Cystelia works as a regular birth control only if it has been taken correctly and consistently, so it may not fully protect you if there are missed or irregular doses. In such cases, an I-pill may be needed as emergency protection after unprotected sex. Taking both together can increase hormone levels and may cause side effects like nausea or irregular bleeding, but it is sometimes used when required. Confirm with a doctor based on how regularly you have been taking Cystelia so you can take the safest step.

Cystelia is a hormonal tablet that already works to prevent ovulation and acts as a birth control method, so in many cases, extra emergency medicine may not be needed. Taking an I pill along with it can add a high dose of hormones and may lead to side effects like irregular bleeding or nausea. It is better not to combine both on your own. A doctor can guide you on whether an emergency pill is actually required in your situation and advise the safest option.