Welcome to HCM and thanks for your query.
A a first step, terazosin and tamsulosin
are NOT given together as they have similar actions. This issue needs to be discussed with the prescribing doctor.
The description, to me, mean blood clots
They usually come from the bladder or the prostate.
It is wise to consult a urologist
early and do what is called hematuria evaluation, which is a series of tests including scan and cystoscopy
to look for a cause.
The treatment depends on the cause.
Hope things are clear now,