They both contain adrenaline, but in different amounts. EpiPen® contains 0.3mg, and EpiPen® Jr contains 0.15mg. Selection of the appropriate dosage strength for the patient is determined by the prescribing physician according to patient body weight.
EpiPen® auto injector 0.3mg is recommended for adults weighing >25kg.
EpiPen® Jr. auto injector 0.15mg is recommended for children weighing between 7.5 – 25kg. For children weighing more than 25kg, EpiPen® auto injector 0.3mg (adult formulation) is recommended.