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2.
a derivation of "pothead" -- one who fiendishly (i.e. compulsively) consumes medically-approved pharmaceuticals in a non-medicinal (i.e. recreational) manner
"He sure gobbles down that Percodin! What a medhead!"
by Doktor Fill April 13, 2003
 
1.
A drug user, legal or otherwise
I take Advair, Clarinex, Serevent, and Singulair for my Asthma. You could say I'm quite the medhead.
by curtis x meyer December 08, 2010