Police are looking for 16 year old Arianna Jasper.
She was last seen in Des Moines on Friday and needs medication for bi-polar disorder.
She's 5' 10" tall and weights about 150 lbs and could be wearing a red coat with a black lining.
Police say she could be aggressive or suicidal without the medication.
If you see Arianna, please call 9-1-1.