50mg/day is releativly an average dose of Atenolol. The most common dosage averages about 100mg/day and can increase to 200 in adults.

However, several reactions can cause fatigue in patients using Atenolol. These adverse reactions include effects on the Central nervous system, drug toxicity or overdose, and because Atenolol is a beta-blocker that lowers blood pressure, the drug design itself can cause fatigue.

When there is no solution to the unexplained fatigue, it is known as unresolved fatigue.
Unresolved fatigue is an adverse reaction of Atenolol and may be one of the many reasons patients discontinued the drug.

Atenolol is a beta-blocker and works to lower blood pressure by blocking substances that would otherwise speed up the heart and increase the pressure at which it pumps blood. The more medicine you take, the lower your blood pressure gets: this spells fatigued.

When the blood pressure gets dangerously low, you could face sudden death. Inadequate blood flows to the heart, brain, and other vital organs.

You should ask your doctor about Losartan. Patients using Atenolol are more likely to discontinue the drug due to side effects than were patients using Losartan.

You should also check your blood pressure every time before and after you take your medication and record the results. Monitoring your blood pressure can help let your Physician know what your blood pressure reading are and aide your Physician in determining which dosage is right for you.

Hope this answers your question!

REFERENCE(S)

1. Jacqueline A. Hart, M.D., Blood pressure - low (Online: University of Maryland Medical Center (UMMC), 2004). http://www.umm.edu/ency/article/003083.htm

2. President & Fellows of Harvard College, Blood Pressure (Online: President & Fellows of Harvard College, 2001) http://www.health.harvard.edu/fhg/fhgupdate/K/K1.shtml

3. The Medical University of South Carolina, Atenolol (Online: Medical University of South Carolina, 2006) http://www.musc.edu/pharmacyservices/Drugs/A/Atenolol.htm