I take 50mg of atenelol in am but accidentally to another 50mg in about 15 minutes. Any problem or something I should do, like drink more or coffee etc>

This drug is used as a beta blocker usually for slowing the heart rate down; also used for hypertension (high blood pressure). I would suggest you go to emergency if you are experiencing symptoms of dizziness, vomiting, anything you would not usually experience. No, don't drink coffee, that is the worse thing you can do.

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