You should be aware that Percocet can cause drowsiness and sleepiness. You should avoid operating any heavy machinery, or engaging in long drives. You should also avoid any situation where drowsiness could potentially endanger yourself or others. There are certain medications that you can also cause drowsiness, and you should be careful about taking them when you are using Percocet. For example, you should avoid buying sleeping pills, muscle relaxers, and cold or allergy medicine when you buy Percocet. Be careful not to take Percocet with any alcohol, as this can exacerbate the drowsiness that this drug may cause. You should also avoid and anti-depressants, anxiety medications and treatments for seizures unless you have consulted your doctor beforehand.