The state Medical Examining Board Tuesday disciplined four doctors, including fining a Hamden doctor $3,500 for allowing medical assistants to give patients medication, including a nasal anesthetic. The board also reprimanded the physician, Craig Hecht, an ear, nose and throat doctor, after the state Department of Public Health found he failed to maintain appropriate infection controls in his Madison office, a consent order he signed with the board said. The order said he kept expired medications, failed to follow proper sterilization procedures and failed to keep appropriate sterilization records. Hecht also has offices in Hamden and Milford, but the problems were confined to his Madison office, the order said. Hecht chose not to contest the allegations while admitting no wrongdoing.