Antithyroid drugs (thionamides) | Methimazole | Carbimazole | Propylthiouracil | Anti-inflammatory drugs | Sulfasalazine | Nonsteroidal anti-inflammatory drugs | Gold salts | Leflunomide | Methotrexate | Penicillamine | Phenylbutazone | Antipyrine | Dipyrone | Phenacetin | Psychotropic drugs | Clozapine | Phenothiazines | Tricyclic and tetracyclic antidepressants | Meprobamate Cocaine/heroin (adulterated with levamisole) | Gastrointestinal drugs | Sulfasalazine | Histamine type 2 receptor antagonists | Cardiovascular drugs | Antiarrhythmic agents (tocainide, procainamide, flecainide) | Ticlopidine | ACE inhibitors (enalapril, captopril) | Propranolol | Dipyridamole | Digoxin | Dermatologic drugs | Dapsone | Isotretinoin | Miscellaneous | Chlorpheniramine | | Antibiotics | Macrolides | Trimethoprim-sulfamethoxazole | Chloramphenicol | Sulfonamides | Semisynthetic penicillins | Vancomycin | Cephalosporins | Dapsone | Antimalarial drugs | Amodiaquine | Chloroquine | Hydroxychloroquine | Quinine | Antifungal agents | Amphotericin B | Flucytosine | Antiviral agents | Oseltamivir | Ganciclovir | Acyclovir | Antiseizure medications | Carbamazepine | Phenytoin | Ethosuximide | Valproate | Diuretics | Thiazides | Acetazolamide | Furosemide | Spironolactone | Sulfonylureas | Chlorpropamide | Tolbutamide | Iron chelating agents | Deferiprone | |