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Ziprasidone
Brand Name: Geodon
Overview
Geodon is the brand name for ziprasidone, an antipsychotic used to treat schizophrenia.
It is an atypical (newer) antipsychotic whose structure is different than that of older
antipsychotics. Geodon is somewhat similar to the antipsychotics Seroquel, Risperdal,
Clozaril, and Zyprexa. Geodon helps block the action of serotonin and dopamine and
moderately inhibits reuptake of serotonin and norepinephrine. Unlike most antipsychotics,
Geodon is not associated with significant weight gain.
Geodon was FDA approved for schizophrenia in February 2001.
Why
is this drug prescribed?
Geodon is used to treat both positive and negative symptoms of schizophrenia. Positive
symptoms include hallucinations and delusions, while negative symptoms can include social
withdrawal and apathy. Although not FDA approved for bipolar disorder, it is often used to
treat mania in adults and children.
Warnings
and Precautions
In the past, Geodon was associated with a risk of a heart rhythm irregularity by increasing
the QTc interval (on an EKG). Several studies since then have shown that the risk of this is
very slight and comparable to the risk from other antipsychotics, but it is a factor that
must be considered by doctors and patients. Patients should have an EKG performed before
starting Geodon to rule out underlying cardiac problems.
Geodon may impair the ability to drive or concentrate, especially at the beginning of
therapy. Patients should not drive until Geodon’s effects are known.
Geodon slightly increases a patient’s risk of seizures, particularly in patients over 65.
For Pregnant or Nursing Mothers: Geodon causes fetal problems in animals, and is likely
to do so in pregnant women. It is not known whether Geodon passes into breast milk, but
breastfeeding while taking Geodon is not recommended.
Contraindications
Geodon should Not be used for people with the following medical conditions:
- Taking any medication that affects the QT-interval of the heart rhythm (see examples below).
Precautions
Geodon may be used with caution in people with the following conditions:
- Heart disease or a history of heart disease, or even a family history of heart disease – the risk of heart rhythm side effects may be greater.
- Prone to fainting or dizziness
- Liver disease
- Taking other medications that affect the central nervous system (CNS).
Adverse
Reactions
Geodon may cause the following reactions:
- Tiredness or fatigue
- Headache
- Cough and runny nose
- Nausea
- Constipation
- Dizziness, especially upon standing
- Restlessness
- Diarrhea
- Constipation
- Dry mouth
- Nausea
- Rash
- Vision problems
- Indigestion
- Abnormal muscle movements such as a tremor, shuffling, or uncontrollable movements
- Slowed heartbeat
Geodon, along with other antipsychotics, is associated with a slight risk for Tardive
Dyskinesia (TD). Geodon is believed to have a lower risk for TD than older antipsychotics.
Symptoms of TD are grimacing, sucking and lip smacking, and other abnormal movements of
the body or limbs, and should be reported to a doctor. Risk of TD is highest in older
women.
Geodon is associated with a slight risk of heart rhythm problems. Symptoms of this
include dizziness, fainting, and palpitations, and should be reported to a doctor.
Interactions
with Drugs and Other Substances
Drugs or substances that may interact with Geodon include:
- Drugs that affect the QT-interval of the heart rhythm such as Mellaril (thioridazine), Quinidex (quinidine), Avelox (moxifloxacan), Orap (pimozide), Tikosyn (dofetilide), Betapace (Sotalol), and Zagam (sparfloxacin) – these medications should not be taken with Geodon because they increase the risk of developing heart rhythm problems significantly.
- Diuretics such as water pills: these can also increase the risk of heart rhythm problems.
- Blood pressure medications.
- Any drug that affects the central nervous system (CNS): extra caution is needed when combining drugs that affect the CNS such as tranquilizers, sedatives, and antidepressants.
- Tegretol (carbamazepine): may decrease the effects of Geodon.
Sources
http://www.nami.org/helpline/geodon.htm
http://www.nami.org/update/20010212.html
http://www.healthsquare.com/newrx/GEO1590.HTM
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