Study to Evaluate the Efficacy of N-acetylcysteine (NAC) in the Treatment of the Common Cold and Cough

Inclusion Criteria: * Cold/URTI symptoms occurring no more than 4 days * cough due to a cold or acute viral (URTI) with an onset of no more than 3 days * cough frequency with specified cut-off Exclusion Criteria: * A subchronic, or chronic cough (cough duration \> 2 months) due to any condition other than a cold/URTI * Diagnosed as suffering from any pulmonary conditions associated with cough, e.g., chronic obstructive pulmonary disease (COPD), acute or chronic bronchitis, asthma, cystic fibrosis * Taking any medications known to induce cough * Fever of greater than 39°C (102°F) orally * Complication of the common cold like otitis media, severe sinusitis, or pneumonia * Other protocol-defined inclusion/exclusion criteria may apply