Murray came off court after 12:30 am and said he was itching to get home after the marathon five-set defeat, which lasted nearly five hours, but he was told to stay behind to give blood and urine.
"I'm just a bit annoyed," he said. "I know the players go on about it a lot, but they've changed these rules with the drug test. I've just done the drug test, the urine test.
"They just told me I need to sit down for 30 minutes before I can give blood.
"I want to get out of here, so I'm annoyed with that, which on top of losing a match like that, it's really a frustrating thing to have to go through at 1:00 in the morning."
Murray's team was seen adding substances to his water bottle during the 4hr 50min match, but he said there was nothing untoward.