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There are plenty of blood pressure medications that are not beta blockers. Generally you can tell if a medication is a beta blocker because they end in "-olol" (Propranolol, metoprolol).
There are smooth muscle relaxants that can be used such as hydralazine.
There are ACE Inhibitors like captopril, lisinopril, or enalapril that block the angiotensin converting enzyme.
There are ARBs or Angiotensin receptor blockers like losartan.
And there are also nitrates like isosorbide mononitrate (Imdur)...so no not all blood pressure medications are beta blockers, but perhaps your physician put you on one because they thought that was the most specific to your needs. Ask your physician if another med would work just as well.
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