Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Seek emergency help now if heavy urination or intense thirst occurs with:
Confusion, unusual drowsiness, or difficulty waking
Fainting or a seizure
Deep or unusually rapid breathing
Repeated vomiting or inability to keep fluids down
Severe weakness or signs of shock, such as cold, clammy skin
Very high glucose or ketones together with symptoms of DKA or HHS
If you have diabetes, follow your emergency and sick-day plan.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Do not delay urgent care while trying to correct severe symptoms with extra drinks or additional medicine on your own.
Arrange same-day medical advice for a sudden major increase in urine, persistent dizziness, a very dry mouth, positive ketones, or high glucose that is not improving according to your established plan.
A routine appointment is appropriate for ongoing large urine volumes, repeated nighttime urination, or increased thirst without urgent symptoms.
Keep a record of fluid intake, urine frequency, glucose readings if available, and recent medicine changes.
Every sign above is quoted from the sofidex article on Osmotic diuresis. If you are not sure, err upward — it is always reasonable to be checked.