DON'T SHOOT HYDROCODONE!Especially hydrocodone with Acetomeniphen/Ibuprofen
Although its not as dangerous as IV codeine, hydrocodone still runs a high risk of massive histamine release, pulmonary edema etc, when administered intravenously. From the few people who have injected it, there was never any report of a rush, and the onset was not even immediate like IV oxycodone.
Scene it's been four months since you used any opiates, than I imagine you would most likely get a buzz off of 15mg of hydrocodone, but do you really want to? I had been clean after kicking a 90mg methadone habit for nearly nine months, when I decided to take the EXACT same ammount of hydrocodone as your contemplating consuming. I got super fucked up, and the next day I didn't even bother with the Hydro, I went straight back to shooting speedballs. Within three days my tolerance went from getting loaded off of 15mg of hydrocodone to feeling "kinda buzzed" off of shooting three bags of smack.
All preachiness aside, you should just pop them. Hydrocodone has a really high oral Bioavailability, making any other ROA pretty silly. I've heard that plugging them is decent, but really, why bother. The oral onset is pretty quick.