Can percocet cause a yeast infection?

Generally, no: Antibiotics and steroids and a few other Rx's can - but percocet alone is not related directly. Drink lots of water, avoid alcohol and harsh foods or smoking but definitely talk w/ the doctor who is treating you about all of this. I hope you feel better soon.

Not that I know of: while chronic overuse of certain opioids, particularly methadone, has been shown to cause some mild immune system problems in some patients, taking Percocet in usual doses should not cause this problem. Talk to your OB/GYN provider.