Tryptamine420
Bluelighter
Warning: The dosages mentioned below are on the extreme side. reaching the 4th plateau and/or sigma on dxm is not safe & although I have done exactly what I will describe many times without any harm done, that does not mean you will, do not try this at home 
So, despite what some may think, reaching the 4th plateau & also plateau sigma on dxm can be a little trickier than just dosing high. For some, its that easy, but for others, like me, you run into a few problems.
The first is vomiting.
The problem with puking is mainly that you lose a lot of the dxm you've ingested. If you try to hold it in, it often results in a lingering nausea ruining the rest of the trip. What I usually do, since my stomache is sensitive to dxm & it almost always makes me puke, is dose low first. Not too little, but not a whole lot. Most of it is coming back up anyways. I usually use around a 200mg dose of dxm only syrup. It kicks in the high just enough to induce vomiting. Now, once I vomit on dxm for some reason on another, Im not able to vomit again that night regardless of how high I dose. So, after the initial dose kicks in & the first puke session is over, you can pretty down the rest of your high dose.
or
this may not work for everyone, but I find the only food I can eat with dxm & not vomit is ramen noodles. I have no clue why, but I never puke when I eat ramen noodles, I may be extremely nauseous & feel the need to, but I never can. The problem here is you have to ride out the nausea the whole trip or until you forget about it. The other thing about ramen noodles is, the broth helps that nasty syrup taste go away & also makes your stomache feel better while it all slides down in there & it also for me, makes swallowing coricidin or any other pill for that matter easier. I don't know why, it just does.
The second roadblock is the taste/texture of the syrup and/or swallowing pills.
As I mentioned above, the ramen noodle broth when warm helps to make the syrup taste go away & the syrup doesn't want to stick to & coat your throat so much. It also makes swallowing pills easier, I think because of the oily texture of the liquid the pills slide down nicer & don't make you want to gag after the first 5.
The third is, if your not an asshole, price.
dxm isn't that expensive but if your a tight wad or your a broke high school kid, for under $20 you can obtain an 8 oz bottle of dxm only robitussin or its generic equivelant from a cvs. If your under 18 this doesn't apply but walmart, dollar general, family dollar, etc. have their own generic versions of coricidin which are still usually in a purple & white box, may be harder to distinguish for the idiots, but look at the ingredints, its exactly the same, but it costs $2 instead of $8. cvs also has their own generic brand but its $6 rather than $2. The separate trip is worth the $6 on c's you save, I say this because cvs doesn't have the cheap coricidin & its usually the only place I can find an 8 oz bottle of dxm only syrup.
Now that we've gotten past the problems, ill explain my method of reaching 4th plateau & also sometimes sigma. I do not recommend it, its dangerous, but if your a die hard dxm user, you probably wont listen to me anyways.
Anyways, i have a high dxm tolerance. ive been using it to trip on & off for years as well as a wide range of other drugs & this has always worked for me.
The routine is as follows: I hit someplace for an 8 oz dxm only bottle of syrup, usually cvs. Then i run off to a dollar store for a single $2 box of coricidin (which isn't far, my town has 5 dollar stores all just a block or two apart & all close to the cvs). I then proceed to drive home, pop my coricidin out & stick them in a cup for later. Just as up there in the puking section, i drink just enough of my syrup to get me high just enough to puke, this is just so i don't vomit with a large amount of dxm in my stomache when i vomit & waste it, after the intial purge in finish my bottle of syrup, usually it takes 6 or 7 big mouthfuls chased with something that's not sweet (usually ramen noodle broth, beer, or grape fruit juice, the white kind not ruby red) anything sweet makes the syrup taste extra nasty. I like to take a few minutes in between drinks of syrup to let my taste buds recover. Now, your whole bottle of syrup is gone, you can start on the coricidin. i like to take 8 & then 15minutes later the other 8.
You do not by any means need to finish all of the 1200mg described above to reach 4th plateau. If your body says stop, i cant handle it anymore, your probably going to hit your mark. don't push it. ive stopped before i finished all that dxm many times & still got where i wanted to be.
