Before taking this medication, inform your doctor if you are allergic to Nadolol; or to other beta blockers (e.g., atenolol, propranolol); or if you have any other allergies in general.
Before using this medication it is always best to go over your medical history with your doctor, especially if you have had the following; certain types of heart rhythm problems (such as a slow heartbeat, second- or third-degree atrioventricular block), blood circulation problems (such as Raynaud's disease, peripheral vascular disease), breathing problems (such as asthma, chronic bronchitis, emphysema), heart failure, kidney disease, mental/mood disorders (such as depression), a certain muscle disease (myasthenia gravis), skin conditions (such as atopy, psoriasis), overactive thyroid disease (hyperthyroidism), a certain type of tumor (pheochromocytoma).
This medication may make you dizzy, drowsy, and can cause yu to faint. This is likely to occur within 1 hour after taking the medication. Mostly when you have just started the treatment, or when your doctor may increase your dose.
If you have diabetes, this product may mask the fast/pounding heartbeat you would usually feel when your blood sugar falls too low (hypoglycemia). Other symptoms of low blood sugar, such as dizziness and sweating, are unaffected by this drug. This product may also make it harder to control your blood sugar. Check your blood sugar regularly as directed and share the results with your doctor. Tell your doctor right away if you have symptoms of high blood sugar such as increased thirst/urination. Your doctor may need to adjust your diabetes medication, exercise program, or diet.