Do I use a TTEST to test whether treatment 1 and 2 controls blood pressure better? (see below) If I want to investigate two treatments (Treatment 1 and 2) to see which is better at lowering blood pressure (BP). The people in the clinical trial have been randomly allocated to be treated with either 1 or 2.
My dataset has:

*

*BP measurements before study

*BP measurements after treatment

*50 people in the study

I have done an initial exploratory analysis of
means, standard deviation, histograms to test normality and found my
data is normally distributed.
I've done a ttest in stata by treatment group:

*

*ttest baseline_BP == final_BP, if treatment==1 

*ttest baseline_BP == final_BP, if treatment==2 
Am I using the correct test for this? I'm not really sure how I'm meant to do this?

You don't want to test each group separately against the baseline, but you want to compare the two groups statistically. So you can either test if the final BP equals between 2 treatment groups, which does not take the baseline BP into account. Or you can take the baseline BP into account by testing if the difference between final and baseline BP equals between two groups, or you can test if the final BP equals between treatment groups corrected for the baseline BP using ANCOVA or MLR
