Carbidopa-levodopa is used to treat which condition?

Carbidopa-levodopa is used to treat which condition?

• A. Alzheimer's disease
• B. Multiple sclerosis
• C. Amyotrophic lateral sclerosis
• D. Parkinson's disease

Answer: (D)

Parkinson's disease involves a loss of dopamine-producing neurons, leading to slowed movement, stiffness, and tremor. Levodopa provides a building block for dopamine, but when given alone much of it is converted to dopamine outside the brain, causing peripheral side effects and limiting how much reaches the brain. Carbidopa inhibits this peripheral conversion, so more levodopa can enter the brain and the dose needed for benefit is reduced, which also lowers those GI and cardiovascular side effects. The combination is used to improve motor symptoms and daily functioning in Parkinson's, though it does not cure the disease and long-term use can lead to fluctuations and dyskinesias. Other conditions listed do not involve dopaminergic shortfalls treated by this medication. Alzheimer's disease, multiple sclerosis, and amyotrophic lateral sclerosis have different underlying pathologies and are managed with other therapies focused on cognition, immune or neuroprotective strategies, and supportive care.

Parkinson's disease involves a loss of dopamine-producing neurons, leading to slowed movement, stiffness, and tremor. Levodopa provides a building block for dopamine, but when given alone much of it is converted to dopamine outside the brain, causing peripheral side effects and limiting how much reaches the brain. Carbidopa inhibits this peripheral conversion, so more levodopa can enter the brain and the dose needed for benefit is reduced, which also lowers those GI and cardiovascular side effects. The combination is used to improve motor symptoms and daily functioning in Parkinson's, though it does not cure the disease and long-term use can lead to fluctuations and dyskinesias.

Other conditions listed do not involve dopaminergic shortfalls treated by this medication. Alzheimer's disease, multiple sclerosis, and amyotrophic lateral sclerosis have different underlying pathologies and are managed with other therapies focused on cognition, immune or neuroprotective strategies, and supportive care.