Twirla patches are used in a 28-day (four-week) cycle. A new patch is applied and worn for seven days for three consecutive weeks (Weeks 1, 2, and 3). No Twirla patch is worn during Week 4 (the patch-free week), when withdrawal bleeding is expected.
On the day after Week 4 ends, a new 28-day cycle is started by applying a new Twirla patch. Under no circumstances should there be more than a 7-day patch-free interval between each 28 day dosing cycle.
 Detailed Twirla dosage information
What happens if I miss a dose?
During your patch-free week, do not go without wearing a patch for longer than 7 days. Missing a dose increases your risk of becoming pregnant and you may need to use back-up birth control. Call your doctor if you miss a period for 2 months in a row.
If you forget to apply a Twirla patch at the start of a new cycle:
Apply a patch as soon as you remember and start a new cycle on that day (3 weeks wearing a weekly patch, 1 week off). Use back-up birth control such as a condom/diaphragm with spermicide during the first week of your new cycle.
If you forget to change your patch during the 3-week wearing time:
If it has been 24-48 hours since your scheduled patch change, apply a new patch and change it on your regular change day.
If it has been more than 48 hours since your scheduled patch change, apply a new patch and start a new cycle on that day (3 weeks wearing a weekly patch, 1 week off). Use back-up birth control during the first week.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
