How should adenosine be administered for converting paroxysmal supraventricular tachycardia in adults and children over 50 kg?

Adenosine should be administered as a rapid intravenous (IV) bolus of 6 mg for adults and children over 50 kg. If conversion to normal sinus rhythm does not occur within 1-2 minutes, a second dose of 12 mg may be given, and this can be repeated again if necessary.