<s>[INST] My husband has just been put on this medication Metoprolol ER 25 mg. This was on 6/4/18 last week. He is still having weak problems. He has taken his blood pressure/pulse today 2 different times, the first was 91/54 - pulse 91 and at 6:00 PM it was 81/44 pulse 91. So what do we need to do about this problem: [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. I would explain that his weakness could be related to the low blood pressure values. Atenolol has weak antihypertensive effects. Nevertheless,a reduction in the dose of Atenolol may be needed (or switching to Diltiazem). In the meantime, I would recommend increasing salt intake. Hope you will find this answer helpful! Wishing all the best, Dr. Iliri </s>