I'm a heart surgery nurse. Yesterday a very serious thing happened while I was working with a colleague who has just finished her internship. I trust her very much. But for the last couple of days she still has to be accompanied with meds. One patient was in a lot of pain, and my colleague took oxycontin 5mg extended release. She administered it, I just didn't check if he had already received it, because I thought she already checked. But in fact, he already took it at 12:00 and we gave her another one at 19:30. In the evening he developed a psychosis and wanted to go to another hospital. I didn't give the medicine but I signed with my colleague. Obviously the responsibility is mine because my colleague is not yet officially autonomous. I feel deeply guilty for not checking and I can't forgive myself. I don't know what to do, I can't do this profession anymore, I'm not attentive and intelligent enough. But I really need support and I can't talk without crying