 The semidorphin in Levaldi can cause severe opioid withdrawal that can lead to hospitalization or increased risk of life-threatening overdose. Get emergency help if you have trouble breathing, become very drowsy with slowed or shallow breathing, feel faint, very dizzy, or confused, or have a fever, stiff muscles, rash, swollen glands, or problems with your liver, kidneys, heart, or lungs. Other serious side effects may include high cholesterol, weight gain, potentially fatal high blood sugar, uncontrolled body movements which may be permanent, dizziness upon standing, or falls. Are you ready?