Fosphenytoin (Injection) (Cerebyx) - Drugs Information, Side Effects, & Interactions

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Fosphenytoin (FOS-fen-i-toyn)

Treats different types of seizures (epilepsy). Belongs to a class of drugs called anticonvulsants.

Cerebyx
There may be other brand names for this medicine.

You should not use this medicine if you have had an allergic reaction to fosphenytoin or phenytoin in the past.

Injectable

Fosphenytoin is given only for a short time when you cannot take other forms of anticonvulsant medicine, such as when you are in the hospital or having surgery.
An IM injection is a shot given in your muscle (upper arm, thigh, buttocks). An IV infusion is a bag of medicine connected to a long tube with a needle on the end of it. The needle is placed in your vein, usually on the back of your hand or wrist, or inside your elbow. The medicine slowly drips from the bag through the tube and into your vein.
Your doctor will prescribe the amount of medicine you should have and when it will be given.
A nurse or other caregiver will give you the injections.
Sometimes you or a family member may be trained to give your shots at home.

If a dose is missed:

Take the missed dose as soon as possible.
If it is almost time for your next regular dose, wait until then to take your medicine and skip the missed dose.
You should not use two doses at the same time, unless directed by your doctor.
If you miss two or more doses, call your doctor.

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

Avoid drinking alcohol.
Talk to your doctor if you are also taking birth control pills. Your dose may need to be changed or you may need to use another kind of birth control.
Make sure your doctor knows if you are also taking any of these medicines: cimetidine (Tagamet®); Cordarone®, disulfiram (Antabuse®); Coumadin®, Prozac® or other medicine for depression; diabetes medicine (pills, not insulin); other seizure medicine such as Tegretol®, phenobarbital, or Klonopin®.

Check with your doctor before using fosphenytoin if you are pregnant or breastfeeding, or if you have heart problems, high blood pressure, liver or kidney disease, or a blood disorder.
Because of the risk of increased seizures, do not suddenly stop taking this medicine without first checking with your doctor.
This medicine may cause drowsiness. Be careful when driving or using dangerous machinery.
Brush your teeth, use dental floss, and see a dentist on a regular basis. All of these things can help avoid gum bleeding or enlargement.

Call your doctor right away if you notice any of these side effects:

If you notice these less serious side effects, talk with your doctor:

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