According to the research, how does losartan affect prorenin levels?

• A. It increases prorenin levels
• B. It decreases prorenin levels
• C. It has no effect on prorenin levels
• D. It stabilizes prorenin levels

Answer: (B)

Losartan is an angiotensin II receptor blocker (ARB) that primarily functions by inhibiting the effects of angiotensin II, a hormone that plays a key role in regulating blood pressure and fluid balance. Research indicates that by blocking the receptor for angiotensin II, losartan can cause an increase in plasma renin activity. In response to the decrease in angiotensin II levels, the body may try to compensate by producing more prorenin, which is the inactive precursor to renin. However, as losartan is taken, it leads to lower angiotensin II levels, which results in feedback mechanisms that can actually decrease circulating levels of prorenin. Therefore, it is supported by research that losartan decreases prorenin levels, contributing to its effects on blood pressure and overall cardiovascular health. This pharmacological action illustrates the complex interplay between different components of the renin-angiotensin system in response to medication.