A patient presents a new prescription for glipizide XL 10 mg. The patient has been taking the following medications regularly for the past year: Metformin 500 mg twice daily, Procardia XL 30 mg daily, Lisinopril 20 mg daily, Glyburide 5 mg twice daily. Therapeutic duplication exists between glipizide and:

Rationale

Therapeutic duplication exists between glipizide and glyburide.

Both glipizide and glyburide are sulfonylureas, a class of medications used to lower blood glucose levels in patients with type 2 diabetes. Prescribing both simultaneously can lead to increased risk of hypoglycemia due to their similar mechanisms of action.

A (Procardia XL) YOUR ANSWER

Procardia XL (nifedipine) is a calcium channel blocker primarily used to treat hypertension and angina. It does not share any pharmacological properties with glipizide, as they act on different pathways in the body. There is no therapeutic duplication between these two medications.

B (glyburide) CORRECT

Glyburide is also a sulfonylurea like glipizide, making it a direct duplicate in terms of therapeutic action. Both medications stimulate insulin secretion from the pancreas, and using them together can enhance the risk of adverse effects, particularly hypoglycemia, thereby constituting therapeutic duplication.

C (metformin) YOUR ANSWER

Metformin is a biguanide that works primarily by decreasing hepatic glucose production and improving insulin sensitivity. It is commonly used in combination with sulfonylureas for better glycemic control, but it does not duplicate the action of glipizide, as they have different mechanisms of action.

D (lisinopril) YOUR ANSWER

Lisinopril is an ACE inhibitor used for managing hypertension and heart failure. It does not interact pharmacologically with glipizide, nor does it replicate its therapeutic effects. Therefore, there is no therapeutic duplication between lisinopril and glipizide.

Conclusion

In summary, therapeutic duplication occurs when two medications in the same class are prescribed simultaneously, increasing the risk of adverse effects without providing additional therapeutic benefit. In this case, glipizide and glyburide both belong to the sulfonylurea class, leading to potential hypoglycemia when used together. Other medications in the patient's regimen—Procardia XL, metformin, and lisinopril—do not present this issue, as they act through different mechanisms.

Therapeutic duplication exists between glipizide and glyburide.

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