Common symptoms include: 1  Pain in your neck. 2  Headaches. 3  Pain in your shoulder, arm, or hand.  Reduced range of motion in your 1  neck. Numbness, weakness, and slower reflexes in your arms, hands,legs, or feet.  Problems walking including a spastic 1  gait. Muscle weakness in your  legs.
Efavirenz can cause side effects such as mood or behavior changes. These symptoms may improve the longer you take the medication. Taking efavirenz at bedtime may also lessen these effects. Contact your doctor if you have more serious symptoms such as severe depression or thoughts of hurting yourself.isit your doctor regularly. This medication can cause you to have a false positive drug-screening test. If you provide a urine sample for drug-screening, tell the laboratory staff that you are taking efavirenz. Store at room temperature away from moisture and heat.
1 Your child should take Vyvanse (lisdexamfetamine dimesylate) once a day in the morning exactly as the doctor tells him or her to take it. 2  The doctor may change the dose until finding the dose that is right for your child.ith 7 dosage strengths of Vyvanse, the doctor has the flexibility to customize treatment, to provide your child with symptom control and manage side effects. Have your child take Vyvanse exactly as prescribed by the doctor. See additional dosing information below.