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
Call emergency services for collapse, severe confusion, difficulty waking, or other signs of severe dehydration or circulatory problems.
And for anyone, someone who:
you believe has taken an overdose or swallowed something poisonous
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
2
Is any of this happening?
Be seen today
Contact the cancer team promptly if symptoms occur during immunotherapy.
Seek urgent medical care for:
Blood or black, tar-like stool
Fever with frequent diarrhea
Severe or increasing abdominal pain
Repeated vomiting or inability to keep fluids down
Very little urine, marked dizziness, confusion, or fainting
A swollen abdomen with severe pain
Frequent watery diarrhea during or after antibiotic treatment
And for anyone, someone who:
is vomiting and cannot keep fluids down
3
Does any of this apply?
Book an appointment
Arrange medical advice if diarrhea began after starting or changing a medicine, lasts more than a few days, keeps returning, or interferes with eating, sleep, work, or usual activities.
And for anyone, someone who:
is having side effects from a medicine, or is struggling to take it as prescribed
The article also says
Children, older adults, pregnant people, and those with kidney disease, heart disease, weakened immunity, or serious ongoing illness may need earlier assessment.
Every sign above is quoted from the sofidex article on Drug-induced diarrhea. If you are not sure, err upward — it is always reasonable to be checked.