Lamotrigine

Uses of Lamotrigine

Lamotrigine is an anti-epileptic medication, also called an anticonvulsant. Lamotrigine is used alone or with other medications to treat epileptic seizures in adults and children. Lamotrigine is also used to delay mood episodes in adults with bipolar disorder (manic depression).

Precautions and Warnings

Before taking lamotrigine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, liver disease, heart problems (such as irregular heartbeat, heart block, heart failure).

This drug may make you dizzy or drowsy or blur your vision. Alcohol or marijuana (cannabis) can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness or clear vision until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).

Rarely, serious (sometimes fatal) skin rashes have occurred while taking this medication. These rashes are more common in children than in adults. Rashes may be more likely if you start at too high a dose, if you increase your dose too quickly, or if you take this medication with certain other anti-seizure medications (valproic acid, divalproex). These rashes may occur anytime during use, but most serious rashes have occurred within 2 to 8 weeks of starting lamotrigine.

Get medical help right away if you develop any type of skin rash, or if you have other signs of a serious allergic reaction such as hives, fever, swollen lymph nodes, severe dizziness, painful sores in the mouth or around the eyes, swelling of the face/tongue/throat, trouble breathing, or liver problems (symptoms include stomach/abdominal pain, nausea/vomiting that continues, dark urine, yellowing eyes/skin). Your doctor will tell you if you should stop taking lamotrigine. Even after you stop taking this, it is still possible for a rash to become life-threatening or cause permanent scars or other problems.

Dosage

For epilepsy, the usual dose of lamotrigine is:

• adults and older children (aged 12 years and over) – 100mg to 700mg a day, taken as 1 or 2 doses
• younger children (aged 2 to 11 years) – the dose will vary depending on their weight.

For bipolar disorder, the usual dose for adults is between 200mg and 400mg a day, taken as either 1 or 2 doses.

Side Effects

Common Side Effects:

• headache, dizziness;
• blurred vision, double vision;
• tremor, loss of coordination;
• dry mouth, nausea, vomiting, stomach pain, diarrhea;
• fever, sore throat, runny nose;
• drowsiness, tired feeling;
• back pain; or
• sleep problems (insomnia).

Serious Side Effects:

• fast, slow, or pounding heartbeats or fluttering in your chest;
• chest pain, shortness of breath;
• fever, swollen glands, weakness, severe muscle pain;
• any skin rash, especially with blistering or peeling;
• painful sores in your mouth or around your eyes;
• headache, neck stiffness, increased sensitivity to light, nausea, vomiting, confusion, drowsiness;
• jaundice (yellowing of the skin or eyes); or
• pale skin, cold hands and feet, easy bruising, unusual bleeding.