Therapeutic Effects, Adverse Effects and Toxicity

Evaluating Therapeutic Effects in Clinical Practice

A therapeutic effect is the desired, intended physiological response to a drug administration. When a nurse provides a medication, evaluating whether it is working requires looking at both objective measures and subjective reports. Objective measures include laboratory values and vital signs; patient-reported changes in symptoms are subjective measures used alongside them to evaluate treatment. For instance, just as a driver checks both the vehicle dashboard gauges and the smoothness of the ride, a nurse looks at clinical data together with how the patient feels to judge whether a therapy is successful.

Different drug classes have distinct benchmarks that demonstrate efficacy. For primary hypothyroidism, levothyroxine efficacy is assessed with serum thyroid-stimulating hormone and symptom improvement; in central hypothyroidism, free thyroxine rather than thyroid-stimulating hormone guides treatment. For loop diuretics, efficacy is demonstrated when the patient exhibits decreased peripheral edema, reduced daily weight, and clear lung sounds. In respiratory care, effective bronchodilator therapy is manifested by increased peak expiratory flow rates, decreased wheezing, and reduced dyspnea. Similarly, a therapeutic response to antibiotic therapy is evidenced by decreased fever, normalization of the white blood cell count, and the resolution of localized signs of infection.

Cardiovascular, hematologic, and metabolic therapies also require specific evaluative criteria. The therapeutic effect of antihypertensive agents is evaluated by sustained blood pressure measurements within the target range. Anticoagulant therapy is assessed by monitoring for the prevention or treatment of thrombosis and watching for bleeding; laboratory monitoring depends directly on the specific drug, such as monitoring the INR for warfarin or checking the aPTT or anti-factor Xa activity for unfractionated heparin. For metabolic management, glycemic control achieved through insulin or oral hypoglycemics is evaluated via point-of-care blood glucose monitoring and glycated hemoglobin levels.