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UniMed UniHealth Pharmaceuticals LtdProduct Description
The combination of Levodopa and Carbidopa is the gold-standard pharmacological treatment for Parkinson's disease, engineered to optimize the delivery of dopamine to the brain while minimizing systemic side effects. Levodopa, a metabolic precursor to dopamine, is capable of crossing the blood-brain barrier where it is decarboxylated into active dopamine to replenish depleted levels in the striatum, thereby alleviating motor symptoms such as bradykinesia, rigidity, and tremors. However, when administered alone, more than 95% of Levodopa is converted to dopamine prematurely in the peripheral tissues by the enzyme aromatic L-amino acid decarboxylase (AAAD), leading to significant nausea, vomiting, and cardiac arrhythmias. Carbidopa, a peripheral decarboxylase inhibitor that does not cross the blood-brain barrier, is added to the formulation to block this peripheral conversion. By "protecting" Levodopa in the bloodstream, Carbidopa ensures that a much higher concentration of the precursor reaches the central nervous system, allowing for a lower effective dose of Levodopa and a drastic reduction in gastrointestinal and cardiovascular toxicity. Despite its efficacy, long-term use is often associated with the "wearing-off" phenomenon and levodopa-induced dyskinesias, necessitating precise dosage adjustments and the eventual transition to controlled-release formulations or the addition of adjunctive therapies to maintain a stable therapeutic window.
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