Can antibiotics treat shingles?

No. Shingles is medical condition caused be reactivation of the virus that causes chickenpox (varicella). Antibiotics (used to treat bacterial infections) are not routinely used, unless the treating physician believes that a bacteria such as strep or staph has infected the skin involved with the shingles. Antivirals, however, are useful for the treatment of shingles.
No. Shingles is caused by a virus, not a bacteria, so antibiotics will not work on it. An antiviral medication may be used however. Sometimes, antibiotics are prescribed if the skin lesions get infected because then skin bacteria may cause a secondary infection.