The birth control patch is a small adhesive square, about 1.75 inches across, that you stick to your skin once a week to prevent pregnancy. It releases two hormones (estrogen and progestin) directly through the skin and into your bloodstream, working the same way combination birth control pills do but without the daily routine. Two brands are currently available in the U.S.: Xulane and Twirla.
How the Patch Prevents Pregnancy
The patch delivers a steady stream of estrogen (ethinyl estradiol) and a form of progestin (either norelgestromin or levonorgestrel, depending on the brand) through the skin. These hormones do three things: they stop your ovaries from releasing an egg each month, they thicken the mucus at the opening of the cervix so sperm have a harder time getting through, and they thin the lining of the uterus so a fertilized egg would be less likely to implant.
One important distinction from the pill: because the hormones absorb continuously through the skin rather than passing through the digestive system, the average amount of estrogen circulating in your blood tends to be higher with the patch than with an oral contraceptive. This matters for side effects, which we’ll get to below.
How to Use It
You apply one patch per week for three consecutive weeks, then go one week without a patch. During that patch-free week, you’ll typically get a withdrawal bleed similar to a period. After the week off, you start the cycle again with a fresh patch on the same day of the week you started the previous cycle.
The patch can go on your upper arm, abdomen, buttock, or upper back. Avoid placing it on your breasts. Rotate the location each week to reduce skin irritation, and press the patch firmly for about 10 seconds to make sure it sticks well. It’s designed to stay on through showers, exercise, and swimming.
If you want to skip your period, you can use the patch as continuous-dose birth control by applying a new patch every week on the same day without ever taking the patch-free week.
How Effective It Is
With perfect use, meaning you change the patch on time every single week, it’s about 99% effective. In real life, where people sometimes forget or are late replacing it, effectiveness drops to around 91%. That means roughly 9 out of 100 patch users get pregnant in a typical year.
Body weight can affect how well the patch works. A pooled analysis of clinical data found a higher proportion of pregnancies among patch users who weighed 198 pounds (90 kg) or more, and a separate analysis linked a BMI over 30 with increased failure rates. If you’re in that range, it’s worth discussing alternative methods or backup options with your provider.
Common Side Effects
Most side effects are similar to what you’d experience on the pill, and many ease up after the first month or two. The most frequently reported include:
- Headaches, especially in the first few weeks, which tend to improve over time
- Nausea
- Breast tenderness
- Irregular bleeding or spotting between periods
- Mood changes
- Skin irritation at the application site, including redness or itching
Blood Clot Risk
All combined hormonal contraceptives carry a small risk of blood clots in the legs (deep vein thrombosis) or lungs (pulmonary embolism). With the patch, that risk may be slightly higher than with the pill because of the greater estrogen exposure through the skin. The absolute risk is still low for most people, but it’s more significant if you smoke, are over 35, have a history of clotting disorders, or have other cardiovascular risk factors. These are the same groups who are generally advised to avoid any estrogen-containing contraceptive.
Advantages Over the Pill
The biggest practical benefit is the weekly schedule. Remembering to do something once a week is far easier for most people than taking a pill at the same time every day. A missed or late pill can compromise protection quickly, while the patch provides continuous hormone delivery between changes. You also don’t need to worry about vomiting or diarrhea interfering with absorption the way it can with oral contraceptives.
The downsides are mostly cosmetic and skin-related. The patch is visible if it’s in a spot not covered by clothing, and it can leave a sticky residue or cause localized irritation. Some people find it peels at the edges in humid weather or during heavy sweating, though full detachment is uncommon.
What It Costs
Under the Affordable Care Act, all private health insurance plans are required to cover FDA-approved contraceptives, including the patch, with no copay, coinsurance, or deductible. If you’re uninsured, out-of-pocket costs vary but generally fall in a similar range to oral contraceptives, which average $25 to $50 per month. Some clinics and family planning programs offer patches at reduced cost or free.
If Your Patch Falls Off or You’re Late
If your patch partially or fully detaches for less than 24 hours, press it back on or replace it with a new one. You’re still protected and don’t need backup contraception. If it’s been off for more than 24 hours, or if you’re not sure how long, apply a new patch to start a fresh cycle and use a backup method like condoms for the first week. The same general rule applies if you forget to change your patch on the scheduled day: under 48 hours late is usually fine, but beyond that, treat it as a new cycle start and use backup protection for seven days.