I haven't taken that high of a dose, nor have I taken red vein, but the guidelines I've read suggest that at 10g you're likely to experience uncomfortable levels of nausea if you don't have tolerance.
someone like that should start with just a few grams, approximately a teaspoonful. it's also normal to not feel anything at all the first few times you take it.
for someone opiate dependent, that dose is enough to halt the physical symptoms of withdrawal and alleviate some of the emotional symptoms, albeit for a short time. if you want to quit opiate abuse badly enough, that's just about all you need.