National Study, Phase III, Parallel, Double Blind, Placebo Comparative and Randomized to Evaluate the Therapeutic Efficacy and Tolerability of the Combination Naturetti® (Cassia Fistula + Senna Alexandrina Miller) in the Chronic Functional Constipation.

Primary Objective:

To evaluate the clinical efficacy of Naturetti (capsules) , considering the following criteria:

• Evacuation frequency during the treatment and follow-up period
• Consistency of stools during the treatment and follow-up period
• Global evaluation, regarding increase in frequency of evacuation and shape of stools.

Secondary Objective:

• Number of days without evacuation
• Proportion of evacuation with pain
• Proportion of evacuation with strain
• Proportion of evacuation with incomplete sensation
• Proportion of blocked stools
• Proportion of manual maneuvers to facilitate defecation
• Proportion of subjects that adhere to the diet recommended
• Proportion of the patients who have to use rescue medication
• Level of constipation improvement, according to the patient evaluation
• To evaluate clinical tolerability of the study medication by the continuous use
• To evaluate the occurrence of adverse events related to the study drug
• To identify any drug interaction.