and polystyrex dextromethorphan
Dextromethorphan hydrobromide is the shortest acting form of over-the-counter (OTC) cough syrups (i.e. hydrobromide forms are usually taken every 4-6 hours, while polystyrex forms are a extended release, taken every 12 hours.
The two are evenly matched, per se; the difference is how quickly the body metabolizes the two different sub-ingredients of dextromethorphan.
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USP means it is listed according to USP. “The United States Pharmacopeia (USP) is an official authority setting public standards for all prescription and over-the-counter drugs and other health products manufactured or sold in the United States.” HBr stands for hydrobromide. Chemically describes the type of solution. Most of the time it doesn’t mean anything to the consumer, but it is a technical designation. Another designation for drugs is HCL (hydrochloride). I am a registered nurse.
Dextromethorphan is dextromethorphan, but polystyrex takes much longer to metabolize into dextrorphan, which is what most people really want when taking DXM. Delysm says durable, I say doubly ineffective. But I understand it tastes much better, so you gotta go.