Efficacy and Safety of DEC103 in Pain Control Associated to Intrauterine Device (IUD) Insertion

Inclusion Criteria: * Patient has given written informed consent to participate in the study prior to admission; * Female patients aged between 18 and 49 years old; * First IUD users; * Nulliparous women. Exclusion Criteria: * Any finding or clinical observation (clinical/physical evaluation) or laboratory condition that is interpreted by the investigating physician as a risk to the participation of the research participant in the clinical trial or presence of uncontrolled chronic disease(s); * Presence of chronic pelvic pain and any uterine malformation; * Presence of psychiatric disorder; * Chronic use of medications that interfere with the pain threshold, for example: antidepressants and anticonvulsants; * Use of analgesics and/or ant-inflammatory in the last 24 hours prior the procedure; * Any sign or symptom of vaginal or cervical infection; * Participants with any contraindication to one or both medicines that constitute the DEC103 treatment; * Actual abuse of alcohol or drugs; * Participants who are nursing; * Presence of known allergy or hypersensitivity to the components of the drugs used during the clinical trial; * Participants with a current medical history of cancer and/or cancer treatment in the last five (05) years; * Participation in a clinical research protocol in the last 12 months (CNS Resolution 251, of August 7, 1997, item III, subitem J), unless the investigator judges that there may be a direct benefit to it.