Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Treat any suspected venomous snake bite as an emergency.
Call the local emergency number or poison centre immediately, even if the wound looks minor and you feel well.
Get emergency help for:
Avoid unnecessary movement and wait for emergency transport when available.
Routine follow-up is appropriate for wound review, repeat blood tests, rehabilitation, and symptoms that are improving slowly without emergency warning signs.
After discharge, seek urgent medical advice for renewed bleeding, increasing swelling, fever, worsening wound changes, reduced urine, new weakness, or breathing difficulty.
A rash, fever, or joint pain in the days or weeks after antivenom may be serum sickness and needs prompt assessment, but it is not usually an emergency unless breathing problems, facial swelling, or collapse occur.
And for anyone, someone who:
The article also says
Do not drive yourself if symptoms are developing.
Every sign above is quoted from the sofidex article on Snake bites. If you are not sure, err upward — it is always reasonable to be checked.