Thioridazine

THIORIDAZINE HYDROCHLORIDE
(thioridazine hydrochloride) Tablet, Film Coated 10 mg, 25 mg, 50 mg and 100 mg

WARNING

THIORIDAZINE HAS BEEN SHOWN TO PROLONG THE QTc INTERVAL IN A DOSE RELATED MANNER, AND DRUGS WITH THIS POTENTIAL, INCLUDING THIORIDAZINE, HAVE BEEN ASSOCIATED WITH TORSADE DE POINTES-TYPE ARRHYTHMIAS AND SUDDEN DEATH. DUE TO ITS POTENTIAL FOR SIGNIFICANT, POSSIBLY LIFE-THREATENING, PROARRHYTHMIC EFFECTS, THIORIDAZINE SHOULD BE RESERVED FOR USE IN THE TREATMENT OF SCHIZOPHRENIC PATIENTS WHO FAIL TO SHOW AN ACCEPTABLE RESPONSE TO ADEQUATE COURSES OF TREATMENT WITH OTHER ANTIPSYCHOTIC DRUGS, EITHER BECAUSE OF INSUFFICIENT EFFECTIVENESS OR THE INABILITY TO ACHIEVE AN EFFECTIVE DOSE DUE TO INTOLERABLE ADVERSE EFFECTS FROM THOSE DRUGS. (SEE WARNINGS, CONTRAINDICATIONS, AND INDICATIONS).

DRUG DESCRIPTION

Thioridazine hydrochloride is 2-methylmercapto-10-[2-(N-methyl-2-piperidyl) ethyl] phenothiazine. Its structural formula, molecular weight and molecular formula are:

Thioridazine Hydrochloride Structural Formula Illustration

C21H26N2S2•HCl..................M.Wt.: 407.05

Thioridazine hydrochloride is available as tablets for oral administration containing 10 mg, 25 mg, 50 mg or 100 mg. Each tablet for oral administration contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, hydroxypropyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, sodium lauryl sulfate, titanium dioxide and FD&C Yellow #6 Aluminum Lake.

What are the possible side effects of thioridazine (Mellaril)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using thioridazine and call your doctor at once if you have a serious side effect such as:

  • headache with chest pain and severe dizziness, fainting, fast or pounding heartbeats;
  • slow heart rate, weak pulse, fainting, slow breathing;
  • very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, feeling like you might pass out;
  • twitching or uncontrollable...

Read All Potential Side Effects and See Pictures of Thioridazine »

What are the precautions when taking thioridazine (Thioridazine)?

Before taking thioridazine, tell your doctor or pharmacist if you are allergic to it; or to other phenothiazines (e.g., chlorpromazine); 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.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: a certain severe nervous system problem (severe CNS depression), severe blood pressure problems.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: certain blood problems (e.g., low white blood cell count), Parkinson's disease, history of seizures, low enzymes needed to...

Read All Potential Precautions of Thioridazine »

Last reviewed on RxList: 5/5/2009
This monograph has been modified to include the generic and brand name in many instances.

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Report Problems to the Food and Drug Administration

 

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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