post hoc for dependent comparisons

#1
Hello, I have got 7 subjects. We measured their blood pressure at 3 time points before taking a drug, during effect and later on. I carried out a 1-way repeated-measures Anova, tested sphericity, but I do not understand which post hoc test I can carry out. Just paired t-tests reducing my alpha with bonferroni or sidak corrections?

Thank you in advance,
Stefano