Percocet affects the brain by increasing levels of dopamine, a neurotransmitter that is associated with pleasure, and the patient experiences relaxation. This can result in a Percocet high and lead to addiction. Acetaminophen helps to reduce fever. So this medicine can be used for fever. Consult your doctor and seek emergency medical attention if you are getting any allergic reactions or any side effects after using this. Use this medicine as prescribed by your doctor. Do not use this medicine for a long period of time, this can be habit-forming. Inform your doctor if you are taking anti-anxiety medicine Valium, Xanax, Ativan, Lexapro, Luvox, Klonopin, sleeping pills like Halcion and Sonata, or other pain relief medicine like Oxycodone, Gabapentin, Norco, Vicodin, Lortab, etc. Stop these pills after consulting your doctor.