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st: Gen & replace commands

From   "Ziad El-Khatib" <>
Subject   st: Gen & replace commands
Date   Fri, 26 Oct 2007 09:42:14 -0700

Patient was using either "drug1" and "drug2".
I am trying to create new category to put the value of adherence to
the two drugs in one column (drugcat). Drug1 and drug2 have values of
1, 2, 3 or empty.

i tried

gen drugcat=0
replace drugcat=drug1 if drug1=1 | drug1=2 | drug1=3
replace drugcat=drug2 if drug2=1 | drug2=2 | drug2=3

it is giving invalid syntax.

Any tips?!
Thank you in advance and best regards
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