â¢Migraine headaches -- spots of light, halos, or zigzag patterns are common symptoms prior to the start of the headache. Other potential causes of vision problems include fatigue, overexposure to the outdoors (temporary and reversible blurring of vision), and many medications.
The usual initial dose of atenolol (Tenormin) for adult patients with hypertension is 50 mg taken once a day. The maintenance dose may be adjusted after a couple of weeks.
Initial dose in uncomplicated, mild to moderate hypertension is 400 mg daily, or twice-daily dosing may be required for adequate 24-hour blood pressure control. Optimal response is usually achieved with dosages of 400 to 800 mg/day; however, some patients have been maintained on as little as 200 mg/day.