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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

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 ...

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

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.