Symptoms of concussion are usually temporary and resolve in a few days. Sometimes, post-concussion syndrome can develop which means that symptoms linger, for example headaches or dizziness, possibly with an associated low mood.
In this case, appropriate homeopathic remedies can be prescribed which often help to resolve these symptoms in a relatively short space of time.
Of course, it would be hugely beneficial to take a remedy immediately after a sustained concussion so that the symptoms resolve speedily without going into post-concussion syndrome.
If you are affected by brain injury, see also my facebook group "Brain Injury - Restoring Your Health"