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 care for:
Bleeding that is heavy or will not stop
Vomiting blood or passing black, tar-like bowel movements
A sudden severe headache, confusion, weakness, or vision change
A significant head injury when your platelet count is low
Sudden chest pain, shortness of breath, or coughing blood
New painful swelling in a leg or arm
Cold, painful, or discolored skin on a limb
These symptoms may indicate serious bleeding or a blood clot.
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 a healthcare professional promptly if you develop unexplained bruising, petechiae, repeated nosebleeds, bleeding gums, blood in the urine, or much heavier menstrual bleeding after starting or restarting a drug.
3
Does any of this apply?
Book an appointment
Attend planned blood tests even if you feel well.
Bring a complete list of medicines, supplements, occasional remedies, and recent hospital treatments.
And for anyone, someone who:
is having side effects from a medicine, or is struggling to take it as prescribed
Every sign above is quoted from the sofidex article on Drug-induced thrombocytopenia. If you are not sure, err upward — it is always reasonable to be checked.