Drugs that may Cause False-Positive Reactions in Autoantibody Tests*
| Antibiotics | Para-aminosalicylic acid |
| Anti-DNA | Penicillin |
| Chlorpromazine | Phenylbutazone |
| Clofibrate | Phenytoin |
| Ethosuximide | Procainamide |
| Griseofulvin | Propylthiouracil |
| Hydralazine | Quinidine |
| Isoniazid | Radioactive diagnostics |
| Mephenytoin | Streptomycin |
| Methyldopa | Sulfonamides |
| Methysergide | Tetracyclines |
| Oral contraceptives | Trimethadione |
* The drugs listed here may cause false-positive reactions in the following tests: antinuclear antibodies, lupus erythematosus cell test, and antiglobulin (Coombs') tests.