Non-medicinal ingredients.

Many drug products contain excipients which perform important functions in terms of stability, solubility and identification. Excipients should not be considered as inactive ingredients, as they have been associated with a wide range of adverse reactions in some individuals. Monitoring for excipient toxicity is important. Equally important, is the provision of non-medicinal ingredient information on packaging, patient information leaflets and prescribing information, as most excipient-related toxicity is preventable when the formulation is known.