Medicinal preparation? Record heard wrongly? (7)

I believe the answer is:

ephedra

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'medicinal preparation?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'record heard wrongly?' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'wrongly?' is an anagram indicator (I've seen 'wrongly' mean this).
'heard' anagrammed gives 'hedra'.
'ep'+'hedra'='EPHEDRA'

Can you help me to learn more?

(Other definitions for ephedra that I've seen before include "Source of asthma medication" , "desert plant" .)

I've seen this clue in the Sydney Morning Herald.

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