Efficacy Study of Methenamine + Methylthioninium Chloride vs Phenazopyridine for the Symptomatic Control of Dysuria

Inclusion Criteria: * Patients who agree to participate by agreeing to the terms proposed in the Clinical trial; * Patients aged over 18 years of any ethnicity; * Presence of dysuria with marking greater than or equal to 5 measured points on the categorical scale pre-treatment for pain symptom; Exclusion Criteria: * Patients who are febrile (axillary T º: ≥ 38 ° C), with back pain or lumbar; * Patients with complicated clinical presentation of urinary tract infection; * Patients with a history of allergy or intolerance to any known or suspected one of the ingredients of the product under investigation; * Patients who are pregnant or during lactation, or childbearing potential and are not making use of effective contraception; * Patients presenting with renal disease or severe liver disease, according to medical history and / or laboratory; * Patients presenting with severe systemic disease according to the known medical history; * Patients who received antibiotic treatment, anthelmintic within 7 days prior to study entry; * Patients unable to understand the guidelines specified in this protocol or can not attend all study visits or unable to complete the log; * Pregnancy or risk of pregnancy and lactating patients; * Any finding of clinical observation (history and physical examination) that is interpreted by the physician investigator as a risk to the patient's participation in the study.