I am surprised not to say shocked at any health professional failing to prescribe antivirals when a patient presents with shingles provided they have presented at the appropriate time
This advice makes sense
Several antiviral medicines—acyclovir, valacyclovir, and famcivlovir —are available to treat shingles and shorten the length and severity of the illness. These medicines are most effective if you start taking them as soon as possible after the rash appears. If you think you have shingles, contact your healthcare provider as soon as possible to discuss treatment
Too late - and there is little or no point,
However it is accepted practice when the patient is within the early days of the illness and antivirals can also be prescribed as a prophylactic. When I had shingles some years ago, , a faxed prescription was sent to the nearest Boots to my DH’s office where he worked Monday-Friday on Bournemouth so that he could start the course ASAP. . (We lived in N Bucks ) As he was immunosuppressed, shingles could have been even nastier than it is for the rest of us.