A client with a leukemia has been placed on methotrexate. Which of the following mechanism of actions below describes this medication?
Stops fungal growth
Alters pH level
Inhibits replication by blocking folic acid synthesis
Inhibits helper T Cells
The Correct Answer is C
A. Stops fungal growth: Methotrexate is not an antifungal medication. This mechanism of action applies to drugs like azoles or polyenes, which are used to treat fungal infections.
B. Alters pH level: Altering pH is a mechanism used by some antacids or alkalinizing agents, not methotrexate.
C. Inhibits replication by blocking folic acid synthesis: Methotrexate is an antimetabolite that inhibits dihydrofolate reductase, an enzyme involved in folic acid synthesis. This inhibition impairs DNA synthesis, which is crucial in treating leukemia and other cancers.
D. Inhibits helper T cells: This mechanism of action is more closely related to immunosuppressive agents like cyclosporine or tacrolimus, which are used for preventing transplant rejection.
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Correct Answer is D
Explanation
A. Tendon rupture: Tendon rupture is not a side effect associated with estrogen blockers.
B. Phlebitis: While thromboembolic events are a risk, phlebitis (inflammation of a vein) is not a typical concern.
C. Increased risk of lymphomas: Estrogen blockers are not known to increase the risk of lymphomas.
D. Thromboembolic events: Estrogen blockers, such as tamoxifen, are associated with an increased risk of thromboembolic events (e.g., deep vein thrombosis, pulmonary embolism).
Correct Answer is B
Explanation
A. Uterine cancer: No known contraindications exist between this condition and sulfamethoxazole/trimethoprim.
B. Client taking captopril for hypertension: Sulfamethoxazole/trimethoprim can increase potassium levels, and captopril (an ACE inhibitor) also raises potassium levels. Using these drugs together increases the risk of hyperkalemia, a dangerous condition.
C. Osteoporosis: This condition does not contraindicate the use of sulfamethoxazole/trimethoprim.
D. Multiple Sclerosis: No known contraindications exist for this condition with sulfamethoxazole/trimethoprim.