Some medical disorders may interact with generic Aralen. Tell your local doctor if you are pregnant, planning to become pregnant, or are breast-feeding, if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement, if you have allergies to medicines or other substances, if you have porphyria or any other blood disease, glucose-6-phosphate dehydrogenase (G-6-PD) deficiency, or a history of seizures, if you have psoriasis, stomach or intestinal problems, liver disease, or central nervous system problems. Some medicines may interact with Aralen, including Cimetidine or quinacrine, Ampicillin, rabies vaccine, or thyroid hormones, Arsenic, astemizole, cisapride, dofetilide, or terfenadine or Cyclosporine because its side effects may be increased. This may not be a full list of all interactions that may take place. When you buy Aralen, ask your local doctor if it may interact with other medicines that you take. Check with your local doctor before you start, stop, or change the dose of any medicine.