SLC22A5 and systemic primary carnitine deficiency disease: Octn2 regulation can be also important in understanding of secondary carnitine deficiency, known to be induced by several drugs, since OCTN2 is widely recognized as a drug transporter and among its substrates are β-lactam antibiotics, as well as oxaliplatin, varapamil, mildronate, valproate, imatinib and quinidine [9], [10], [64], [65].