<prompt> A patient of parkinsonism is managed with L-dopa. If Vit. B-complex is administered concurrently-The action of L-dopa in brain will be potentiatedDecarboxylation of L-dopa in brain will be decreasedSide effects will be amelioratedDecreased efficacy will result  <response>: Ans. is d i.e., Decreased efficacy will result Pyridoxine abolishes the therapeutic effect of levodopa by enhancing peripheral decarboxylation of levodopa. 