 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] G), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death). Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using erythromycin safely. Erythromycin may cause live bacterial vaccines (such as typhoid vaccine) to not work well. Tell your health care professional that you are using erythromycin before having any immunizations/vaccinations. Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products). Some erythromycin products may contain sodium. Ask your doctor or pharmacist for more information if you are on a salt-restricted diet or if you have a condition such as congestive heart failure that could be worsened by an increase in salt intake. Older adults may be more sensitive to the side effects of this drug, especially hearing loss and QT prolongation (see above). Babies may be at higher risk for a certain serious stomach problem. </s>