This part of ISO 11418 specifies the design, dimensions, material and requirements of screw-neck glass bottles for pharmaceutical preparations in liquid form (syrups). Screw-neck glass bottles are applicable to primary packs used in direct contact with a drug. This part of ISO 11418 is applicable to screw-neck glass bottles used in pharmacy. Together with the corresponding closure systems, they serve for packaging of pharmaceutical preparations which are not intended for parenteral use. NOTE The potency, purity, stability and safety of a drug during its manufacture and storage can be strongly affected by the nature and performance of the primary pack.