There are no formulations of hydrocodone available in a parenteral form, because, like codeine, significant pulmonary edema would result- very bad for you- it can cause death rather quickly. As far as I know, oxycodone is the only member of the 'codone family' (itself a thebaine derivative, though...), that can be safely injected, w/o the risk of P.E...
It (hydro) can (like codeine) be given IM, but unless you have the amps designed for it, I wouldn't do it, just because IM is a good way to get some nasty abcesses, if the product is not close to 100% pure (USP).
Unless this grosses you out, I'd suggest performing a CWE on your hydrocodone, and make youself a nice 'hydro enema'. For real...
But since the oral bioavailability w/ hydo is so high, just drink it down. To get the most absorption from your gut, though, about 20-25 min. before you dose, drink some baking soda water (about 3/4 tsp. in approx- 1/3 cup of water). It won't work miracles, but it'll help a bit w/ the absorption.
Now another thing you might want to try, is to take some cimetidine (OTC- Tagamet). Cimetidine is a pretty potent inhibitor of the hepatic (liver) enzyme (CYP-2D6) that helps to break down hydrocodone in your system. It works for me anyway...
It doesn't make it hit you that much harder, but it increaes the duration of it quite a bit...Hope this helps 'ya..