Assuming you are talking about adding coolant to your car:
It is generally advised that you do not drive your car immediately after adding coolant. This is because the coolant needs some time to circulate in order to properly do its job. Additionally, if you have a leak, driving right away can cause the coolant to leak out more quickly. If you must drive, be sure to keep an eye on your temperature gauge and pull over if it starts to get too hot.