Dizziness or tiredness may occur. If either of these effects lasts or gets worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Ivabradine may rarely cause vision changes such as brief increased brightness, or seeing halos or colored bright lights. Sudden changes in light brightness may set off this effect. If vision changes happen, they usually start within the first 2 months and may go away during treatment or after stopping this medication. Tell your doctor right away if you have any serious side effects, including: slow/fast/irregular heartbeat, fainting. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Other medications can affect the removal of ivabradine from your body, which may affect how ivabradine works. Examples include azole antifungals (such as itraconazole, ketoconazole), macrolide antibiotics (such as clarithromycin, telithromycin), diltiazem, HIV protease inhibitors (such as nelfinavir), nefazodone, rifamycins (such as rifabutin, rifampin), ritonavir, St. John's wort, verapamil, drugs used to treat seizures (such as carbamazepine, phenobarbital, phenytoin), among others.