TEHRAN — The Islamic Republic announced a ban Thursday on imports of 75 so-called luxury products, ranging from high-end cars to coffee to toilet paper, part of efforts to promote domestic products and stem the outflow of dollars and other foreign currency as Western economic pressures increasingly choke off Iran’s commerce and critical oil revenue.

It is the most sweeping measure so far to batten down the Iranian economy, although the move is not likely to leave showrooms and store shelves empty.