Alpha-methyldopa is primarily used for
**Core Concept**
Alpha-methyldopa is a centrally acting antihypertensive agent that works by stimulating the inhibition of sympathetic nervous system activity in the brain, thereby reducing peripheral vascular resistance and blood pressure.
**Why the Correct Answer is Right**
Alpha-methyldopa is primarily used to treat hypertension. It acts by entering the brain, where it is converted to alpha-methylnorepinephrine, which then binds to presynaptic alpha-2 adrenergic receptors, reducing the release of norepinephrine and subsequently decreasing sympathetic outflow. This leads to a decrease in peripheral vascular resistance and cardiac output, ultimately lowering blood pressure.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because alpha-methyldopa is not primarily used as an antipsychotic agent; its primary use is as an antihypertensive medication.
**Option B:** This option is incorrect because alpha-methyldopa is not primarily used to treat asthma; its primary use is as an antihypertensive medication.
**Option C:** This option is incorrect because alpha-methyldopa is not primarily used as an antiarrhythmic agent; its primary use is as an antihypertensive medication.
**Clinical Pearl / High-Yield Fact**
Alpha-methyldopa is often used in combination with other antihypertensive agents, such as diuretics, to achieve optimal blood pressure control. It is also worth noting that alpha-methyldopa can cause a rare but serious side effect known as a lupus-like syndrome.
**Correct Answer: D. Hypertension**