Dizziness, lightheadedness, or tiredness may occur as the body adjusts to the medication. Diarrhea, stomach/abdominal pain, decreased appetite, vomiting, trouble sleeping, and unusual dreams may also occur. If any of these effects last or get worse, tell the doctor or pharmacist promptly.

This drug may reduce blood flow to the hands and feet, causing them to feel cold. Tell the doctor if this occurs. Dress your child warmly.

Remember that this medication has been prescribed because the doctor has judged that the benefit to your child is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell the doctor right away if your child has any serious side effects, including: fainting, pale/blue/purple skin, new or worsening symptoms of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain), very slow heartbeat, irregular heartbeat, signs of infection (such as sore throat that doesn't go away, fever, chills), mental/mood changes (such as agitation).

This product may cause low blood sugar (hypoglycemia), especially if your child is sick, not eating regularly, or is vomiting. Symptoms of low blood sugar include sudden sweating, shaking, fast heartbeat, hunger, blurred vision, dizziness, seizures, or weakness. This product may prevent some of the symptoms of hypoglycemia (such as fast/pounding heartbeat). Other symptoms of low blood sugar, such as dizziness and sweating, are not affected by this drug. If your child has symptoms of hypoglycemia, tell the doctor right away.

This medication may increase the risk of stroke in certain children with a large hemangioma on their face or head. Get medical help right away if your child has symptoms of a stroke, including: trouble speaking, weakness on one side of the body, sudden vision changes, confusion.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.