Big histamine relase. Happens a lot more with the "true" opiates
) than with synthetic or semi-synthetic. I find morphine gives more of a tingling "pins and needles" rush than say oxycodone
is similar but far less intense. I personally like the pins and needles. It's not as clean of a hit but I like it. You get more of a body rush from morphine than the synthetics.
But yeah, a lot of people are allergic to morphine and get that huge histamine relase. You might not get it when you use your meds orally but straight to the blood could do it.
Again, I've said this before but I want to repeat, morphine sulphate is only soluble at ~60mg/ml in h20. If you're using 1 CC rigs and add anymore than 60 mg of morphine, you're wasting your shit. Use bigger rigs or do multiple shots (not recommend though). If you can't get bigger rigs on the street or at your exchange and your pharmacy won't sell, order them online.
I'd use 3 CC, 26 gauge when I was shooting Kadian (morph sulphate time released capsules) and I'd use 2.5 mL of water for 120 mg. Crush beeds into powder, add water, gentle heat, filter very well, inject, lick up leftovers.
Oh, if you get a bad histamine release but still inject morphine, take some diphenhydramine
30 minutes before hand. You will have significantly less issues.