John applies Benadryl cream to an area of his arm where he has an insect bite that itches. Nancy walked in a wooded area near her home and now has hives appearing in multiple are

John applies Benadryl cream to an area of his arm where he has an insect bite that itches.
Nancy walked in a wooded area near her home and now has hives appearing in multiple areas on her face, hands, legs, and arms. The doctor has diagnosed this as poison ivy. He prescribed Benadryl tablets.
Ben takes digoxin for chronic congestive heart failure. Ben’s physician always orders a dig level (lab test) to monitor how well his kidneys and liver are metabolizing and excreting the drug. The lab test on his last visit shows a higher than normal amount of digoxin in his system.
June takes the diuretic, HCTZ, as one of her hypertension medications. Her physician monitors her potassium level frequently, and on the last visit, added a potassium supplement to her regime because her potassium level was lower than normal.