Italy was forced to pay more to investors to sell three year and 15 year bonds amid the country's continuing political uncertainty.
The Italian Treasury said it raised €5.32 billion - less than the €5.5 billion on offer - in today's sale that tested market sentiment for the third-largest economy in the euro zone.
Interest rates on 15 year bonds rose to 4.9% from 4.8% in February with three year bonds' interest rates rising to 2.48% from 2.3% last month. Demand for both was 1.28 times the offer.
Last month's national elections ended in a deadlock with no clear winner. Parliament convenes for the first time on Friday, paving the way for talks on forming a new government to begin next week.