Will it hurt to take your blood pressure medicine twice within a 12 hour period?

It depends entirely upon what your doctor prescribed.

Some blood pressure meds are to taken once per day---- some, twice per day.

It is only your family practice Doctor Who can best answer this.

IMO ---- from one who suffers from high blood pressure ---- yes, I have taken a second does of my BP meds within a 12 hours period, if I thought it was necessary.

My BP dropped from 130/90 to a comfortable 118/78 ---- perfectly acceptable and within "normal range".

Be careful of this. There is such a thing as "too low of a drop in BP".

You need to have your BP checked, if you intend to add an additional "within 12 hour" period.

Again, only your doctor can tell you what is acceptable --- we, on this forum, can not. None of us (unless there is a doctor on this forum) can provide a responsible answer to your post.

Best of luck. Regards .....