![]() According to ivabradine's package insert, luminous phenomena are typically described as a transiently enhanced brightness in a limited area of the visual field, halos, image decomposition (stroboscopic or kaleidoscopic effects), colored bright lights, or multiple images (retinal persistency). These adverse reactions to ivabradine are called luminous phenomena or phosphenes. Patients may also more simply explain that they're "seeing stars" or having "fuzzy" vision changes. They may describe them as bright halos or colored bright lights that interfere with their ability to see clearly. ![]() Sheridan, MS, RPh, respond: Some patients using ivabradine, a hyperpolarization-activated cyclic nucleotide-gated channel blocker indicated to treat heart failure, may complain of vision disturbances such as bright spots that don't go away in certain parts of their field of vision. What should I teach my patient about these?-T.W., UTAH The labeling lists "luminous phenomena" as a commonly reported adverse reaction. My patient with heart failure has been prescribed ivabradine.
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