I took it 3 hours ago and my heart rate is still the same. I am a 43 female. My heart rate has been between 95 to 160. I had been taking 25mg and just moved up to 50mg.
"Metoprolol starts to work after about 2 hours, but it can take up to 1 week to fully take effect."
Do contact your Dr. if you require further instructions from him/her.
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