"A new consumer-friendly form ( is now available for making reports to MedWatch, the Food and Drug Administration's (FDA) on-line system for collecting information about serious problems with drugs, medical devices and other FDA-"...
(Generic versions may still be available.)
Gantanol Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Gantanol (sulfamethoxazole) is an antibacterial sulfonamide used to treat urinary tract infections (UTIs), meningitis, ear infections, and eye infections. The brand name of this medication is discontinued, but generic versions may be available. Common side effects include dizziness, headache, lethargy, diarrhea, anorexia, nausea, vomiting, and rash.
To treat severe Infections the dose of Gantanol is 4 tablets (2 g) initially, followed by 2 tablets (1 g) three times daily thereafter. Gantanol may interact with diuretics, anticoagulants, phenytoin, or methotrexate. Tell your doctor all medications and supplements you use. During pregnancy, Gantanol should be used only if prescribed. This drug passes into breast milk. Breastfeeding is not recommended while using this drug.
Our Gantanol (sulfamethoxazole) 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.
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Gantanol FDA Prescribing Information: Side Effects
Included in the listing that follows are adverse reactions that have not been reported with this specific drug; however, the pharmacologic similarities among the sulfonamides require that each of the reactions be considered with Gantanol (sulfamethoxazole) administration.
Allergic Reactions: Anaphylaxis, allergic myocarditis, serum sickness, conjunctival and scleral injection, generalized allergic reactions. In addition, periarteritis nodosa and systemic lupus erythematosus have been reported.
Endocrine: The sulfonamides bear certain chemical similarities to some goitrogens, diuretics (acetazolamide and the thiazides) and oral hypoglycemic agents. Cross-sensitivity may exist with these agents. Diuresis and hypoglycemia have occurred rarely in patients receiving sulfonamides.
Read the entire FDA prescribing information for Gantanol (Sulfamethoxazole) »
Additional Gantanol Information
- Gantanol Drug Interactions Center: sulfamethoxazole oral
- Gantanol Side Effects Center
- Gantanol FDA Approved Prescribing Information including Dosage
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.
Find out what women really need.