Probably neither: I am not a big fan of beta blockers for hypertension, but if you have no other choice, the better option would probably be toprol xl as atenolol is not a once a day drug. The carrier for your drug is likely what you're allergic to, not the drug itself, explaining the reason why you're allergic to metoprolol and not lopressor (metoprolol tartrate).
Answered 6/21/2015
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