The widespread use of immunosuppressive agents has significantly increased the rates of successful solid-organ and stem cell transplants, especially with liver and kidney. Cyclosporine and tacrolimus are most commonly used for this purpose. Although these agents have different mechanisms of action, both have various adverse effects, including nausea, vomiting, headache, hypertension, nephrotoxicity, and rarely epileptic seizures. In our first case, a patient presented with epileptic seizures and hemiparesis after a liver transplant, and posterior reversible encephalopathy syndrome related to cyclosporine toxicity was considered. Once cyclosporine levels in the blood decreased, the patient had both clinical and radiologic improvements. In our second case, a patient presented with delirium after a liver transplant. Again, when cyclosporine levels in the blood decreased, the patient showed improvement in clinical findings. Neurologic complications may develop after liver transplant, and these complications are encountered most frequently within the first postoperative month. Neurologic complications are multifactorial; insufficient graft function, intracranial bleeding, cerebral infarcts, infections, and immunosuppressive drug toxicity (tacrolimus and cyclosporine) may be considered among these factors. As shown in our presented cases, most neurologic complications can be successfully treated by correcting the underlying factor.