This phase IIa study is designed as a multi-centre, single country, randomised, double-blind, placebo controlled study in three parallel groups, with the aim to evaluate the efficacy and safety of Nepadutant given at two oral doses once daily for seven days in comparison to placebo in the treatment of infantile colic.

Infant colic is a functional gastrointestinal disorders which affects up to the 30% of the infant population; it is primarily characterised by excessive inconsolable crying starting without any apparent cause and lasting for several hours per day.

Current non pharmacological interventions (e.g. message, restriction in maternal diet in breast-feeding infants) and pharmacological treatments (simethicone, antimuscarinic drugs) are largely unsatisfactory.

In animal models, Nepadutant reverse the exaggerated intestinal motility and sensitivity, induced by different stimuli, without producing inhibitory effects on these functions at baseline, suggesting that Nepadutant could have a therapeutic effect with no interference on physiological gastrointestinal transit.

This phase IIa study is designed to evaluate the efficacy of Nepadutant paediatric oral solution given once daily at two doses in comparison to placebo.

The experimental clinical phase encompasses the following periods:

• Screening period (no study medication) to be done 7 to 4 days prior to randomisation
• Treatment period, lasting seven days with once daily administration
• Post treatment period, lasting seven days A safety follow-up visit will be performed approximately 1 month after the first administered dose.

Inclusion Criteria:

• Healthy infants with diagnosis of infant colic according to the following modified Wessel criterion "paroxysm of irritability, fussing or crying that start and stop without obvious cause for >3h/day, >3 days/week for one week"
• Age ≥ 6 weeks and < 4 months
• No adequate response to conventional pharmacological or non-pharmacological treatment alternatives for infant colic
• Infants exclusively breast-fed.
• Normal growth
• Willingness to refrain from use of antimuscarinic drugs, simethicone, dimethicone or antiacids during the study period

Exclusion Criteria:

• Clinical evidence of allergies or other diseases which may cause crying and/or fussiness or may interfere with absorption or clearance of the drug.
• Suspect of gastroesophageal reflux disease (GERD)
• Formula fed or mixed fed infants.