Using drugs to intentionally loosen memory's grip

Presumably good for PTSD and the like.
One of the side effects of the hypertension drug propanolol is memory problems. This treatment experiment, however, administered the drug during measured stressful recollection of trauma that occurred ten years back. Apparently, by disrupting the phase of restoring a memory after recollection, the researchers were able to reduce the anxiety associated with the memory.
Although the second experiment mentions that the U0126 drug used is known to induce limited amnesia, there's otherwise nothing in the article to suggest that a memory itself has been erased; it could be just the emotional association.