Email this page To: From: Subject: Message: About patient controlled analgesia (PCA) - Patient-controlled analgesia (PCA) allows the patient to give themselves pain medicine safely by pressing a button. Learn more about how PCA works. - https://www.stjude.org/treatment/patient-resources/caregiver-resources/patient-family-education-sheets/assess-control-pain/about-patient-controlled-analgesia-pca.html A summary of this page will be sent along with your message I am a referring physician Yes, I would like to receive email updates. Send Email Your message has been emailed successfully. Thank you for your interest in St. Jude Children's Research Hospital.