Stiripentol is used along with clobazam (Onfi®) to control seizures in adults and children 2 years of age and older who have Dravet syndrome (a disorder that begins in early childhood and causes seizures and later may lead to developmental delays and changes in eating, balance, and walking). Stiripentol is in a class of medications called anticonvulsants. It works by decreasing abnormal excitement activity in the brain.

Side Effects Of Stiripentol

Stiripentol may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • sleepiness
  • tiredness
  • problems with coordination
  • uncontrollable shaking of a part of the body
  • loss of muscle tone
  • difficulty speaking
  • drooling
  • nausea
  • vomiting
  • changes in weight
  • joint pain

Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately:

  • cough, sore throat, fever, chills, or other signs of infection
  • unusual bruising or bleeding
  • blood in urine or stools
  • Stiripentol can cause loss of appetite and weight loss. If you notice your child is losing weight, call your doctor. Your doctor will watch your child’s growth carefully. Talk to your doctor if you have concerns about your child’s growth or weight while he or she is taking this medication.

Stiripentol may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

Warnings & Precautions

Before taking stiripentol:

  • tell your doctor and pharmacist if you are allergic to stiripentol, any other medications, or any of the ingredients in stiripentol capsules or oral powder for suspension. Ask your pharmacist or check the Medication Guide for a list of the ingredients.
  • tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: caffeine or medications that contain caffeine (Cafcit, Excedrin, in Cafergot, others); carbamazepine (Carbatrol, Epitol, Equetro, Tegretol, Teril); clopidogrel (Plavix); diazepam (Valium); glyburide (Diabeta, Glynase); methotrexate (Otrexup, Rasuvo, Xatmep); midazolam (Seizalam); phenobarbital; phenytoin (Dilantin, Phenytek); prazosin (Minipress); quinidine (in Nuedexta); rifampin (Rifadin, Rimactane, in Rifamate, in Rifater); sedatives, sleeping pills, or tranquilizers; sertraline (Zoloft); theophylline (Elixophyllin, Theo-24, Theochron); thiotepa (Tepadina); or triazolam (Halcion). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with stiripentol, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
  • also tell your doctor if you have or have ever had depression, mood problems, or suicidal thoughts or behavior, or kidney or liver disease.
  • tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking stiripentol, call your doctor.
  • you should know that stiripentol may make you dizzy or drowsy and may affect your coordination. Do not drive a car or operate machinery until you know how this medication affects you.
  • ask your doctor about the safe use of alcoholic beverages while you are taking stiripentol. Alcohol can make the side effects of stiripentol worse.
  • if you have phenylketonuria (PKU, an inherited condition in which a special diet must be followed to prevent mental retardation), you should know that stiripentol oral powder is sweetened with aspartame that forms phenylalanine.
  • you should know that your mental health may change in unexpected ways and you may become suicidal (thinking about harming or killing yourself or planning or trying to do so) while you are taking stiripentol. A small number of adults and children 5 years of age and older (about 1 in 500 people) who took anticonvulsants, such as stiripentol, to treat various conditions during clinical studies became suicidal during their treatment. Some of these people developed suicidal thoughts and behavior as early as one week after they started taking the medication. You and your doctor will decide whether the risks of taking an anticonvulsant medication are greater than the risks of not taking the medication. You, your family, or your caregiver should call your doctor right away if you experience any of the following symptoms: panic attacks; agitation or restlessness; new or worsening irritability, anxiety, or depression; acting on dangerous impulses; difficulty falling or staying asleep; aggressive, angry, or violent behavior; mania (frenzied, abnormally excited mood); thinking about harming or killing yourself, or planning or trying to do so; or any other unusual changes in behavior or mood. Be sure that your family or caregiver knows which symptoms may be serious so they can call the doctor if you are unable to seek treatment on your own.

Stiripentol Dosage

Stiripentol comes as a capsule and an oral powder for the suspension to take by mouth. It is usually taken two or three times a day during a meal. Take stiripentol at around the same time(s) every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take stiripentol exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Swallow the capsules whole with a glass of water; do not break or open them.

If you are taking the powder, you must mix it with water immediately before taking it. The doctor will tell you how many packets of stiripentol powder to use and how much water to mix it with. Carefully read the manufacturer’s instructions that describe how to mix and take a dose of stiripentol. Be sure to ask your pharmacist or doctor if you have any questions about how to mix or take this medication.

Stiripentol controls your condition but does not cure it. Continue to take stiripentol even if you feel well. Do not stop taking stiripentol without talking to your doctor, even if you experience side effects such as unusual changes in behavior or mood. If you suddenly stop taking stiripentol, your seizures may become worse. Your doctor will probably decrease your dose gradually.


Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your body’s response to Stiripentol.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.


All information has been provided courtesy of MedLinePlus from the National Library of Medicine and from the FDA.