Final answer:
Ms. Yan is likely taking an anticoagulant such as Coumadin to prevent another stroke. These drugs help prevent blood clots, and pharmacogenomics can guide dosage to minimize risks.
Step-by-step explanation:
The classification of drug Ms. Yan is taking to prevent another Cerebrovascular Accident (CVA), commonly known as a stroke, is likely an anticoagulant. Anticoagulants are drugs that help prevent blood clots from forming or from becoming larger, which is crucial in reducing the risk of a subsequent stroke. One such drug is Coumadin (warfarin), which is frequently prescribed to stroke patients to prevent excessive blood clotting. It is crucial to monitor the dosage closely due to the risk of overdose, especially since liver function can affect how the drug is processed in the body. Pharmacogenomics can be useful in this scenario as it involves studying how a person's genetic makeup affects their response to medication, which could help tailor the dosing of Coumadin to reduce the risk of overdose and increase the effectiveness of stroke prevention.