Do you always use an alcohol prep pad before giving an IV push medication? Has anyone ever heard the threory that using alcohol prep pads to clean a stopcock before giving IV push meds is not useful unless it sits for at least 3 minutes first and is allowed to dry? I have also heard that wiping with an alcohol prep pad and then immediately pushing meds can cause harm to the vein. I have worked with nurses in an ICU where 50% used alcohol prep and 50% did not when giving medications IV push.