G-Iron Ferrous Sulfate Tetracycline Hydrochloride
ModerateFerrous sulfate and tetracycline should not be swallowed at the same time. When both are taken by mouth, the body absorbs less of each one, so neither works as well as it should. If you need both, take ferrous sulfate 3 hours before tetracycline, or 2 hours after it.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.