Camrese is an extended-cycle birth control pill that reduces your period to just four times a year. Each pack contains 91 pills taken over a 13-week cycle: 84 active hormone pills followed by 7 low-dose estrogen pills. It’s a generic equivalent of Seasonique, containing the same combination of a progestin and an estrogen at identical doses.
How the 91-Day Cycle Works
A Camrese pack has two types of pills. The first 84 are light blue-green tablets, each containing 0.15 mg of a progestin (levonorgestrel) and 0.03 mg of an estrogen (ethinyl estradiol). These are followed by 7 yellow tablets that contain only a very small amount of estrogen (0.01 mg). You take one pill daily for the entire 91-day cycle with no pill-free days.
Your period arrives during the final 7 days when you’re taking the yellow pills. That scheduled bleeding typically lasts about 3 days on average. Once those 7 days are up, you start a new pack immediately, without any break. The result is roughly four periods per year instead of the usual thirteen.
How Camrese Prevents Pregnancy
Camrese works through three overlapping mechanisms. The progestin component suppresses the hormonal surge your body needs to release an egg each month, which is the primary way it prevents pregnancy. The estrogen component suppresses the hormone that stimulates egg follicle development, so even if follicles begin forming, they don’t mature enough to be released. Beyond ovulation suppression, the progestin thickens cervical mucus, making it harder for sperm to reach an egg, and thins the uterine lining so a fertilized egg would have difficulty implanting.
How Effective It Is
In clinical trials of women aged 18 to 35, the failure rate was about 1.34 pregnancies per 100 women-years of use. That number includes women who didn’t always take the pill correctly, so with consistent daily use, effectiveness is higher. This puts Camrese in line with other combination birth control pills, which are among the most effective reversible contraceptive methods when taken as directed.
Breakthrough Bleeding in the First Few Months
Unscheduled spotting or bleeding between periods is the most common complaint with extended-cycle pills, and it’s more frequent than with traditional 28-day packs. In the 12-month clinical trial of over 1,000 women, about 8% stopped taking Camrese specifically because of bleeding or spotting issues. This is most noticeable during the first 91-day cycle.
The pattern improves with time. Unscheduled bleeding and spotting decreased with each successive 91-day cycle in clinical trials. If breakthrough bleeding becomes heavy or lasts more than seven consecutive days, that’s worth discussing with your prescriber. But for most users, the irregular bleeding settles down after the first three to six months.
Common and Serious Side Effects
The most frequently reported side effects in clinical trials were irregular or heavy uterine bleeding, weight gain, and acne. These are consistent with side effects seen across combination birth control pills generally.
Rare but serious complications can occur, including blood clots, stroke, and liver problems. Warning signs that need immediate medical attention include persistent leg pain, sudden shortness of breath, severe chest pain, sudden severe headache unlike your usual headaches, weakness or numbness in an arm or leg, trouble speaking, sudden vision loss, or yellowing of the skin or eyes. These symptoms are uncommon but require urgent evaluation.
What to Do If You Miss a Pill
If you miss one active (blue-green) pill, take it as soon as you remember, even if that means taking two pills the same day. No backup contraception is needed for a single missed pill.
If you miss two or more active pills in a row, take the most recently missed pill as soon as possible and discard any other missed pills. Continue taking the rest of the pack on your normal schedule. You’ll need to use condoms or abstain from sex until you’ve taken active pills for 7 consecutive days. If those missed pills happened during the last week of your active pills, skip the yellow pills entirely, finish the active pills, and start a new pack the next day.
If you missed pills during the first week of a new pack and had unprotected sex in the previous five days, emergency contraception is worth considering.
Medications That Can Reduce Effectiveness
Several common medications speed up how quickly your body breaks down the hormones in Camrese, which can lower its effectiveness or increase breakthrough bleeding. These include certain seizure medications (like carbamazepine, phenytoin, and topiramate), the antibiotic rifampin, the antifungal griseofulvin, and St. John’s wort, a widely available herbal supplement. Some HIV and hepatitis C medications also interact significantly with combination birth control pills.
A cholesterol-lowering medication called colesevelam can also reduce how much estrogen your body absorbs from the pill. If you take any of these medications, your prescriber may recommend a different contraceptive method or an additional backup method.
Camrese vs. Similar Extended-Cycle Pills
Camrese is a generic version of Seasonique. Both contain identical active ingredients at the same doses and follow the same 91-day schedule. CamreseLo and LoSeasonique are lower-dose versions of the same concept, with slightly less estrogen in both the active and final-week pills. Other generics with the same formulation include Amethia, Ashlyna, Daysee, and Setlakin. The choice between brand and generic typically comes down to insurance coverage and cost, since the medications are therapeutically equivalent.