This is an excellent question with a controversial answer. Up to very recently, doctors and dentists have insisted that people take antibiotics if they have heart murmurs (the regurgitation kind) or other things of this nature. Nowadays they are beginning to say it's not such a good idea because the antibiotics can cause problems. HOWEVER, if you've had pericarditis, which is VERY SERIOUS, I'd do exactly as your cardiologist or GP recommends.
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