ARBS refers to angiotensin receptor blockers, a type of medication used to lower blood pressure. There are several synonyms for ARBs, including angiotensin II receptor antagonists, angiotensin AT1 receptor blockers, and AT1 receptor antagonists. These medications work by blocking the action of a hormone called angiotensin II, which causes blood vessels to narrow. By preventing the hormone from working, ARBs allow blood vessels to relax and widen, thereby reducing blood pressure. Other alternative terms for ARBs include sartans, which is short for "angiotensin receptor blockers that end in -sartan." Some commonly prescribed ARBs include valsartan, losartan, and irbesartan.