DRUG INTERACTIONS: This drug should not be used with the following medications because very serious interactions may occur: allopurinol, ribavirin. If you are currently using any of these medications, tell your doctor or pharmacist before starting didanosine. Tell your doctor of all prescription and nonprescription drugs you may use, especially of: benzodiazepines (e.g., diazepam, triazolam), delavirdine, drugs that decrease stomach acid (e.g., cimetidine, omeprazole), ganciclovir, protease inhibitors (e.g., indinavir, nelfinavir, ritonavir), tenofovir, methadone, stavudine, zalcitabine, zidovudine. Also, report the use of drugs that may increase the risk of pancreatitis (e.g., pentamidine or sulfonamides such as cotrimoxazole). Consult your doctor or pharmacist. Do not use dapsone, itraconazole, ketoconazole or tetracycline antibiotics within 2 hours of this medication. Separate the timing of doses if you are also taking a quinolone antibiotic (e.g., ciprofloxacin, ofloxacin). Ask your pharmacist for specific instructions on how far apart to take each dose. This medication contains a significant amount of antacid components. Tell your doctor if you are using other antacid products. Food decreases the absorption of this drug. Follow your doctor's advice about food and the use of this drug. Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include tingling, burning, or numbness in hands or feet; diarrhea; yellowing of skin or eyes; dark urine or pale stools; unusual fatigue; or severe stomach pain with nausea or vomiting.

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. Need help identifying pills and medications? Use the pill identifier tool on RxList.