You have 3 factors:
time (fixed effect, within-subject)
drug (fixed effect, between-subject)
subject (random effect)
This design is a split plot, and
anova response drug / subject|drug time drug*time, repeated(time)
should do the trick, if you want a univariate repeated measures ANOVA.
It is directly analogous to the example in the FAQ:
http://www.stata.com/support/faqs/stat/anova2.html#anovat77
-Dave
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