Quick answer: Opill is a daily progestin-only birth control pill containing 0.075 milligrams of norgestrel. It does not contain estrogen and is available in the United States without a prescription.
Take one tablet at the same time every day, including on days when you are bleeding or spotting. Every tablet is active, and you should begin the next pack immediately after finishing the current one.
The FDA label instructs users to use condoms or another barrier method for the first 48 hours after starting Opill.
If you take a tablet more than three hours late, take one as soon as you remember, continue at your usual daily time, and use a barrier method for the next 48 hours.
What Does Over-the-Counter Mean?
Over-the-counter means that Opill can be purchased without obtaining a prescription first. It may be available at pharmacies, grocery stores, convenience stores, and online retailers.
This does not mean the instructions are optional or that the pill is appropriate for every person. Read the complete Drug Facts label and consumer leaflet every time you purchase it.
Routine healthcare remains important even when birth control is available without a prescription.
What Kind of Birth Control Pill Is Opill?
Opill is a progestin-only pill. It contains norgestrel and does not contain estrogen.
Progestin-only pills mainly work by thickening cervical mucus, making it more difficult for sperm to reach an egg. They may also affect ovulation, but norgestrel pills do not consistently stop ovulation in every cycle.
Because norgestrel levels fall relatively quickly, taking Opill at approximately the same time each day matters, similar to the 3-hour timing window described for traditional mini-pills.
Opill is not:
- Emergency contraception
- An abortion medication
- Protection against sexually transmitted infections
- A combined birth control pill
- A pill with placebo tablets
How Effective Is Opill?
The FDA reports that effectiveness can be as high as 98 percent with perfect use. Perfect use means taking every tablet at the same time each day without breaks between packs.
Real-world effectiveness is lower because people sometimes take pills late or miss them. The CDC estimates that approximately seven out of 100 progestin-only pill users become pregnant during the first year with typical use.
A consistent routine matters more than choosing a theoretically perfect clock time that is difficult to maintain.
How to Start Opill
You can start Opill on any day of the month.
Follow these steps:
- Take the first tablet at a time you can realistically maintain every day.
- Use a condom or another barrier method every time you have sex during the first 48 hours.
- Continue taking one tablet daily, even if you bleed or spot.
- Start the next pack the day after finishing the current pack.
- Do not take a break between packs.
If you are switching from another birth control method, read the enclosed switching instructions or ask a pharmacist or healthcare provider. The correct transition can depend on the method you currently use.
Are There Placebo Pills in Opill?
No. All 28 Opill tablets are active.
There is no placebo week and no planned pill-free interval. When you finish one pack, take the first tablet from the next pack the following day.
A break between packs can reduce protection.
What if You Take Opill Late?
Less than three hours late
Take the tablet as soon as you remember and continue taking one tablet daily at your usual time.
Under the Opill instructions, a tablet taken less than three hours late is not treated as a missed tablet.
More than three hours late
If you are more than three hours late:
- Take one tablet immediately when you remember.
- Take your next tablet at your usual time.
- Continue taking one tablet daily.
- Use condoms or another barrier method every time you have sex for the next 48 hours.
You may take two tablets in one calendar day if you take the late tablet and your regularly scheduled tablet on the same day.
Do not take several tablets at once to replace every tablet missed over multiple days.
Less than 3 hours late
Not treated as a missed tablet
Take it now and continue at your usual time. No backup contraception needed under the Opill label.
More than 3 hours late
Take it now and use backup contraception
Take the missed tablet immediately, continue your normal schedule, and use condoms or another barrier method for the next 48 hours.
What if You Miss Opill for One or More Days?
Take one tablet as soon as you remember. Return to your regular daily schedule and use a barrier method for the next 48 hours.
If you had sex without a barrier after a missed pill, contact a pharmacist, doctor, OB-GYN, or emergency contraception service promptly. Emergency contraception options have different instructions, and ulipristal acetate can affect when hormonal birth control should be restarted. For scenario-by-scenario guidance on missed doses generally, see our missed-pill guide hub.
Opill itself is not emergency contraception.
What if You Vomit or Have Severe Diarrhea?
According to the current Opill label, if you vomit or experience severe diarrhea within four hours after taking a tablet, the medication may not have been fully absorbed.
Continue your next tablet at the usual time and use a condom or another barrier method every time you have sex for the next 48 hours.
If vomiting or diarrhea continues, contact a healthcare provider or pharmacist for guidance. Ongoing illness can complicate pill absorption. Other pills use different vomiting and diarrhea windows, so see our full guide to vomiting or diarrhea on the pill if you are unsure which rule applies to your specific product.
