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.
How Ibrutinib Is Given: 1  Ibrutinib is a capsule, taken by mouth once daily. 2  Take ibrutinib at approximately the same time each day. 3  Take ibrutinib exactly as prescribed. 4  Swallow ibrutinib capsules whole with at least 8 ounces of water. 5  Do not change your dose or stop ibrutinib unless your health care provider tells you to.