What right does the client have in regards to medication administration?

I think a patient should have more right to get pain relief than what they do now. Because, I might hurt myself and it hurt extremely badly, but you may hurt yourself and it is beyond any pain you have ever had before in you life. If you say you are in pain a doctor should take it just as that and it's in the oath he takes as a doctor to keep his patient out of pains way.