A 14-year-old, male patient has some general concerns about eczema, as his twin brother was recently diagnosed with this condition. The patient reports urticaria and a rash on his posterior knees bilaterally. The three factors that put the patient at risk for eczema are a family history of eczema, a personal history of allergic rhinitis, and a history of:

A 14-year-old, male patient has some general concerns about eczema, as his twin brother was recently diagnosed with this condition. The patient reports urticaria and a rash on his posterior knees bilaterally. The three factors that put the patient at risk for eczema are a family history of eczema, a personal history of allergic rhinitis, and a history of:

No evidence indicates that patients who take vitamins:

The nurse is caring for a child who has ingested a toxic amount of aspirin. The provider orders an intravenous drug that will increase pH in the blood and urine. The nurse understands that this effect is necessary to:

A patient is taking a drug that has known toxic side effects. What will the nurse do?

It is a concept used to measure safety of drugs, and it is the ratio of the lethal dose divided by the therapeutic dose for $50 \%$ of population.