Can I go to Bulgaria with an Italian visa?

yes. Because the Bulgarian government recognizes that single, double or multiple entry visas, long-term residence visas and residence permits issued by Schengen countries, Romania, Croatia and Cyprus enjoy equal rights with Bulgarian transit or stay visas.

Entry or stay in Bulgaria with any of the above documents is limited to the period of validity, and cannot exceed 9 days in every 6 months.

with the above documents, the number of times to enter Bulgaria is equal to the number shown in the validity period of the visa, even if the visa has been used in the above countries.