Legislation that would allow doctors to prescribe lethal medication to terminally ill patients who request it is now going to the Vermont Senate Judiciary Committee. The measure — dubbed ‘‘end of life choices’’ by supporters and ‘‘physician-assisted suicide’’ by opponents — sped through the Senate Health and Welfare Committee last week, winning approval Friday on a 5-0 vote. It is expected to have a bumpier ride in the Judiciary Committee, which could send it to the Senate floor with a recommendation that it be defeated. The measure is expected to see action in the full Senate next week; it hasyet to see action in the House.