When administered every three weeks, the list price of KEYTRUDA at each suggested dosage is $11,337.36. When administered every six weeks, the stated price for each recommended dosage of KEYTRUDA is $22,674.72.* The majority of consumers won’t pay the listed amount, yet it might affect your out-of-pocket expenses. Your insurance condition is one of several factors that will determine how much you pay. Based on your insurance situation, the information below will help you make an accurate estimate of how much you would spend on your prescription medication. It also covers any possible financial aid that you may be eligible for… If you have insurance, speak with your provider about the specifics of your plan; otherwise, get in touch with your oncologist’s office to find out how much your treatment will cost out of pocket.