<<Disclaimer: Verify this information before applying it to your situation.>> I recently needed a prescription for Erythromycin and had my pharmacist call to check on its G-F status (I later also called the manufacturer to confirm the info). Abbot Labs assures that all of their Erythromycin is G-F, using a corn binder. They also suggested that consumers check periodically, since formulas can sometimes change. Following is the Abbot Labs 800#, should you have any questions on other medications from this company. I also wasable to obtain the info # for Ross Labs - should you ever want to research one of their products. Abbot Labs - (800) 441-4987 Ross Labs - (800) 227-5767 Nina :) '89FX3/Coupe (SAM)