Drugs associated with high risk of iatrogenic harm Class of drug Strategies for reducing risk of iatrogenic harm Warfarin Use optimal monitoring systems Immunosuppressants Warn against chickenpox and offer varicella-zoster immunoglobulin as needed Corticosteroids Use prophylactic measures for osteoporosis Warn against chickenpox and offer varicella-zoster immunoglobulin as needed Non-steroidal anti-inflammatory agents Caution in groups at high risk (for example, over 75 years old) Antidepressants Match drug to patient and his or her lifestyle Lithium Caution in suicidal patients Use optimal monitoring systems General Education of patients Concordance Interactions with other drugs Ensure all parts of medical system are aware the patient is taking these drugs