6. 3. Orientation of storage of containers
Samples of the solutions, dispersed
systems and semi-solid drug
products for stability studies must
be kept upright and positioned
either inverted or on the side to
allow for full interaction of the
product with the container-closure.
This orientation helps to determine
whether the contact between the
drug product or solvent and the
closure results in the extraction of
chemical substances from the
closure components or adsorption
of product components into the
container-closure