What Bleeding Changes Can Opill Cause?
Irregular bleeding is common with progestin-only pills.
You may experience:
- Spotting between periods
- More frequent bleeding
- Less frequent bleeding
- Lighter bleeding
- Heavier bleeding
- No bleeding
A change in bleeding does not automatically mean Opill is not working.
Talk to a healthcare provider if you develop bleeding after sex, bleeding lasting more than eight days, unusually heavy bleeding, or a pattern that concerns you.
Take a pregnancy test or contact a doctor if your period is late after missed pills, you have not had a period for two months, or you think you may be pregnant.
Who Should Not Use Opill?
Do not use Opill if:
- You currently have or previously had breast cancer
- You know or suspect that you are pregnant
- You are using another birth control pill, patch, ring, implant, injection, or IUD
- You are allergic to norgestrel or another ingredient in the product
Ask a doctor before using Opill if you have unexplained vaginal bleeding, liver disease, or a current or previous cancer diagnosis.
These are label warnings, not a complete substitute for personal medical guidance.
Which Medications Can Interact With Opill?
Ask a doctor or pharmacist before using Opill if you take medication for:
- Seizures
- Tuberculosis
- HIV or AIDS
- Pulmonary hypertension
You should also ask about St. John's wort or other supplements. Some medications and supplements can reduce hormonal birth control effectiveness.
Tell the pharmacist if you used ulipristal acetate emergency contraception within the past five days. Hormonal birth control can interfere with how ulipristal works.
Does Opill Protect Against Sexually Transmitted Infections?
No. Opill does not protect against HIV or other sexually transmitted infections.
Condoms can reduce STI transmission risk when used correctly and consistently.
When Should You Seek Urgent Medical Help?
Seek urgent care if you experience sudden, severe, persistent lower abdominal pain, particularly if it is mostly on one side. This can require assessment for an ectopic pregnancy.
You should also seek medical help for yellowing of the skin or eyes, especially with fever, unusual tiredness, loss of appetite, or dark urine.
Stop using Opill and contact a doctor if you become pregnant.
Making the Three-Hour Schedule Easier
Choose a time connected to something you already do every day, such as brushing your teeth or preparing for bed.
Helpful strategies include:
- Setting more than one reminder
- Keeping a spare pack available
- Checking your supply before travel
- Recording late or missed tablets
- Reordering before the current pack runs out
Estroclic can help you schedule daily birth control pill reminders and record when a pill was actually taken. This can be especially useful for a progestin-only pill with a three-hour late window, similar to how mini-pill users track their timing window.
The app cannot determine whether you are protected after a mistake or replace the FDA label, pharmacist, or healthcare provider.
Available on Google Play and the App Store
A simple record of when you actually took Opill
Estroclic sends daily reminders and records the exact time you take each tablet, so you have an accurate history instead of trying to remember. Estroclic is a tracking app, not a source of protection decisions, medication advice, or emergency guidance.
Key takeaways
- Opill is a progestin-only pill (norgestrel) sold without a prescription in the US. All 28 tablets are active, with no placebo week.
- A tablet more than 3 hours late counts as missed: take it, continue your schedule, and use a barrier method for 48 hours.
- Vomiting or severe diarrhea within 4 hours of a dose may reduce absorption; use backup contraception for 48 hours per the FDA label.
- Opill is not emergency contraception and does not protect against STIs.
Frequently asked questions
Can I start Opill at any time?
Yes. The FDA label says you can start on any day of the month. Use condoms or another barrier method for the first 48 hours after starting.
What time should I take Opill?
Choose a time you can maintain every day. Consistency matters more than whether you take it in the morning or evening.
What happens if I take Opill four hours late?
A tablet taken more than three hours late is considered missed. Take one tablet as soon as possible, continue your normal schedule, and use a barrier method for 48 hours.
Does Opill have placebo pills?
No. All 28 tablets are active. Start the next pack immediately without a break.
Can Opill be used as emergency contraception?
No. Opill is a daily birth control pill and should not be used as emergency contraception.
Do I need a prescription for Opill?
No. Opill is approved for nonprescription sale in the United States.
Sources
- FDA. Opill (0.075mg oral norgestrel tablet) information. fda.gov
- FDA. Current Opill Drug Facts label. accessdata.fda.gov
- FDA. FDA Approves First Nonprescription Daily Oral Contraceptive. fda.gov
- CDC. Progestin-Only Pills, U.S. Selected Practice Recommendations for Contraceptive Use, 2024. cdc.gov
- ACOG. First Over-the-Counter Daily Contraceptive Pill Released. acog.org
- Source review date: 8 August 2026