<prompt> Ziconotide acts by blocking ?Voltage gated Na channelVoltage gated Ca channelLigand gated Na channelLigand gated Ca channel  <response>: Ans. isbi.e., Voltage gated Ca channelRef: Essential of pain medicine by HonorioBenmn p. 4581Ziconotide:Ziconotide SNX-111 ; Prialt is an atypical analgesic agent for the amelioration of severe and chronic pain.Acts as a selective N-type voltage-gated calcium channel blocker. 