Acyclovir EP Impurity P is used as a pharmaceutical reference standard for the identification quantification and qualification of Impurity P during the quality control and stability testing of acyclovir drug substances and drug products according to European Pharmacopoeia (EP) requirements.

Its purpose is to ensure that the level of Impurity P in acyclovir complies with established pharmacopoeial specifications thereby supporting product quality safety and regulatory compliance.

Acyclovir EP Impurity P is a specified related substance listed in the European Pharmacopoeia and is supplied as a certified reference standard for use in validated analytical methods such as high-performance liquid chromatography (HPLC).