Medications With Best Oral Bioavailability?

[smithrob9999]

I have severe back pain from riding motocross for years and while I don't have a ton of medication I have Rox, D, and Hi Dro. I hate to take anything other than the prescribed method. I've heard that with D the oral bioavailability is low. Any idea of the others ? What about O p a ?

 

[two]

Oxi and hydro will have the highest oral bioavailabilities outta the 0ps if I recall correctly.