iontocaine iontocaine iontocaine was an anesthetic medication, marketed under the two brand names numby and phoresor pm900 by iomed inc. it is a local anesthetic with vasoconstrictor, administered via iontophoresis through the skin. it can numb up to 10 mm of skin in as little as 10 minutes. it is a 2% lidocaine, 0.01 mg/ml epinephrine solution. it was manufactured by iomed, inc. iontocainecombination oflidocainelocal anestheticepinephrinevasoconstrictorclinical dataroutes ofadministrationtopicallegal statuslegal status us: approved in 1995, discontinued in 2005 identifierscas number54958-67-7 ycomptox dashboard (epa)dtxsid10970306 (verify) iontocaine was approved by the united states food and drug administration on 21 december 1995. it was discontinued by the manufacturer in 2005.