Patient information leaflets (PILs) are leaflets included with medicines that provide users with information about the product's medical conditions, doses, side effects, and safe and effective use. PILs are written by pharmaceutical companies and must be included with all licensed medicines. They should include essential information without being too long or having small text. Common language should be used to make the information understandable. PILs must be regularly reviewed and updated to reflect current medical knowledge. They provide identification of the medicine, therapeutic uses, precautions, administration instructions, what to do if a dose is missed, side effects, interactions, and storage information.