You're trying to qualify for a paid drug study and your BP is borderline high?
Okay, look, even if you DO qualify for the study, they're going to be monitoring your vitals, the first time they test you and your BP is high, they're going to throw you out, and now you've created a "false" side effect of the drug increasing blood pressure.
Worst case scenario, the drug potentially HAS the side effect of increasing your blood pressure, and won't that be a pretty pickle?
There are better ways to make extra money.