Problem: A male client is diagnosed with chronic renal failure. The client routinely takes amantadine for Parkinson's disease with success. Why would the health care provider consider discontinuing the amantadine? Looking for Assignment Help? With amantadine, 50% of the drug is excreted via the kidneys. With amantadine, metabolism occurs in the kidneys. With amantadine, excretion is primarily via the kidneys. With amantadine, catabolism occurs in the kidneys.