Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
fast or pounding heartbeats, fluttering in your chest, shortness of breath, and sudden dizziness (like you might pass out);
very slow heartbeats;
severe headache, blurred vision, pounding in your neck or ears;
racing heartbeats with dizziness, tiredness, or a lack of energy;
chest tightness; or
shortness of breath that is worse than usual.
If your baby is taking ivabradine, watch for symptoms of feeding problems, trouble breathing, or turning blue.
Ivabradine can cause a temporary brightness in your vision, especially during the first 2 months of treatment. This can make you see halos around lights, see colors within lights, or see multiple images while looking at an object. You may also see kaleidoscope colors or flashes of movement in certain parts of your vision. Sudden bright light can make these vision changes more noticeable. These effects usually go away as you continue taking ivabradine or after you stop taking it.
Common side effects may include:
slow or irregular heartbeats;
high blood pressure; or
your eyes may be more sensitive to light.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Ivabradine side effects (more detail)
