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Answer for the clue "Poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it ", 15 letters:
pseudoephedrine

Word definitions for pseudoephedrine in dictionaries

Wiktionary Word definitions in Wiktionary
n. A sympathomimetic alkaloid commonly used as a decongestant; a chemical compound, an isomer of ephedrine, with the formula C 10 H 15 NO.

WordNet Word definitions in WordNet
n. poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it

Wikipedia Word definitions in Wikipedia
Pseudoephedrine ( or ; PSE ) is a sympathomimetic drug of the phenethylamine and amphetamine chemical classes . It may be used as a nasal/sinus decongestant , as a stimulant , or as a wakefulness-promoting agent . The salts pseudoephedrine hydrochloride ...

Usage examples of pseudoephedrine.

The tox screen revealed significant levels of cannabis, alcohol, and pseudoephedrine, probably from an OTC decongestant.

Some over-the-counter cough syrups contained the chemical compound pseudoephedrine, needed to make methamphetamine.

Triprolidine is the active ingredient found in Actifed and pseudoephedrine, a nasal decongestant found in many over-the-counter cold remedies.