To get near this attractive network size, social bots start by befriending each other. Next, the social bots solicit human users. As the bots and humans become friends, the bots drop their original connections with each other, eliminating traces of artificiality. Finally, the bots explore their newfound social network, progressively extending their tentacles through friends of friends.
Xopenex is the active isomer of albuterol (called R-albuterol or levalbuterol). 1  The chemical structures of medications exist as a mixture of mirror images of one another (referred to as a racemic mixture), and only one of these forms is the active medication.
Is Xopenex better than Albuterol? The available rescue inhalers available for the treatment of acute asthma symptoms. From left to right, ProAir HFA (albuterol), Proventil HFA (albuterol), Ventolin HFA (albuterol) and Xopenex HFA (levalbuterol). Daniel More, MD.