- Subject has used any of the following medications within 6 hours before first study drug administration, or is anticipated to use any of these medications at any time throughout the study: Any inhaler, medicated confectionary, throat lozenges, throat pastilles, sprays, any products with demulcent properties such as chewing gums and boiled sweets or mints, Any medication for sore throat containing a local anaesthetic, Cold products and oral nasal decongestant products, Paracetamol or any NSAID