If the med makes you sleepy, by all means take before bed...or at you last meal if it requires a meal and you take only once a day.
I have taken as much as 200 mg of Metoprolol, 100 morning and 100 night. That really knocked me down. As I as after was a slower heart rate, which it did help. I am surprised if it causes a fast HR for you, may be something else.
I now take 50 mg once a day, and I take it after my evening meal. I think it still has some unwanted side effects, but not too bad, no more dizziness when I stand up quickly, well not most of the time.
I believe Metoprolol, like all/most medications, are tolerated differently by the using population. Some have little or no side effects, some just can't take it. This is something that will have to be worked out for your specific case to get the best results There are alternatives. I have not used any of the alternatives.
Also, you're just starting out, you may "adjust" to it and have a better tolerance to side effects. If you're taking 50 or less mg a day, my guess is you'll get adapted to the medicine.
I've been on 300 mg of Metropolol, 3 times a day. It's like taking a sleeping pill. I had some really interesting hallucinations and it took a week on that dose, to drop my bp and pulse to the point where I ended up in the hospital for bradycardia and toxic reactions to the meds. Just be careful with this med.
Wow, 300 mg, I assume you to say you had taken 100 mg tablets three times a day for a total of 300 mg in 24 hours. That's a lot and I understand you having big time reactions.
I was in a cardio rehab program while recovering from heart surgery when I went to 200 mg (100 twice a day). That pushed my BP so low that the nurses in the rehab program were worried, and would keep me after the exercise to be sure I got my BP back up to some minimum (forget, mabye 80/50 or some where in that range). Of course I had problems with dizziness. Being almost 6'6" tall may have aggravated the low BP situation.
Sorry, the last post mixed up who said what. My response was a reaction to your post.