Which term means leaving the body?

A. Intramuscular: Intramuscular (IM) injections are absorbed faster than oral medications due to the richer blood supply in muscles compared to subcutaneous tissues.

B. Intravenous: Intravenous (IV) administration provides immediate systemic absorption as the medication is delivered directly into the bloodstream.

C. Topically: Topical medications are applied to the skin and generally have a slower absorption rate compared to systemic routes.

D. Transdermal: Transdermal patches provide a steady, controlled release of medication through the skin, but absorption is slower compared to IM and IV routes.

E. Oral pills: Oral medications are absorbed through the gastrointestinal tract, which is slower compared to IM and IV routes.

A. Therapeutic level: This is the correct answer. It refers to the concentration of a drug in the bloodstream at which it achieves the desired effect without causing toxicity.

B. Therapeutic index: This is a ratio that compares the toxic dose to the therapeutic dose of a drug. It does not refer to the point of optimal effect.

C. Toxic level: This refers to the concentration of a drug at which it becomes harmful or toxic. It is not associated with the desired effect.

D. Therapeutic range: This refers to the range between the minimum effective concentration and the toxic concentration of a drug. It does not pinpoint the optimal effect but indicates the safe range.