Reddit reviews Children’s Robitussin Cough Long-Acting (4 fl. oz, Fruit Punch Flavor), 8-Hour Cough Suppressant, Alcohol-Free, Ages 4+
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Includes one 4 fl. oz. bottle of Children’s Robitussin Cough Long-Acting liquid cold medicineUp to 8 hours of cough relief in a single dose of alcohol-free Children’s Robitussin cough syrupLong-acting cough suppressant helps reduce the urge to cough to help kids feel better longerFormulated for kid’s cough syrup with a great fruit punch flavorPersistent cough formula with the active ingredient Dextromethorphan HBr, a cough suppressant, to help control a cough
So I did some research into what inactive additives specifically cause nausea/diarrhea, and I have found the culprit. Sorbitol, which is a sugar-alcohol sweetener substitute, is apparently the main cause of most users significant nausea, vomiting, and diarrhea. It supposedly has a very strong laxative effect. I've been reading that they didn't use to put it in syrups or gels, but unfortunately they put it in almost all of them now, not including polistirex varieties. If not sorbitol, they often use sucralose, which seems to have similar undesirable effects. I can't help but feel like this is intentional, to make recreational dosing less pleasant.
Fortunately, I did some digging and found the holy grail of syrups on Amazon, although in somewhat lesser concentration, meaning you would have to take more. I feel like that wouldn't be as bad as the nasty stomach complications, like with every other HBr+ source I've found. Not sure if you would be able to find this anywhere in any stores. I've certainly never seen such a good catch.
As for the gel-caps, possibly, but not by a large margin compared to a syrup. The outer coatings dissolve relatively quick, but if you take them incrementally rather than all at once, it will be like re-dosing, so your peak will hit you in waves, and increase in DXM toxicity. Personally, I cannot down enough for a recreational dose very quick, so I used to poke them with a thumbtack, express them with pliers, and mix it in some really masking beverage, since it tastes just god awful. You could also dissolve the coatings in ginger ale, to reduce waste, but I never bothered.
Honestly, you either put up with gel-caps and the sorbitol pains, or you can try that syrup without any of that crap, and hope the syrupy weight doesn't bother you. I would figure I should handle the fullness much better than a stomach irritant/laxative, on my come up.
I'd say your best bet for easy on the stomach, and for good DXO potential, is through an extraction of some sort, preferably the Agent Lemon: Dual-Phase Acid-Base Extraction of DXM.