So, despite what some may think, reaching the 4th plateau & also plateau sigma on dxm can be a little trickier than just dosing high. For some, its that easy, but for others, like me, you run into a few problems.
The first is vomiting.
The problem with puking is mainly that you lose a lot of the dxm you've ingested. If you try to hold it in, it often results in a lingering nausea ruining the rest of the trip. What I usually do, since my stomache is sensitive to dxm & it almost always makes me puke, is dose low first. Not too little, but not a whole lot. Most of it is coming back up anyways. I usually use around a 200mg dose of dxm only syrup. It kicks in the high just enough to induce vomiting. Now, once I vomit on dxm for some reason on another, Im not able to vomit again that night regardless of how high I dose. So, after the initial dose kicks in & the first puke session is over, you can pretty down the rest of your high dose.
or
this may not work for everyone, but I find the only food I can eat with dxm & not vomit is ramen noodles. I have no clue why, but I never puke when I eat ramen noodles, I may be extremely nauseous & feel the need to, but I never can. The problem here is you have to ride out the nausea the whole trip or until you forget about it. The other thing about ramen noodles is, the broth helps that nasty syrup taste go away & also makes your stomache feel better while it all slides down in there & it also for me, makes swallowing coricidin or any other pill for that matter easier. I don't know why, it just does.
The second roadblock is the taste/texture of the syrup and/or swallowing pills.
As I mentioned above, the ramen noodle broth when warm helps to make the syrup taste go away & the syrup doesn't want to stick to & coat your throat so much. It also makes swallowing pills easier, I think because of the oily texture of the liquid the pills slide down nicer & don't make you want to gag after the first 5.
The third is, if your not an asshole, price.
dxm isn't that expensive but if your a tight wad or your a broke high school kid, for under $20 you can obtain an 8 oz bottle of dxm only robitussin or its generic equivelant from a cvs. If your under 18 this doesn't apply but walmart, dollar general, family dollar, etc. have their own generic versions of coricidin which are still usually in a purple & white box, may be harder to distinguish for the idiots, but look at the ingredints, its exactly the same, but it costs $2 instead of $8. cvs also has their own generic brand but its $6 rather than $2. The separate trip is worth the $6 on c's you save, I say this because cvs doesn't have the cheap coricidin & its usually the only place I can find an 8 oz bottle of dxm only syrup.
Now that we've gotten past the problems, ill explain my method of reaching 4th plateau & also sometimes sigma. I do not recommend it, its dangerous, but if your a die hard dxm user, you probably wont listen to me anyways.
Anyways, i have a high dxm tolerance. ive been using it to trip on & off for years as well as a wide range of other drugs & this has always worked for me.
The routine is as follows: I hit someplace for an 8 oz dxm only bottle of syrup, usually cvs. Then i run off to a dollar store for a single $2 box of coricidin (which isn't far, my town has 5 dollar stores all just a block or two apart & all close to the cvs). I then proceed to drive home, pop my coricidin out & stick them in a cup for later. Just as up there in the puking section, i drink just enough of my syrup to get me high just enough to puke, this is just so i don't vomit with a large amount of dxm in my stomache when i vomit & waste it, after the intial purge in finish my bottle of syrup, usually it takes 6 or 7 big mouthfuls chased with something that's not sweet (usually ramen noodle broth, beer, or grape fruit juice, the white kind not ruby red) anything sweet makes the syrup taste extra nasty. I like to take a few minutes in between drinks of syrup to let my taste buds recover. Now, your whole bottle of syrup is gone, you can start on the coricidin. i like to take 8 & then 15minutes later the other 8.
You do not by any means need to finish all of the 1200mg described above to reach 4th plateau. If your body says stop, i cant handle it anymore, your probably going to hit your mark. don't push it. ive stopped before i finished all that dxm many times & still got where i wanted to be.

z bottles of pure dxm containing syrup into 1oz of lemony deathly tasting fluid. You won't end up with lighter fluid in the final product if you do it right and you can possibly avoid a lot of stomach issues and the whole "oh man it's gross" thing.