My grandmother is 72 years old and she has sinus tachycardia doctor prescribe her inapure 10 mg once a daily before meal at morning it's a extended release tablet. So is it safe to take this drug at this stage after recovering from viral pneumonia n after so much of medication is it chances of any kind of reaction due to many medication, she don't have any another problem related to heart despite of mild hypertension and sinus tachycardia.