A patient taking ethambutol (Myambutol) has received information about the medication. The health care provider should instruct the patient to immediately report which adverse effect?
a. Orange-red discoloration of bodily secretions
b. Difficulty detecting the colors red and green
c. Any onset of gastrointestinal (GI) adverse effects
d. Impaired sense of hearing
ANS: B
Ethambutol causes optic neuritis, which decreases ability to detect the colors red and green, and also decreases visual acuity.
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