You Do Need power plug adapter while traveling from Italy to Guyana.

Here is Why You Need An Adapter

The outlet and plug type used in Guyana are A, B, D and G and in Italy are C, F and L. This is how they look like.

Italy

In Italy, outlets of type C, F and L are in use.

Type C

Type F

Type L

Guyana

In Guyana, outlets of type A, B, D and G are in use.

Type A

Type B

Type D

Type G