Thanks for your question on Healthcare Magic. I can understand your concern. Yes, your all symptoms are due to hypotension and bradycardia caused by lopressor. Lopressor is having metoprolol. It is beta blocker. It acts on reducing blood pressure and heart rate. You have given lopressor just for prophylaxis before aneurysm surgery. So possibility of hypotension is more in your case. So you are can cut down the dose to 12.5 mg. Drink plenty of fluids orally and keep yourself hydrated. Don t worry, you have done right thing by cutting down the dose. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.