Adherence to the dosing scheme is the principal element of Combined Oral Contraceptives efficiency. On the other hand noncompliance seemed to be an inseparable element of any oral treatment. The aim of the study is to evaluate in everyday practice the relation between dosage errors and indicated factors, potentially influencing the compliance with the dosing scheme.

Inclusion Criteria:

• Patients at the age of over 18 requiring contraception. The decisions would be made at the discretion of the attending physician.

Exclusion Criteria:

• According to official Summary of Product Characteristics (SmPC) contraindications.

Gynecological practices patients - starters or current users.