The present invention relates to extended-release pharmaceutical dosage forms of carbidopa and levodopa comprising: a first component comprising a first portion of carbidopa and levodopa; a second component comprising a second portion of carbidopa and levodopa; and a third component comprising a third portion of carbidopa levodopa and carboxylic acid. The present invention also relates to processes for the preparation of said extended-release pharmaceutical dosage forms. The present invention further relates to a method of treating Parkinson's disease by administering said extended-release pharmaceutical dosage forms.

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