The old ones still exist, just the current ones for level 56+ no longer have reusable versions.
Small note: The Exotech/Rakata reusable adrenal for tanks is better than the newer adrenal because it provides armor instead of shield and absorb value, so it guarantees damage reduction instead of just increasing the chance for damage reduction. So this one is still worth it. All others are replaced by the new, more powerful, non-reusable adrenals.