Slideshows Images Quizzes

Copyright © 2018 by RxList Inc. RxList does not provide medical advice, diagnosis or treatment. See additional information.


Last reviewed on RxList: 2/8/2017
Fansidar Side Effects Center

Last reviewed on RxList 01/19/2017

Fansidar (sulfadoxine and pyrimethamine) Tablets is an antiparasitic drug used to treat malaria. Fansidar is available in generic form. Common side effects of Fansidar include:

  • stomach pain,
  • feeling full,
  • hair loss,
  • headache,
  • muscle weakness,
  • depression,
  • nervousness,
  • ringing in your ears,
  • sleep problems (insomnia),
  • diarrhea,
  • dizziness,
  • nausea,
  • vomiting, or
  • loss of appetite.

Tell your doctor if you have serious side effects of Fansidar including:

The recommended dosage of Fansidar is 1 tablet once a week for adults. Dosage for children is based upon body weight. Talk to your doctor about your individual dosage recommendation. Fansidar may interact with other anti-malaria medications, chloroquine, or sulfa drugs. Tell your doctor all medications and supplements you use. Tell your doctor if you are pregnant or plan to become pregnant during treatment with Fansidar; it may harm a fetus. Malaria is more likely to cause death in a pregnant woman. If you are pregnant, talk with your doctor about the risks of traveling to areas where malaria is common. Fansidar is not recommended for use while breastfeeding.

Our Fansidar (sulfadoxine and pyrimethamine) Tablets Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


About how much does an adult human brain weigh? See Answer
Fansidar Consumer Information
SIDE EFFECTS: Consult your pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire patient information overview for Fansidar (Sulfadoxine and Pyrimethamine)


Digestive Disorders: Common Misconceptions See Slideshow
Fansidar Professional Information


For completeness, all major reactions to sulfonamides and to pyrimethamine are included below, even though they may not have been reported with Fansidar (see WARNINGS and PRECAUTIONS: Information For The Patient).

Hematological Changes

Agranulocytosis, aplastic anemia, megaloblastic anemia, thrombocytopenia, leukopenia, hemolytic anemia, purpura, hypoprothrombinemia, methemoglobinemia, and eosinophilia.

Skin and Miscellaneous Sites Allergic Reactions

Erythema multiforme, Stevens-Johnson syndrome, generalized skin eruptions, toxic epidermal necrolysis, urticaria, serum sickness, pruritus, exfoliative dermatitis, anaphylactoid reactions, periorbital edema, conjunctival and scleral injection, photosensitization, arthralgia, allergic myocarditis, slight hair loss, Lyell's syndrome,

Gastrointestinal Reactions

Glossitis, stomatitis, nausea, emesis, abdominal pains, hepatitis, hepatocellular necrosis, diarrhea, pancreatitis, feeling of fullness, and transient rise of liver enzymes.

Central Nervous System Reactions

Headache, peripheral neuritis, mental depression, convulsions, ataxia, hallucinations, tinnitus, vertigo, insomnia, apathy, fatigue, muscle weakness, nervousness, and polyneuritis.

Respiratory Reactions

Pulmonary infiltrates resembling eosinophilic or allergic alveolitis.


Renal failure, interstitial nephritis, BUN and serum creatinine elevation, toxic nephrosis with oliguria and anuria, and crystalluria.

Miscellaneous Reactions

Drug fever, chills, periarteritis nodosa and LE phenomenon have occurred.

The sulfonamides bear certain chemical similarities to some goitrogens, diuretics (acetazolamide and the thiazides), and oral hypoglycemic agents. Diuresis and hypoglycemia have occurred rarely in patients receiving sulfonamides. Cross-sensitivity may exist with these agents. Rats appear to be especially susceptible to the goitrogenic effects of sulfonamides, and long-term administration has produced thyroid malignancies in the species.

Read the entire FDA prescribing information for Fansidar (Sulfadoxine and Pyrimethamine)

Related Resources for Fansidar

Related Drugs

Read the Fansidar User Reviews »

© Fansidar Patient Information is supplied by Cerner Multum, Inc. and Fansidar Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.


About how much does an adult human brain weigh? See Answer

Health Solutions From Our Sponsors