your period. A “Sunday start” means you take your first pill on the first Sunday after your period begins. If your period happens to start on a Sunday, that day counts as both.
Regardless of which start method you choose, your body needs at least 7 days to adjust before the pill reliably prevents pregnancy. Use a backup method like condoms during that first week.
The Daily Routine
Take one pill every day, ideally at the same time. Work through the active pills in order, then take the inactive pills. Your period will typically arrive during the inactive pill days. Once you finish the pack, start a new one the next day with no gap between packs.
Consistency in timing is what makes oral contraceptives work well. A large U.S. cohort study found that the 24-day active pill regimen (which drospirenone formulations commonly use) had a first-year failure rate of about 2.1% under real-world conditions, compared to 3.5% for conventional 21-day regimens. That advantage comes partly from the shorter hormone-free window, but it only holds if you’re taking pills on schedule.
What to Do If You Miss a Pill
The protocol depends on how many pills you missed and when in your cycle it happened.
One active pill missed: Take it as soon as you remember, even if that means taking two pills in one day. No backup contraception is needed.
Two active pills missed in Week 1 or Week 2: Take two pills as soon as possible and two pills the next day. Then return to one pill daily until the pack is finished. Use condoms for the next 7 days.
Two active pills missed in Week 3 or Week 4: If you’re a Day 1 starter, throw out the rest of the pack and start a new one that same day. If you’re a Sunday starter, keep taking one pill daily until Sunday, then discard the pack and start fresh. Use backup contraception for 7 days. You may not get a period that month, which is expected. If you miss two periods in a row, take a pregnancy test.
Three or more active pills missed in any week: Follow the same instructions as missing two pills in Week 3 or 4. Discard the pack and start a new one (immediately for Day 1 starters, on Sunday for Sunday starters). Use backup for 7 days.
Inactive pills missed: Missing one or more inactive (white) pills doesn’t affect your protection. Just discard the missed ones and start your next pack on the correct day.
Vomiting or Diarrhea After Taking a Pill
If you vomit within a few hours of taking your pill, your body may not have absorbed the hormones. Treat it the same way you’d treat a missed pill. If vomiting continues, use backup contraception until you’ve been able to keep pills down for 7 consecutive days.
Diarrhea lasting more than 24 hours can also interfere with absorption. Keep taking your pill on schedule, but use condoms until 7 days after the diarrhea stops. If either situation happens while you’re on the last 7 active pills before your inactive pills, skip the inactive pills entirely and start a new pack right away.
Medications That Can Interfere
Drospirenone has a unique property among birth control progestins: it works similarly to a type of blood pressure medication that causes your body to retain potassium. A 3 mg tablet of drospirenone has roughly the same potassium-sparing effect as 20 to 25 mg of spironolactone. For most people this is harmless and even beneficial (it can reduce bloating). But if you’re also taking other medications that raise potassium levels, the combination can push potassium too high.
Medications in this category include ACE inhibitors and ARBs (commonly prescribed for blood pressure), NSAIDs like ibuprofen and naproxen, potassium-sparing diuretics, and certain other drugs like cyclosporine and heparin. One study found that nearly 18% of people prescribed this pill were also taking a potassium-affecting medication. If you regularly use any of these, your provider may want to check your potassium levels during your first cycle.
Spotting and Breakthrough Bleeding
Irregular bleeding or spotting is common during the first few months on any combined oral contraceptive. It doesn’t mean the pill isn’t working. Your body is adjusting to the hormonal pattern, and this typically resolves within two to three cycles.
If unexpected bleeding or spotting persists for 7 or more consecutive days, some prescribers may recommend a short 4-day break from active pills (provided you’ve been on the medication continuously for at least 28 days). This brief pause allows for a withdrawal bleed that can “reset” the bleeding pattern. Talk to your provider before doing this on your own, since the break needs to be timed carefully to maintain contraceptive protection.
Blood Clot Risk
All combined oral contraceptives carry a small risk of blood clots, and drospirenone-containing pills carry a somewhat higher risk than older formulations. A population-based cohort study found that drospirenone users had about a 43% higher rate of venous blood clots compared to users of third-generation pills, and about 65% higher compared to second-generation pills. In absolute terms, the risk remains low for most people: blood clots from oral contraceptives affect roughly 3 to 4 out of every 10,000 users per year.
The risk is highest during your first year on the pill, particularly in the first few months. It’s also elevated if you smoke, are over 35, have a family history of clots, or are significantly overweight. Notably, this increased clot risk applies only to venous events (deep vein thrombosis, pulmonary embolism). The study found no increased risk of arterial events like stroke compared to other oral contraceptives.
Effect of Body Weight on Effectiveness
Research shows a slight increase in contraceptive failure rates at higher body mass index levels. The relationship is modest but measurable. If you have concerns about your weight affecting the pill’s reliability, it’s worth discussing with your provider, though the 24-day drospirenone regimen still outperformed 21-day regimens across weight categories in the studies that examined this.