Final answer:
The nurse should look in the indications section of a drug handbook to find out if a drug has more than one use, which details the conditions the drug can treat.
Step-by-step explanation:
A nurse preparing to administer a drug to a client and looking to determine if the drug has more than one use should consult the indications section of a drug handbook. This section provides information on the medical conditions or diseases for which the drug is authorized to be used.
Pharmacokinetics is crucial in understanding how a drug is absorbed, distributed, metabolized, and excreted in the body, and the dosage and route of administration are key to ensuring that therapeutic drug levels are reached without causing significant toxicity.