Rebuild the missing context
Assume the recipient will not remember every date, promise, or earlier conversation. For a message about how to support someone with bipolar disorder, use this factual base: reflect what the person has told you, any immediate concern, and the practical context without diagnosing them.
Say what needs to happen next
State the decision, information, or practical action you need and include a real deadline only when one exists. Offer one manageable form of support and ask directly about safety when you have a serious reason to worry. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Avoid making urgency into pressure
Do not shame, threaten, promise secrecy about imminent danger, or make yourself the only source of help. If someone may harm themselves or another person, contact local emergency or crisis services and a trusted nearby person now. Do not make the other person responsible for reducing the discomfort that prompted you to write.