Apparently you don't have a legal prescription for either medication and this is the reason people who take this medication responsibly and do not abuse it have problems getting this medication filled due to substance abuse so I will not contribute to whatever you are "seeking". Also 500mg of Oxycodone would kill a person instantaneously. The medication is 5mg of Oxycodone and 500mg of Acetaminophen. If you continue to post questions such as these, since this isn't your first, I will do what I need to do so you cannot continue. Thank you.
It depends, which is better for you is up to your Heath Care Provider. You need to discuss with your doctor the problem you have that requires this medication. It can be dangerous and is highly addictive and your doctor is the only one who can properly prescribe the correct amount to reduce the risks.
This would depend on the individual's body weight, tolerance, pain level and doctor's judgment. These narcotics are typically prescribed for people in severe pain. If too much is taken it can suppress the respiratory system to the point of death. These are prescription medications and tightly controlled for this reason.