As a chapter in the British National Formulary this is a fairly small section which covers some of the following areas: different types of anaemia and blood disorders, fluids and electrolytes, vitamins and minerals, health supplements and enteral and intravenous nutrition.
An important aspect to bear in mind is that many drugs/drug classes that you will come across will relate back to this topic of blood and nutrition. This is the case a lot of the times due to side effects and monitoring requirements of specific parameters. As a result, you need to recognise and understand the links between different topics.