Hippy drug in flipping medication (4)

I believe the answer is:

acid

I'm a little stuck... Click here to teach me more about this clue!

'hippy drug' is the definition.
'acid' can be an answer for 'drug' (acid is a kind of drug). I am not sure about the 'hippy' bit.

'in flipping medication' is the wordplay.
'flipping' says the letters should be written backwards.
'in' indicates a hidden word.
'dica' can be found hidden inside 'medication'.
'dica' in reverse letter order is 'ACID'.

Can you help me to learn more?

(Other definitions for acid that I've seen before include "Acerbic" , "Corrosive fluid" , "Chemical compound" , "Sour to the taste" , "bad rain" .)

I've seen this clue in the Irish Times.

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