old thread is old.
don't IV doxylamine, or any antihistamines at all for that matter. There's no point whatsoever. If you, for whatever odd reason, really want to use a stronger ROA for a non-recreational sedative, than plug it, but don't IV it, man, that's just not worth the risks associated with IV use, you might as well be banging Alka Seltzer (that's a joke, DON'T do that).
IVing OTC medications is just beyond stupid!
•there's no rush, or even any recreational "high" to speak of
•It's OTC, which means that you shouldn't be worrying about supply, seeing as you could get a whole bottle of 32 doxylamine pills for less than the price of a pack of cigarettes, and if you run out, you can always go back to the pharmacy, since they aren't drug dealers, and will always have common OTC medications in stock.
•IV use is only "worth it" (It's never worth it to IV ANYTHING, but I'm speaking relatively) when users are addicted/highly tolerant to substances like cocaine, meth, heroin/certain opiates, and other similar drugs. IV and IM use of ketamine is fairly commonplace (moreso with IM) and is "worth it" as well, but IM ketamine users IME have not always been addicts, so I'm categorizing IV ketamine differently than opiates and stimulants.
Rectal administration is the next best thing, with essentially the same bioavailability, although a slightly slower onset, and with many drugs, it has a longer duration that most other ROAs. If you need to take your antihistamines using a strong ROA, simply use rectal, it's the safest ROA aside from oral, with most drugs. If you're not comfortable with that, than micron filtering and IMing would be a similar experience, although less safe. Honestly, if you're IMing or IVing things that don't give you a rush, just plug them.
However, the common characteristic of these drugs is that they are tolerance-building, addictive (aside from DMT), and IVing them is a much higher level of experience (higher enough to accept the risks of IVing), so IVing it does serve a purpose, while IVing OTC sedative antihistamines probably has very little, if any, difference in effect (aside from the higher BA, oral BA for Doxylamine is 30%, and I assume IV is 100% ), nor any significantly faster onset (Doxylamine crosses the BBB very slowly, IVing won't do much to help that), nor any rush, or even any recreational "high".
At this point, I'm actually interested to know why you want to do this in the first place... if you intend to shoot it with heroin (to potentiate), well that's not only a bad idea, but the Doxylamine won't take effect unil you're already an hour or so into the heroin high, and any potentiation is gone to waste...
I'm gonna go back and read the original post, all that^ was simply a response to the thread title lol
Oh, nvm, this thread was from captain heroin's "HEROin Adikkt" days, so it's excusable for him.
Let the above post just be a general PSA for anybody thinking about slamming OTC antihistamines.