There are provided herein a system and a computer implemented method for preventing, mitigating or treating partial/complete loss of effect of one or more drugs or medical devices administered to or used by a subject in need thereof due to adaptation, tolerance, and/or tachyphylaxis, and/or for preventing, mitigating or treating non-responsiveness to one or more drugs, maximizing therapeutic effect of one or more drugs, or for improving target or non-target organ/organs response to therapy, the system/method include (processing circuit configured to): receiving a plurality of physiological or pathological parameters of the subject; applying a machine learning algorithm on the plurality of physiological or pathological parameters; and determining a subject-specific administration regimen of a drug or a medical treatment, wherein the administration regimen comprises drug administration parameters, cell/tissue/organ stimulation parameters, adjuvant parameters or any combination thereof; wherein the administration regimen is irregular.