A nurse is reviewing the list of current medications for a client who is to start a new prescription for carbamazepine.
The nurse should identify which of the following medications interacts with carbamazepine?

Metformin is a medication used to lower blood glucose levels in people with type 2 diabetes. Metoprolol is a beta-blocker used to treat high blood pressure and heart problems. If the nurse accidentally gives metformin instead of metoprolol, the client may experience hypoglycemia (low blood sugar), which can cause symptoms such as sweating, shakiness, confusion, and loss of consciousness. Therefore, the nurse should check the client’s glucose level and treat hypoglycemia if needed.

Choice A is wrong because HDL (high-density lipoprotein) is a type of cholesterol that is not affected by metformin or metoprolol.

Choice B is wrong because thyroid function levels are not affected by metformin or metoprolol.

Choice C is wrong because uric acid level is not affected by metformin or metoprolol.

Uric acid is a waste product that can cause gout if it accumulates in the joints. Normal ranges for blood glucose are 70 to 130 mg/dL before meals and less than 180 mg/dL two hours after meals.

Normal ranges for HDL are 40 to 60 mg/dL for men and 50 to 60 mg/dL for women.

Normal ranges for thyroid function levels vary depending on the specific test, but generally they are between 0.4 and 4.0 mIU/L for TSH (thyroid-stimulating hormone), 4.5 to 11.2 mcg/dL for T4 (thyroxine), and 80 to 180 ng/dL for T3 (triiodothyronine).

Normal ranges for uric acid are 3.4 to 7.0 mg/dL for men and 2.4 to 6.0 mg/dL for women.

The correct answer is d. Administer the medication over 2 hr.

Choice A reason: Discarding the medication if it is yellow is not necessary. The color of amphotericin B lipid complex does not indicate its effectiveness or safety.

Choice B reason: Using a gravity flow set is not specifically required for the administration of amphotericin B lipid complex. Gravity infusion can be used to administer fluids and drugs where the rate is not critical and serious adverse effects are not anticipated. However, the use of a gravity flow set is not specifically mentioned in the guidelines for administering amphotericin B lipid complex.

Choice C reason: Priming the tubing with 0.9% sodium chloride is not recommended for amphotericin B lipid complex. This is because amphotericin B lipid complex is incompatible with saline solutions and should be diluted only with 5% dextrose injection. Priming the tubing is a common practice in IV therapy to remove air from the tubing before attaching it to the patient.

Choice D reason: Administering the medication over 2 hr is the correct action. Amphotericin B lipid complex is typically administered over a longer period, often 2-6 hours. This allows for a slow and steady delivery of the medication, which can help to minimize potential side effects.