If I recall correctly I'd suggested you take 15 mg. That really is the ideal starting dose for an opiate-naive individual. BUT, with 7.5 mg you will feel something, and it will be good. Opiates are subtle, but don't worry that they aren't working, they are. Let the opiate roll over you, and envelope you. Just do what you feel and enjoy yourself. My first oipiate experience was 5 mg oxycodone, which is about equal to 7.5 mg hydrocodone, but I upped my oxy dose to 10 mg, and the first time I did I hydro I did 15 mg, hit me strong, but nice. I did another 15 mg the next day, and it was still very pleasurable, but not as intense. Maybe it is good you took only 7.5 mg, but if you want to do it again, try not to be like me and do it the next day. Wait a few days, at least. If 7.5 mg is pleasant, but you want more of an opiate experience try 15 mg next time. I wouldn't redose with another pill, because that will feel weaker than 15 mg all at once. Just enjoy your experience, and guage your opiate response. But 7.5 mg should get you feeling really good, a def. mood lift, relaxed, maybe stimulated.