Taking 200 mg clonazepam at once is extremely dangerous. Normal dose is only 0.25-2 mg. Such an overdose can cause unconsciousness, stopped breathing, coma, or even death - especially if mixed with alcohol or other medicines.
Next Steps
If someone has taken this, they need emergency medical help immediately (go to ER).
Health Tips
This is a serious situation. Along with urgent medical care, counselling support is also important - you may reach out to me for guidance.