There is no guidance one performance of this type of testing for the human medicinal product industry. Two guidance documents do provide some direction ,and these will be considered. The CVMP aud ISO5 documents, one for veterinary products aud the other a draft standard for medical devices (contact lens care products), are consistent in lheir approach. The investigator is to dispense the product in a manner similar to its use and then test the chemical/physical properties aud preservative effectiveness at the end of the in-use period. Is this approach appropriate for medicinal products?