If you are taking this medication on a regular schedule and miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.

If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe drowsiness. In children, mental/mood changes (such as restlessness, agitation) may occur before drowsiness.

• If you are taking the over-the-counter product to self-treat, read and follow all directions on the product package before taking this medication
• If you have any questions, consult your pharmacist
• If your doctor has prescribed this medication, take it as directed
• This medication is taken by mouth with or without food, usually once daily in the evening
• If you are using the liquid form of this medication, measure the dose carefully using a special measuring device/spoon
• Do not use a household spoon because you may not get the correct dose
• The dosage is based on your age, medical condition, and response to treatment
• Do not increase your dose or take this medication more often than directed
• If your condition does not get better or if it gets worse, or if you think you may have a serious medical problem, get medical help right away.