The state Medical Examining Board on Tuesday disciplined six doctors, including fining a Norwalk doctor $5,000 for prescribing high doses of opioids to a prison inmate and other patients without proper safeguards. The board also suspended the license of a family medicine physician from Westport, saying his excessive drinking of alcohol presents a “clear and immediate danger” to the public. In the Norwalk case, the board also reprimanded Dr. Martin Perlin and limited his ability to prescribe painkillers. Between 2013 and 2015, Perlin prescribed high doses of opioids without adhering to standard safeguards, state Department of Public Health records show. One of the patients was incarcerated during the time that Perlin prescribed drugs for him, the records show.