After a first impaired driving (DUI) charge, does a person lose their driver's licence?

Impaired driving charges usually involve two separate things: a licence suspension and the criminal court process. In Ontario, police typically issue an immediate roadside licence suspension at the time of the incident, and there can also be a separate suspension tied to the criminal charge itself, which the court decides on later depending on how the case proceeds. The two run on different tracks: the court deals with the criminal charge, and the provincial transportation authority deals separately with the administrative side, including what has to happen before a licence can be reinstated. Whether a licence is affected long-term, and for how long, depends on the specific circumstances, the exact charge, and how the case moves through court. This isn't something that can be answered in general terms for a specific person's situation. That's the kind of thing only the lawyer can answer for your situation — the office goes through it with you on the call.