Yes, XLS-Medical is safe to take with your rivaroxaban and levetiracetam.
Be sure to read the patient information leaflets and the dosage instructions provided by your doctor very carefully before use, so you can be sure that you're taking the correct dose of each treatment.
Reading the information leaflet will also help you to be sure that XLS-Medical is the right solution for you.
If you have any further questions, I'd recommend asking a pharmacist or your doctor for advice.