The Efficacy of a Probiotic for Antibiotic Associated Gastrointestinal Symptoms

Participants in this arm will receive a daily dose of 2x10\^9 Colony Forming Units (CFU) of a multi strain probiotic (live bacterium), corresponding to 2 capsules twice daily, for the duration of antibiotic therapy, and 14 days thereafter.

Participants in this arm will receive an equivalent placebo for for the duration of antibiotic therapy, and 14 day thereafter.