From today, Government marketers will be required to get approval from the Efficiency and Reform Group on spending over £100,000, up from £25,000, when the controls were announced in May.
Explaining the change, a Cabinet Office spokeswoman said the raising of the threshold is an attempt to put in place "sustainable measures", which will last until the end of the spending review period in 2015.
She said: "The initial controls were short, sharp, shock measures designed to put a quick curb on spending."
Since the coalition Government came to power, it claims to have saved £133m on advertising and marketing.
In total, the efficiency measures across the civil service, which also include a freeze on recruitment and consultancy, are expected to deliver more than £3bn in savings by the end of the financial year.
Danny Alexander, chief secretary to the Treasury, said: "A seismic shift in Whitehall's spending culture is needed and, building on the measures we have already taken, these new controls are the next stage in delivering that change."
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