LD50s are pretty useless for determining safe dosing in humans. We are not rats or mice. For example I've seen the LD50 of IV heroin listed as 57 mg/kg in mice, which would mean that it would equate to over 3 g in a 120 lb person (an insanely high dose), while I've seen people OD on 25 mg. A dose being substantially under the LD50 does not make it safe.
Also tolerance is a HUGE factor.
All you can do is as NT said:
NeighborhoodThreat said:
find a source that is consistent in its potency and to titrate your dosing up slowly (don't drink it all at once) until you get to where you want to go.
What is a safe/pleasant amount of poppy seed tea for you is GREATLY variable. I would not start off with half a pound, it might make you really sick.
cook said:
Too bad that just doesn't work with opioids, at least I need to take the full dose at once to get a decent effect. Titration just ruins everything.
I disagree. You may not get quite as high if you are doing a titration where you are redosing every few hours, (although this also depends on the specific opioid and the person), but it doesn't "ruin everything" and you can do a different form of titration, like if you take a certain amount one day you can take a larger dose the next day or time you do it and so on. Titration is really the only safe way to determine an appropriate dose of an opioid that gets you where you want to be yet isn't bordering on dangerous. Especially with poppy seed tea which can vary SO MUCH.
For example, the morphine content in poppy seeds can vary by
125 times (meaning one batch could have 125x more morphine than another batch). One of the main ways people OD on seed tea is by assuming that they are safe to take their usual amount when they get a new batch. In most fatal ODs on PST the dose they took and the tolerance they had is unknown, someone just found them dead.
I have seen starting dosages for PST listed as ~200 g of seeds (just under 1/2 a lb).
One study which tested the morphine and codeine content of several different types of seeds found that the seeds they tested ranged from 2–251 mcg of morphine per g, and 0.4–57.1 mcg codeine per g. Using these figures that would make the dose for 200g of seeds
up to 50 mg of morphine and up to 11 mg of codeine. If we said the codeine was equivalent to about 2mg morphine, then we could estimate that 200g of seeds is not very likely to be equal to more than roughly 52mg of morphine (although it's possible there are seeds out there even stronger than the strongest ones they tested). For comparison, starting doses of oral morphine given for pain in someone with a low opioid tolerance are ~10mg. It may be very possible that the seeds you have aren't nearly that strong, but it's always better to assume that they could be. 52 mg of morphine would be a lot for someone with no-low opioid tolerance, even if it might not kill you it would be unpleasant. Also I'm not sure how the other alkaloids in the tea could affect you or add to the risks.
TL;DR - Coming up with a dose for PST is pretty impossible. You have to start low and experiment.