Keisha Barnes was driving a white Mini Cooper on the A259 at Colworth near the town.
She lost control while driving southbound and later told officers she must have fallen asleep at the wheel.
The 39-year-old veered into oncoming traffic and collided with a Toyota Verso taxi driving northbound.
Barnes had taken cocaine earlier in the night, and the collision caused serious life changing injuries to her passenger.
Drug driving is one of the main causes of people being killed or seriously injured on our roads.
At Lewes Crown Court on March 13 she admitted causing serious injuries by dangerous driving.
In a victim personal statement her passenger warned her: “If you keep doing what you are doing, then you will hurt more people and ruin other people’s lives.”
Barnes, unemployed of Queen Street, Littlehampton, was jailed for two years and six months.
She was disqualified from driving for four years and three months and must take an extended retest.
The court heard how the incident happened at 1.50am on April 30 last year.
Barnes was herself injured in the collision and also needed surgery.
The fire service had to use specialist equipment to free her and the passenger from the wreckage of the collision.
A blood test showed she had 35 microgrammes (ug) of cocaine per litre of blood in her body. The legal limit is 10ug of cocaine per litre of blood.
Detective Constable Kelly Newton from the Serious Collision Investigation Unit said: “Barnes’ actions that night were reckless and selfish.
“She lost control of her vehicle after consuming drug, veering into an oncoming vehicle which gave the other driver no time to react.
“This case demonstrates how drug-driving poses a serious risk to the safety of all road users, including the driver themselves.
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