MRCP2-1410

MRCP2-1410

A 46-year-old man is admitted to the psychiatric ward due to experiencing visual hallucinations for the past two days. He has a medical history of membranous glomerulonephritis and underwent a renal transplant last year. He is currently taking immunosuppressants.

Upon examination, there are no signs of focal neurology. The patient’s cranial nerves I to XII are normal, with reactive pupils that are equal in size. There are no cerebellar signs, but the plantars are equivocal on the left and downgoing on the right. The patient’s AMTS score is 8 out of 10. An urgent CT head scan shows no abnormalities.

Which medication could be a possible cause of the patient’s symptoms?