Greetings. Thank you for your question.

You can use Evra patch as soon as the effectiveness of your injected birth control finished which would usually take 3 months after the injection. However this depends on the types of injection you took. You can ask your doctor regarding it.

However, Evra patch would take about a week before it is effective. Thus, you are advice to opt for other kind of contraceptive such as condom for the meantime.

This is just a general answer to your question. For more info I suggest that you refer this to your nearest medical doctor. You may also click on this link (DoctorOnCall) to speak with our doctors online. We assure you that our conversations are kept in confidentiality unless additional consultation needed with other medical parties. Thank you.