Hi, Percocet, which is a combination of oxycodone and acetaminophen, is not known to cause blood thinning. However, it can cause drowsiness, dizziness, and impaired motor function, which can affect your ability to drive or operate heavy machinery. Soma (carisoprodol), on the other hand, is known to have sedative effects and can cause drowsiness, dizziness, and impaired motor function, which can also affect your ability to drive or operate heavy machinery. Both Percocet and Soma should be used with caution and only under the guidance of a healthcare professional. It is important to inform your doctor if you have been drinking alcohol, as this can increase the risk of side effects and potentially dangerous interactions with other medications. Regarding your question about blood alcohol levels, alcohol itself can thin the blood and increase the risk of bleeding, but it does not affect blood alcohol levels. The blood alcohol level is determined by the amount of alcohol present in the bloodstream, which is affected by factors such as the rate of alcohol consumption, body weight, and metabolism. If you have concerns about the effects of your medications or alcohol consumption on your health, it is best to speak with your healthcare provider. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician