Other symptoms include fatigue, drowsiness, general muscle weakness, and visual disturbances such as blurring of vision, yellow-green or white halos around visual images,
[medical-dictionary.thefreedictionary.com]
It can be used to treat congestive heart failure, a condition in which the heart muscle is weak and unable to pump blood effectively to the rest of the body.
[livestrong.com]
What you should do about this interaction: If you experience slow heart rate, nausea, vomiting, diarrhea, loss of appetite, weakness, or muscle cramps, contact your healthcare
[webmd.com]