Before using betaxolol, tell your doctor or pharmacist if you are allergic to it; or to other beta blockers (e.g., timolol, metipranolol); or if you have any other allergies. This product may contain inactive ingredients (such as preservatives like benzalkonium chloride), which can cause allergic reactions or other problems. Talk to your pharmacist for more details. This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: certain types of heart rhythm problems (e.g., sinus bradycardia, second- or third-degree atrioventricular block), certain serious heart conditions (e.g., cardiogenic shock, severe heart failure). If you develop an eye infection or injury, or have eye surgery, check with your doctor about whether you should continue to use your current bottle of betaxolol. You may be advised to start using a new bottle. If you are wearing contact lenses, remove them before using eye drops. Wait at least 15 minutes before replacing your contact lenses. Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: drugs for high blood pressure (e.g., clonidine, oral beta blockers such as propranolol, calcium channel blockers such as diltiazem), epinephrine, fingolimod.