My metrodonizale gel says it expired on 5/17 its 11/17 can i still use it?

Probably OK, but...: Drug expiration dates are very conservative. Drugs are not necessarily less effective or have increased risk of side effects after the expiration date. It's just that they haven't been tested beyond that date. But unless stored unsafely (e.g. an especially hot area, like in a car on hot days), they usually are fine. However, for a new infection, best not to self treat. See a doctor to confirm.