What is the suggested preventitive and treatment for drop foot?

ESI or AFO can help. Many factors can contribute in drop foot. It is a condition that affects the peripheral nerves a back injury resulting in compression of a nerve can result in drop foot. Epidural steroid injections can decrease the inflammation around the nerve, thereby alleviating the resultant drop foot. If permanent nerve damage has occurred, an ankle foot orthosis (afo) is helping to aid in ambulation.
Depends on cause. Foot drop is generally a manifestation of peripheral nerve disease and it can result from may causes, e.g., vitamin deficiency, lead poisoning, spinal disorders etc. Treatment depends on correcting the underlying cause.
Cause ? Depends on the exact cause of foot drop, duration of foot drop, associated conditions etc.