Medication Guide
Carbamazepine (Tegretol, Equetro) Side Effects and Uses
A plain-language guide to Carbamazepine, a mood stabilizer / anticonvulsant. Learn how it helps, what it treats, how to take it and which side effects to know about.
Quick answer. Carbamazepine (Tegretol) is a mood stabilizer / anticonvulsant. Common carbamazepine side effects include dizziness or unsteadiness, sleepiness, nausea or vomiting and blurred or double vision. The rare but serious ones, and when to get help, are listed under carbamazepine side effects below. Never stop or change your dose on your own.
How Carbamazepine Can Help You
Carbamazepine steadies mood by calming nerve cells that fire too much. The slow-release form is Equetro. It is FDA approved for manic and mixed episodes of bipolar I disorder. It is a good option when lithium or valproate has not worked. It also helps when they caused too many side effects. It treats seizures and a face nerve pain called trigeminal neuralgia too.
Mania often starts to ease within one to two weeks of reaching a helpful dose. Fuller gains come after that. Feeling better usually means slower thoughts and better sleep. Your temper no longer flares at every spark.
Carbamazepine speeds up its own breakdown in the first weeks. So your prescriber may need to raise the dose later. That is an expected step. It does not mean the medicine failed.
Uses for Carbamazepine
- Bipolar I mania or mixed episodes (Equetro)
- Bipolar maintenance (off-label)
- Epilepsy and seizures
- Trigeminal neuralgia (face nerve pain)
- Rapid-cycling bipolar disorder (off-label)
How to Take Carbamazepine
Your prescriber decides the form and dose. They adjust it slowly, guided by how you respond and blood levels. Swallow slow-release forms whole. Taking it with food can ease an upset stomach. Avoid grapefruit juice, which raises levels.
Carbamazepine speeds up liver enzymes. So it lowers the levels of many other drugs. Birth control pills are one example, and they may then fail. Every prescriber and pharmacist must know you take it.
Checks include carbamazepine levels and blood counts. Liver tests and sodium levels are checked too. Report any rash, fever, sore throat, mouth sores or easy bruising right away. If you miss a dose, take it when you remember, unless the next dose is near. Never double up. Do not stop on your own.
Carbamazepine Side Effects
Common Side Effects
- Dizziness or unsteadiness
- Sleepiness
- Nausea or vomiting
- Blurred or double vision
- Headache
- Dry mouth
- Mild rash, which must still be reported
- Signs of low sodium, such as tiredness
Serious: Get Medical Help Promptly
- Serious skin reactions, mostly in HLA-B*1502 carriers (boxed warning)
- Big drops in blood cells (boxed warning)
- Very low sodium, causing confusion or seizures
- Liver injury, with yellow skin or dark urine
- New or worse suicidal thoughts (warning for all seizure drugs)
- Birth defects with use in pregnancy
How Carbamazepine Works
Carbamazepine blocks some sodium channels on nerve cells. That calms cells that fire too fast. In bipolar disorder, this is thought to quiet the runaway brain activity behind mania.
Carbamazepine also turns up liver enzymes, including the ones that break it down. That is why its level can drift down in the first weeks. It is also why it changes the levels of many drugs. These range from birth control to some antidepressants and antipsychotics.
Before You Start Carbamazepine
People with some Asian ancestry should have a gene test for HLA-B*1502 before starting. Carriers have a much higher risk of dangerous skin reactions. They usually get a different medicine. Your prescriber will also check blood counts and liver tests at the start.
Tell your prescriber if you have liver disease, heart rhythm problems or glaucoma. Also say if you ever had low blood counts. Share every medicine and supplement. Could you become pregnant? Then talk about birth control that works with carbamazepine. It can cause birth defects and weaken hormone methods.
Like all seizure drugs, it has a warning about new or worse suicidal thoughts. If you are thinking about harming yourself, call or text 988, or call 911. You can learn about bipolar disorder care by telehealth from anywhere in California.
Is Carbamazepine Right for You?
Only a full evaluation with a prescriber can tell you if Carbamazepine fits your symptoms, history and goals. Harpal Singh, PMHNP-BC offers psychiatric evaluations and ongoing medication management by telehealth anywhere in California.
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Related Medication Guides
Other guides in the same group, written the same simple way. Being in one group does not mean you can swap one medicine for another.
- Divalproex sodium (Depakote), mood stabilizer / anticonvulsant
- Lamotrigine (Lamictal), mood stabilizer / anticonvulsant
- Lithium (Lithobid), mood stabilizer
- Oxcarbazepine (Trileptal), anticonvulsant / mood stabilizer (off-label)
FAQ
Questions About Carbamazepine
Why did my prescriber order a genetic test before carbamazepine?
People who carry the HLA-B*1502 gene variant have a much higher risk of severe skin reactions on carbamazepine. It is most common in people with Asian ancestry. A blood test finds carriers, who usually get a different medicine.
Why might my dose need to increase after a few weeks?
Carbamazepine speeds up the liver enzymes that break it down. So blood levels drift down over the first weeks. Prescribers expect this and often adjust the dose at follow-up.
Will carbamazepine affect my birth control?
Yes. It speeds the breakdown of hormones in pills, patches, rings and implants, which can make them fail. If preventing pregnancy matters, talk with your prescriber about methods that are not affected.
What symptoms need an urgent call?
Call right away for any rash, blisters, mouth sores, fever, sore throat, easy bruising or bleeding. Also call for yellow skin, dark urine, confusion or severe tiredness. These can signal rare skin, blood, liver or sodium problems.
How does carbamazepine compare with lithium or Depakote?
It is usually a second-line mood stabilizer. It helps mania and mixed states and sometimes works where others did not, but it has more drug interactions and checks. For some people it is a very good fit.
What is low sodium and how would I notice it?
Carbamazepine can lower the sodium in your blood. Early signs are headache, nausea, tiredness and foggy thinking. A simple blood test checks for it.
Can I drink alcohol while taking carbamazepine?
It is best to avoid alcohol. Alcohol adds to dizziness and sleepiness. Talk with your prescriber about what is safe for you.
Can I stop carbamazepine on my own?
No. Stopping suddenly can bring back mania and can cause seizures in some people. Any change should be slow and planned with your prescriber.