My DS was switched to the regular EpiPen when he was 7, even though he was 20 lbs under the recommended weight. The allergist said he did it because he found that kids that weight would almost always require a 2nd Epi Jr. shot. One regular Epi dose resulted in better outcomes, in his experience. When the allergist retired last year, we had to switch drs. The new dr. was confused about why my DS, then 54 lbs., had been prescribed a regular Epi, but renewed the prescription anyway, since he figured DS would probably gain a few pounds and be o.k. I trusted our previous dr., because he'd been practicing for over 40 years and seen it all when it comes to allergies.