listen man im going to tell you how to do this. not because i think its smart, it has never caused anything but heartache and sickness for me and everyone ive known to use. there is no party to injecting drugs. its a whole new level of addiction and few survive. you said that you only wanted to try it because you was wanting to knock the edge off of a cocaine high. thats a very bad idea, so is injecting opiates and mixing benzos. both can and probably will kill ya. not only that but its a miserable feeling, its not going to make you feel good! amount ve dosed doesnt mean anything. it could be the small amount that causes your heart to stop. my guess is your a full blown addicit and your curious and are going to try it anyway, so here you go.
differant kinds of morphine are done diff ways depending on the brand. the best way for ones that gel is to take the coating off the pill first. stick it in your mouth till the coating comes off. (just a little bit of saliva carries thousands of harmful bacteria. its real easy to lose an arm by licking the spoon and injecting or anything similar) but since the first thing you will do after the caoting is removed is boil the water. this will kill the bacteria once you have dropped the pills into it. about 1cc for each pill, if there the kind that gels. you will want to add an extra cc to compensate the gel. once the water is boiling, boiling to much will not burn the dope out. so boil the water, drop the uncoated pills into the spoon. have a filter ready you can use a q-tip but its not advised, its possible and does happen quite often that you may get what junkies call cotten fever and shake uncontrolabley. (it sucks!) the best filter to use would be a clean ciggarette filter. drop it in and draw up as quickly as possible. there will be gel left. the gel still contains dope. so just repeat the process. it depends on your body size but around 8cc maybe less i weight 220pds. but it will cause a water headache and they are misreable! make sure you get all the AIR out of the rig. it doesnt take alot of air to kill you! and its simple to get out. so get it out. make sure the needle is sterile. again i dont advise you doing this! it will be quite simply the dumbest thing you will ever do! but if your going to do it anyways, atleast do it right! good luck, i hope your one of the ones that can tell people about how sick and miserable you were when you done it back in the day and hope that day your still young, but i doubt it works out that good for ya!