<prompt> Which drug is likely to cause livedo reticularis?GabapentinAmantadinePramipexoleLevodopa  <response>: Ans. B. AmantadineAmantadine is antiviral agent used in parkinsonism. It increases the dopamine levels by inhibiting its reuptake and have anticholinergic effect. It causes discoloration of skin, livedo reticularis as side effect. 