You can always ask your doctor for more information.
It can be taken as a tablet by mouth, or given intravenously, via a needle into your vein. Your doctor will decide which is the best method for you.
If you need to take iron tablets it is important to take them correctly. A guide to taking iron tablets gives you the right advice on how to do this and how to manage any side effects.
If you require an iron infusion to rapidly replace iron, the fact sheet Intravenous (IV) iron infusions gives you information about this.